2C2H2(g) + 5O2(g) 4CO2(g) + 2H2O(g) In the reaction, the mass of carbon (IV) oxide produced on burning 78g of ethyne is [C = 12, O = 16, H = 1]

A.

39

B. 352g

C. 264g

D. 156g

View Answer

JAMB 2006

The oxidation state of chlorine in HClO4 is

A. -5

B. -1

C.

1

D.

7 View Answer

JAMB 2004

Metals of the first transition series have special proper ties which are different from those of groups I and II elements because they have partially filled

A. s orbitals

B. p orbitals

C. d orbitals

D. f orbitals

View Answer

JAMB 2003

The commonest feature of the reactions at the anode is that

A. Electrons are consumed

B. Oxidation is involved

C. Ions are reduced

D. Electrode dissolves

View Answer

JAMB 2003

Ethene reacts with hydrogen bromide to give

A. CH2Br2

B. CH3CH2Br

C. C2H2Br2

D. CHBr3

View Answer

JAMB 2003

Which steam is passed over red-hot carbon, the substances produced are

A. Hydrogen and trioxocarbonate(IV) acid

B. Hydrogen, oxygen and carbon(IV) oxide

C. Hydrogen and carbon (II) oxide

D. Hydrogen and carbon (IV) oxide

View Answer

JAMB 2004

One mole of a hydrocarbon contains 36g of carbon and its vapour density is 20. The structure of the hydrocarbon is

A. CH3CH2CH3

B. CH3CH = CH2

C. CH3CH2C = CH

D. CH3C = CH

View Answer

JAMB 2006

Which of he following pairs of substances will react further with oxygen to form a higher oxide

A. SO2 and NO

B. CO2 and H2O

C. CO and CO2

D. NO and H2O

View Answer

JAMB 2006

A noble gas with a high power of fog penetration used in aerodrome beacons is

A. Argon

B. Helium

C. Neon

D. Krypton

View Answer

JAMB 2010

Alloys are best prepared by

A. Electroplating

B. Arc-welding

C. Reducing a mixture of their metallic oxides

D. Cooling a molten mixture of the metals

View Answer

JAMB 2004

A trihydric alkanol is

A. glycerol

B. phenol

C. glycol

D. ethanol

View Answer

JAMB 2001

If an equilibrium reaction has H>0, the reaction will proceed favourably in the forward direction at

A. High temperature

B. Any temperature

C. Low temperature

D. Minimum temperature

View Answer

JAMB 2003

In the electrolysis of brine, the anode is

A. Platinum

B. Copper

C. Zinc

D. Carbon

View Answer

JAMB 2004

The compound that is used as an anaesthetic is

A. CHCI3

B. CH2C2

C. CH3CI

D. CCI4

View Answer

JAMB 2010

A compound contains 31.91% potassium, 28.93% chlorine and the rest oxygen. What is the chemical formular of the compound

A. KCLO3

B. KCLO4

C. KCLO

D. KCLO2

View Answer

JAMB 2002

A liquid that will dissolve fast is

A. Hydrochloric acid

B. Calcium hydroxide

C. Kerosene

D. Water

View Answer

JAMB 2003

The stability of the noble gases is due to the fact that they

A. Have duplet or octet electron configurations

B. Belong to group zero of the periodic table

C. Are volatile in nature

D. Have no electron in their outermost shells

View Answer

JAMB 2010

5SO2(g) + 2KMnO4(aq) + 2H2O(l) ⇌ K2SO4(aq) + 2MnSO4(aq) + 2H2HSO4(aq) In the reaction above, the products give a

A. Colourless solution

B. Purple precipitate

C. Purple solution

D. Colourless precipitate

View Answer

JAMB 2006

Proteins in acid solution undergo

A. Polymerization

B. Substitution

C. Fermentation

D. Hydrolysis

View Answer

JAMB 2001

25cm3 of a gas X contains Zmolecules at 150C and 75mmHg. How many molecules will 25cmm3 of another gas Y contain at the same temperature and pressure

A. 2Y

B. 2Z

C. Z

D. Y

View Answer

JAMB 2001

A charge in the temperature of a saturated solution disturbs the equilibrium between the

A. Dissolved solute and the solvent

B. Solvent and the undissolved solute

C. Dissolved solute and the undissolved solute

D. Dissolved solute and the solution

View Answer

JAMB 2003

Pure solvents are obtained by

A. Distillation

B. Condensation

C. Extraction

D. EvapopraTION

View Answer

JAMB 2001

Water has the ability to dissolve almost all substances because its molecule has a structure with

A. One positive end and one neutral end

B. Two positive ends

C. One positive end and one negative end

D. Two negative ends

View Answer

JAMB 2006

When sugar is dissolved in tea, the reaction is always accompanied by

A. Positive entropy change

B. Negative entropy change

C. No entropy change

D. A minimum entropy change

View Answer

JAMB 2003

When sodium reacts with water, the resulting solution is

A. weakly acdic

B. neutral

C. acidic

D. alkaline

View Answer

JAMB 2001

The type of reaction that is peculiar to benzene is

A. Addition

B. Hydrolysis

C. Polymerization

D. Substitution

View Answer

JAMB 2003

When water boilers are used for a long period of time, the solid substances left behind as scale are

A. Magnesium trioxosilicate (IV) and calcium Tetraoxosulphate(VI)

B. Magnesium trioxosilicate(IV) and rust

C. Clay and magnesium trioxosilicate (IV)

D. clay and rust

View Answer

JAMB 2005

The intermediate product formed when ethanol is progressively oxidized to ethanoic acid with potassium heptaoxodichromate(VI) is

A. Ethanol

B. Methanol

C. Butanal

D. Propanal

View Answer

JAMB 2002

N2(g) + 3H2(g) ⇌ 2NH2(g) Δ H = - 90kJ In the equation above, the yield of ammonia can be decreased by

A. Adding a catalyst

B. Removing ammonia

C. Increasing the pressure

D. Increasing the temperature

View Answer

JAMB 2005

The property of chlorine which causes hydrogen chloride to be more ionic than the chlorine molecule is its

A. Electrovalency

B. Electron affinity

C. Electropositivity

D. Electronegativity

View Answer

JAMB 2004

The produce of the combustion of candle wax are

A. Carbon(IV) oxide and water

B. Oxygen and water

C. Hydrogen and water

D. Carbon(II)oxide an d water

View Answer

JAMB 2006

Which of the following is a physical change

A. Burning kerosene

B. Freezing ice-cream

C. Exposing white phosphorus to air

D. Dissolving calcium in water

View Answer

JAMB 2003

Metalloids are also referred to as

A. Metals

B. Semi-metals

C. Colloids

D. Non-metals

View Answer

JAMB 2005

According to Charles law, the volume of a gas becomes zero at

A. 00C

B. -1000C

C. -2730C

D. -3730C

View Answer

JAMB 2004

The residual solids from the fractional distillation of petroleum are used as

A. Raw materials for the cracking process

B. Fuel for driving tractors

C. Fuel for jet engines

D. Coatings for pipes

View Answer

JAMB 2010

Hydrogen can be displaced form a hot alkaline solution by

A. Fe

B. Cu

C. Ca

D. Sn

View Answer

JAMB 2003

Stainless steel is used for making

A. Tools

B. Coins and medals

C. Moving parts of clocks

D. Magnets

View Answer

JAMB 2010

The gas that is the most dangerous pollutant to humans is

A. Carbon(IV) oxide

B. Nitrogen (II)oxide

C. Hydrogen sulphide

D. Sulphur(IV) oxide

View Answer

JAMB 2005

The sulphide which is insoluble in dilute hydrochloric acid is

A. CuS

B. Na2S

C. FeS

D. ZnS

View Answer

JAMB 2006

When 5.0cm3 of a saturated solution of sugar of molar mass 342g at 400C was evaporated to dryness, 34.2g of dry solid was obtained. The solubility of sugar at 400C is

A. 7.0 mol dm-3

B. 3.5 mol dm-3

C. 2.0 mol dm-3

D. 10.0mol dm-3

View Answer

JAMB 2006

The air around smelting industries is likely to contain

A. CO2, SO3 and H2

B. SO2N2 and CO2

C. H2, SO2 and CO2

D. H2S, CO and N2

View Answer

JAMB 2005

The characteristic colour of the flame shown when a copper salt moistened with concentrated hydrochloric acid on platinum is put on a bunzen burner is

A. Green

B. Lilac

C. Yellow

D. Brick-red

View Answer

JAMB 2006

When 10g of sodium hydroxide is dissolved in 1000cm3 of water, the solution formed is approximately [Na = 23, H = 1, O = 16]

A. 0.01 mol dm-3

B. 0.10 mol dm-3

C. 0.25 mol dm-3

D. 0.50 mol dm-3

View Answer

JAMB 2003

Which of the following is an example of a mixture

A. Blood

B. Sand

C. Washing soda

D. Common salt

View Answer

JAMB 2010

The processes which return carbon(IV) oxide to the atmosphere include

A. Photosynthesis, decay and respiration

B. Photosynthesis, respiration and transpiration

C. Respiration, decay and combustion

D. Ozone, depletion, combustion and decay

View Answer

JAMB 2002

To obtain pure carbon(II) oxide from its mixture with carbon (IV)oxide, the mixture should be

A. Bubbled through concentrated Tetraoxosulphate(VI) acid

B. Bubbled through sodium hydroxide

C. Passed over heated copper(II) oxide

D. Bubbled through water

View Answer

JAMB 2005

P(g) + O(g) ⇌ 3R(s) + S(g) ΔH is negative which of the following will increase the yield of R

A. Using a larger closed vessel

B. Increasing the temperature

C. Removing some S

D. Adding a positive catalyst

View Answer

JAMB 2001

When a crystal was added to the clear solution of its salt, the crystal did not dissolve and the solution remained unchanged. This showed that the solution was

A. Supersaturated

B. Unsaturated

C. Saturated

D. Concentrated

View Answer

JAMB 2006

Which of the following is used to hasten the ripening of fruit

A. Ethanol

B. Ethyne

C. Ethane

D. Ethane

View Answer

JAMB 2010

Equal moles of ethyne and hydrogen iodide react to give

A. CH2 = CH2

B. CH2 = CHI

C. CH2 – CHI

D. CH2 – CI3

View Answer

JAMB 2005

Which of the following shows little or no net reaction when the volume of the system is decreased

A. H2(g) + l2(g) ⇌ 2Hl(g)

B. 2NO2(g) ⇌ N2O4(g)

C. PCl5(g) ⇌ PCl3(g) + Cl2(g)

D. 203(g) ⇌ 3O2(g)

View Answer

JAMB 2004

The pair of organic compounds that are isomers is

A. Benzene and methylbenzene

B. Trichloromethane and Tetrachloromethane

C. Ethanol and propanone

D. But-1-ene and but-2-ene

View Answer

JAMB 2001

The mass of silver deposited when a current of 10A is passed through a solution of silver salt for 4830s is [Ag = 108, F = 96500 Cmol-1]

A. 108.0g

B. 54.0g

C. 27.0g

D. 13.5g

View Answer

JAMB 2004

Elements in the same periodic table have the same

A. Atomic number

B. Chemical properties

C. Physical properties

D. Number of shells

View Answer

JAMB 2010

The process by which atoms are rearranged into different molecular structures in the petroleum refining process is referred to as

A. Catalytic cracking

B. Hydrocracking

C. Polymerization

D. Reforming

View Answer

JAMB 2003

Calculate the volume of 0.5 mol dm-3 H2SO4 that is neutralized by 25cm3 of 0.1 mol dm-3 NaOH

A. 2.5cm3

B. 0.4cm3

C. 0.1cm3

D. 5.0cm3

View Answer

JAMB 2010

Farmlands affected by crude –oil spillage can be decontaminated by

A. Adding acidic solutions

B. Using aerobic bacteria

C. Pouring water on the affected area

D. Burning off the oil from the area

View Answer

JAMB 2003

How many moles of limestone will be required to produce 5.6g of CaO

A. 0.20 mol

B. 1, 12mol

C. 0.10 mol

D. 0.56 mol

View Answer

JAMB 2005

IN which of the following is the oxidation number of sulphur equal to -2

A. H2S

B. SO3

C. S8

D. SO2

View Answer

JAMB 2006

A difference between chemical and physical change is that in a chemical change

A. Heat is supplied

B. A new substance is formed

C. Oxygen is consumed

D. A reversible process occurs

View Answer

JAMB 2006

Catalytic hydrogenation of benzene produces

A. Oil

B. Cyclohexane

C. Cycloexane

D. Margarine

View Answer

JAMB 2001

Which of the following alloys contain iron

A. Steel and permalloy

B. Duralumlin and steel

C. nd Soft Solder a Duralumlin

D. Brass and bronze

View Answer

JAMB 2005

Which of the following has an isomer

A. C4H10

B. C6H6

C. C2H4

D. C2H6

View Answer

JAMB 2006

which of the following chlorides would exhibit the least ionic character

A. AlCl3

B. CaCl2

C. MgCi2

D. LiCl

View Answer

JAMB 2002

What volume of gas is evolved at s.t.p. if 2g of calcium trioxocarbonate(IV) is added to a solution of hydrochloric acid [Ca = 40, C = 12, O = 16, CI = 35.5, H = 1, Molar volume of a gas at s.t.p = 22.4dm3]

A. 112cm3

B. 224cm3

C. 448cm3

D. 224cm3

View Answer

JAMB 2004

Which of the following is used as fuel in miners’ lamp

A. Ethyne

B. Ethane

C. Ethane

D. Ethanol

View Answer

JAMB 2010

An element will readily form an electrovalent compound if its electron configuration is

A. 2,8,8

B. 2,,8,4

C. 2,8,5

D. 2,8,1

View Answer

JAMB 2005

When pure aluminum metal is heated to red hot in the presence of nitrogen gas, the compound formed is

A. AI2N

B. AIN

C. AI2N2

D. AI2N3

View Answer

JAMB 2005

A gas exerts pressure on its container because

A. Some of its molecules are moving faster than others

B. Of the collision of the molecules with each other

C. Of the mass of the molecules of gas

D. The molecules of a gas collide with the walls of the container

View Answer

JAMB 2003

Natural water collected from rivers and ponds contains oxygen, carbon(IV) oxide and

A. Chlorine

B. Hydrogen

C. Sulphur(IV) oxide

D. Nitrogen

View Answer

JAMB 2005

The ores that can be concentrated by flotation are

A. Nitride ores

B. Chloride ores

C. Oxide ores

D. Sulphide ores

View Answer

JAMB 2005

Which of the following ions is acidic

A. K+

B. NO-3

C. S2-

D. H3O+

View Answer

JAMB 2003

Which of the following gases can be collected by the method of downward delivery

A. Chlorine

B. Oxygen

C. Ammonia

D. Hydrogen

View Answer

JAMB 2004

A concentrated solution containing H+, Cu2+, OH- and Cl- was electrolyzed using platinum electrodes. The ion that will be discharged at the cathode is

A. OH-

B. Cl-

C. Cu2+

D. H+

View Answer

JAMB 2005

The colour of methyl orange in alkaline medium is

A. Pink

B. Orange

C. Red

D. Yellow

View Answer

JAMB 2010

H2(g) + Br2(g) → 2BHr(g) The reaction above is carried out at 250C. If Δ H is kJ mol-1 and Δ S is -106J mol-1K-1 the reaction will

A. Proceed spontaneously at lower temperatures

B. Not proceed spontaneously at the given temperature

C. Proceed spontaneously at the given temperature

D. [proceed in the reverse direction at the given temperature

View Answer

JAMB 2006

The metal that liberates hydrogen from cold water in bubbles only is

A. Na

B. K

C. Ca

D. Al

View Answer

JAMB 2003

To a solution of an unknown compound, a little dilute Tetraoxosulphate (IV) acid was added with some freshly prepared (II) Tetraoxosulphate (VI) Solution. The brown ring observed after the addition of a stream of concentrated Tetraoxosulphate (VI) acid confirmed the presence of

A. CI

B. SO

C. NO

D. CO

View Answer

JAMB 2010

An isomer of C5H12 is

A. Butane

B. 2-methylbutane

C. 2-methylprpane

D. 2-ethylbutane

View Answer

JAMB 2004

A particle that contains 9 protons, 10 neutrons and 10electrons is a

A. Neghative ion

B. Positive ion

C. Neutral atom of a non metal

D. Neutral atom of a metal

View Answer

JAMB 2001

The maximum number of electrons in the L shell of an atom is

A.

8

B.

18

C.

32

D.

2 View Answer

JAMB 2010

Which of the following solutions containing only hydroxyl ions will liberate hydrogen gas when reacted with magnesium metal

A. 1.0 x 10-2 mol dm-3

B. 1.0 x 10-4 mol dm -3

C. 1.0 x 10-5 mol dm-3

D. 1.0 x 10-12 mol dm-3

View Answer

JAMB 2002

Environmental pollution is worsened by the release from automobile exhausts of

A. Water vapour

B. Steam

C. Smoke

D. Heavy metals

View Answer

JAMB 2001

ZnO(s) + CO (g) → Zn(s) + CO2 (g).

A. Decomposed

B. Displaced

C. Oxidized

D. Reduced

View Answer

JAMB 2004

What mass of K2CrO4 is required to prepare 250cm3 of 0.020 mol dm-3 solution [K2CrO4 = 194.2g mol-1]

A. 0.97g

B. 9.70g

C. 19.42g

D. 97.10g

View Answer

JAMB 2003

In the industrial production of H2 from natural gas, the CO2 produced along with the H2 is removed by

A. Passing the mixture into lime water

B. Washing under pressure

C. Drying over phosphorous(V)oxide

D. Using ammoniac copper(l) chloride

View Answer

JAMB 2006

Which of the following results in the fall of acid rain

A. Gaseous hydrocarbons

B. Oxide of lead

C. Particulate matter

D. Oxides of sulphur

View Answer

JAMB 2006

Which of the following is used as a rocket fuel

A. CH3COOH

B. H2SO4

C. HCL

D. HNO3

View Answer

JAMB 2010

A characteristic of the alkane family is

A. Addition reaction

B. Elimination reaction

C. Substitution reaction

D. Neutralization reaction

View Answer

JAMB 2004

The noble gases owe their inactivity to

A. Octet configuration

B. Cyclic shape

C. Hexagonal shape

D. Obtuse configuration

View Answer

JAMB 2003

The shape of the hydrocarbon compound CH4 is

A. Square planar

B. Tetrahedral

C. Planar

D. Linear

View Answer

JAMB 2005

A given volume of methane diffuses in 20s. how long will it take the same volume of sulphur(IV) oxide to diffuse under the same conditions [C = 12, H = 1, S = 32, O = 16]

A. 5s

B. 20s

C. 40s

D. 60s

View Answer

JAMB 2004

A consequence of global warming is

A. Air pollution

B. Water pollution

C. Increased humidity

D. Flooding

View Answer

JAMB 2003

Phenolphthalein in acidic solution is

A. Colourless

B. Yellow

C. Red

D. Orange

View Answer

JAMB 2005

Benzene reacts with hydrogen in the presence of nickel catalyst at 1800C to give

A. Toluene

B. Cyclopentane

C. Cyclohexane

D. Xylene

View Answer

JAMB 2010

What is the decrease in volume of air when pyrogallol is shaken with 30.00cm3 of air

A. 15.00cm3

B. 6.00cm3

C. 0.63cm3

D. 0.06cm3

View Answer

JAMB 2001

Chlorine gas is prepared in the laboratory by

A. Adding concentrated hydrochloric acid to solid manganese (IV) oxide

B. Adding concentrated tetraoxosulphate (VI) acid to solid sodium chloride

C. Dropping concentrated hydrochloric acid onto potassium tetraoxomanganate (VII) crystals

D. Oxidizing concentrated hydrochloric acid using potassium heptaoxodichromate (VI) crystals

View Answer

JAMB 2003

In a flame test for calcium, the flame appears

A. Blue when viewed through a blue glass

B. Green when viewed through a blue glass

C. Orange-red when viewed through a blue glass

D. Brick-red when viewed through a blue glass

View Answer

JAMB 2005

Which of these compounds is a normal salt

A. NaHS

B. NaSO4

C. NaHCO3

D. Na2CO3

View Answer

JAMB 2004

100

CO(g) + H2O(g) ⇌ CO2(g) + H2(g) From the reaction above, calculate the standard heat change if the standard enthalpies of formation of CO2 (g), H2O (g) and CO (g) in kJ mol-1 are -394, -242 and -110 respectively.

A. -262 kJ mol-1

B. -42kJ mol-1

C. +42 kJ mol-1

D. +262 kJ mol-1

View Answer

JAMB 2003

101

The addition of 50cm $^3$ of 0.2mold $m^3$ KOH solution will give a solution with resulting PH of?

A.

12.43

B.

6.86

C.

1.57

D.

7.14 View Answer

POST UTME 2023

102

The gas that reacts with ammonia to produce a dense white fume is

A. HCI

B. H $_2$ S

C. N $_2$ H $_4$

D. NO $_2$

View Answer

POST UTME 2023

103

Which of the following acids is not suitable for producing hydrogen gas from metals?

A. H $_3$ P $_4$

B. HNO

C. H $_2$ SO $_4$

D. HCl

View Answer

POST UTME 2023

104

The following are classified as heavy chemicals except

A. C $_2$ H $_5$ OH

B. H $_2$ SO $_4$

C. NaOH

D. AgBr

View Answer

POST UTME 2023

105

When the total heat content of the products is more than that of reactants, the reaction is said to be

A. exothermic

B. endothermic

C. spontaneous

D. none

View Answer

POST UTME 2023

106

Which of the following substances in water causes furring of kettles?

A. CaCO $_3$

B. Na $_2$ CO $_3$

C. Ca(HCO $_3$ ) $_2$

D. CaCl $_2$

View Answer

POST UTME 2023

107

Why is H $_2$ S a gas and H $_2$ O. a liquid at room temperature?

A. H $_2$ S has a higher molar mass

B. H $_2$ O contains hydrogen bonds in its molecules

C. H $_2$ S has acidic properties

D. H $_2$ 0 is a universal solvent

View Answer

POST UTME 2023

108

A gas X diffuses twice as fast as a gas Y under the same conditions. If the relative molecular mass of Y is 112, calculate the relative molecular mass of X

A.

28

B.

14

C.

56

D.

122 View Answer

POST UTME 2023

109

The properties of elements are periodic functions of their

A. mass number

B. atomic number

C. atomic volume

D. atomic radius

View Answer

POST UTME 2023

110

A liquid begins to boil when

A. its vapour pressure is equal to the vapour pressure of its solid at a given temperature

B. . its vapour pressure equal the atmospheric pressure

C. its volume is slightly increased

D. molecules start escaping from its surface

View Answer

POST UTME 2023

111

2NO(e) + 2CO(g) - N2 + 2CO2(g) H = -89.3 KJ. What conditions would favour maximum conversion of nitrogen (Il) oxide and carbon II) oxide in the reaction above?

A. Low temperature and high pressure

B. Low temperature and low pressure

C. High temperature and low pressure

D. high temperature and high pressure

View Answer

POST UTME 2023

112

An alkanoic has a molar mass of 88 gmol!. Derive its molecular formular and hence name the acid

A. Hexanoic acid

B. propanoic acid

C. butanoic acid

D. pentanoic acid

View Answer

POST UTME 2023

113

The following molecules contain hydrogen bonding except

A. hydrogen chloride

B. hydrogen fluoride

C. ammonia

D. ethanoic acid

View Answer

POST UTME 2023

114

Chlorine is produced commercially by

A. electrolysis of dilute HCl

B. electrolysis of brine

C. heating potassium trioxochlorate (V)

D. neutralization of HCl.

View Answer

POST UTME 2023

115

One of these metals is not an alkali metal?

A. K

B. Fr

C. v

D. Rb

View Answer

POST UTME 2023

116

One of these represents the laboratory preparation of hydrogen

A. C+ H $_2$ 0 → CO + H $_2$

B. Zn + 2HCl → ZnCl + H $_2$

C. 2Na + 2H $_2$ 0 → 2NaOH + H $_2$

D. 2Al(s) + 3H $_2$ 0 $_(l)$ → Al $_2$ O $_3$ (s) 3H $_2$ (g)

View Answer

POST UTME 2023

117

When carbon (IV) oxide is bubbled through lime water, the solution becomes milky due to the formation of

A. CaCO

B. Ca(HCO $_3$ ) $_2$

C. CaCl

D. CaSO $_4$

View Answer

POST UTME 2023

118

Which of the following oxides is amphoteric?

A. ZnO

B. CaO

C. Na $_2$ O

D. MgO

View Answer

POST UTME 2023

119

2CHCOOH + Zn → ? The product of this reaction is

A. (CHCOO) $_2$ Zn + Zn

B. CHCOOCH3 + Zn

C. (CHCOO) $_2$ Zn + H $_2$

D. CH,COOH + CH $_2$

View Answer

POST UTME 2023

120

When KOH is used instead of NaOH in the production of soap; it has the following advantages except it gives:

A. harder soap

B. softer soap

C. more soluble soap

D. soap with lower melting point

View Answer

POST UTME 2023

121

A gas with an initial volume of 6.5 dm $^2$ is heated and allowed to expand to 19.5m $^2$ at constant pressure. What is the ratio of the initial absolute temperature to the final absolute temperature?

A. 2:5

B. 4:5

C. 3:8

D. 1:3

View Answer

POST UTME 2022

122

When does a liquid starts boiling?

A. When its volume is sufficiently decreased

B. When its vapour pressure equals the atmospheric pressure

C. When its molecules start escaping from its surface

D. When it is compressed enough

View Answer

POST UTME 2022

123

The oil-drop experiment was performed by

A. J. J. Thompson

B. James Chadwick

C. R. A. Milikan

D. Ernest Rutherford

View Answer

POST UTME 2022

124

In order to silver-plate a metal M, the metal M is the

A. cathode and a direct current is used

B. cathode and an alternating current is used

C. anode and a direct current is used

D. anode and an alternating current is used.

View Answer

POST UTME 2022

125

Which of the following equilibria is shifted to the right as a result of an increase in pressure?

A. 20 $_3$ $_(g)$ → 30 $_2$ $_(g)$

B. PCl $_5$ (g) + PCl $_3$ (s) + Cl $_2$ $_(g)$

C. 2NO $2$ (g) + N $_2$ O $_4$

D. H $_2$ $_(g)$ + I2 $_(g)$ => 2HI(g)

View Answer

POST UTME 2022

126

A gas that will turn orange K2CrO, solution to clear green is

A. sulphur (IV) oxide

B. hydrogen sulphide

C. sulphur (VI) oxide

D. hydrogenchloride

View Answer

POST UTME 2022

127

Which of the following ions will give a white precipitate with aqueous NaOH and soluble in excess of the base?

A. Cu $^{2+}$

B. Zn $^{2+}$

C. Mg $^{2+}$

D. Mg $^{2+}$

View Answer

POST UTME 2022

128

Which of the ions will impart a brick-red colour to a non-luminous Bunsen flame?

A. Ca $^{2+}$

B. Na $^+$

C. Cu $^{2+}$

D. K $^+$

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POST UTME 2022

129

The role of sodium chloride in the preparation of soap is to

A. react with glycerol

B. separate the soap from glycerol

C. purify the soap

D. make the soap less acidic

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POST UTME 2022

130

Which of the following molecules is linear in shape'

A. CH $_4$

B. Cl

C. H $_2$ O

D. NH $_3$

View Answer

POST UTME 2022

Filter chemistry Questions

2C2H2(g) + 5O2(g) 4CO2(g) + 2H2O(g) In the reaction, the mass of carbon (IV) oxide produced on burning 78g of ethyne is [C = 12, O = 16, H = 1]

A.

39

B.

352g

C.

264g

D.

156g

View Answer

The oxidation state of chlorine in HClO4 is

A.

-5

B.

-1

C.

1

D.

7

View Answer

Metals of the first transition series have special proper ties which are different from those of groups I and II elements because they have partially filled

A.

s orbitals

B.

p orbitals

C.

d orbitals

D.

f orbitals

View Answer

The commonest feature of the reactions at the anode is that

A.

Electrons are consumed

B.

Oxidation is involved

C.

Ions are reduced

D.

Electrode dissolves

View Answer

Ethene reacts with hydrogen bromide to give

A.

CH2Br2

B.

CH3CH2Br

C.

C2H2Br2

D.

CHBr3

View Answer

Which steam is passed over red-hot carbon, the substances produced are

A.

Hydrogen and trioxocarbonate(IV) acid

B.

Hydrogen, oxygen and carbon(IV) oxide

C.

Hydrogen and carbon (II) oxide

D.

Hydrogen and carbon (IV) oxide

View Answer

One mole of a hydrocarbon contains 36g of carbon and its vapour density is 20. The structure of the hydrocarbon is

A.

CH3CH2CH3

B.

CH3CH = CH2

C.

CH3CH2C = CH

D.

CH3C = CH

View Answer

Which of he following pairs of substances will react further with oxygen to form a higher oxide

A.

SO2 and NO

B.

CO2 and H2O

C.

CO and CO2

D.

NO and H2O