2022

Chemistry

POST UTME

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 $^+$

Correct Answer:
Ca $^{2+}$

Explanation

Ca $^{2+}$ => brick red
Na $^+$ => golden yellow
K $^+$ => lilac
Cu $^{2+}$ => blue-green

Ca $^{2+}$ => brick red

Na $^+$ => golden yellow

K $^+$ => lilac

Cu $^{2+}$ => blue-green

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2022

Chemistry

POST UTME

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

A.

Ca﻿2+^{2+}2+﻿

B.

Na﻿+^++﻿

C.

Cu2+^{2+}2+﻿

D.

K﻿+^++﻿

Correct Answer: Ca﻿2+^{2+}2+﻿

Explanation

Ca﻿2+^{2+}2+﻿ => brick redNa﻿+^++﻿ => golden yellowK﻿+^++﻿ => lilacCu﻿2+^{2+}2+﻿ => blue-green

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Ca $^{2+}$

Na $^+$

Cu $^{2+}$

K $^+$

Correct Answer:
Ca $^{2+}$

Ca $^{2+}$ => brick red
Na $^+$ => golden yellow
K $^+$ => lilac
Cu $^{2+}$ => blue-green