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Zinc II Sulphate

Four colourle...

Question

Four colourless salt solutions are placed in separate test tubes and a strip of copper is dipped in each. Which solution finally turns blue?

A

P b (N O_{3})_{2}

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B

A g N O_{3}

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C

Z n (N O_{3})_{2}

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D

C d (N O_{3})_{2}

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Solution

The correct option is C $A g N O_{3}$
(a) $C u + P b {({N O}_{3})}_{2} ⟶ \times$

(b) $C u + 2 A g {N O}_{3} ⟶ C u {({N O}_{3})}_{2} + 2 A g$

(c) $C u + Z n {({N O}_{3})}_{2} ⟶ \times$

(d) $C d {({N O}_{3})}_{2} + C O ⟶ \times$

$C u$ can reduce only $A g$ out of $P b, A g, Z n, C d$ .

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