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Assertion: Stannous chloride gives grey precipitate with mercuric chloride, but stannic chloride does not do so.

Reason: Stannous chloride is a powerful oxidising agent which oxidises mercuric chloride to metallic mercury

(a) Both A and R are true and R is the correct explanation of A

(b) Both A and R are true but R is not correct explanation of A

(c) A is true but R is false

(d) A and R are false

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1 Answers

Correct option  (c) A is true but R is false

Explanation:

SnCl2 (stannous chloride) on reaction with mercuric chloride (HgCl2),2oxidises to SnCl4 (stannic chloride)

SnCl2 + 2HgCl2 → SnCl4 + Hg2Cl2

So in this reaction, stanrous chloride is acting as reducing agent that reduces Hg (II) to Hg (I) and then to Hg (0)

SnCl2 + Hg2Cl2 → 2Hg + SnCl4

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