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Q.

On reaction with dilute $H_{2} {SO}_{4}$ , Which of the following salts will give out a gas that turns an acidified dichromate paper green ?

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a

$N a_{2} C O_{3}$

b

$N a_{2} S$

c

$Z n S O_{3}$

d

$F e S$

answer is B, C, D.

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Detailed Solution

$N a_{2} S + H_{2} S O_{4} \to N a_{2} S O_{4} + H_{2} S ↑ Z n S O_{3} + H_{2} S O_{4} \to Z n S O_{4} + H_{2} O + S O_{2} ↑ F e s + H_{2} S O_{4} \to F e S O_{4} + H_{2} S ↑ H_{2} S, S O_{2} c a n b e r e d u c e d i c h r o m a t e p a p e r t o g r e e n C r^{3 +}$

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