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Preparation of Hydrogen

FeS + HCl → A...

Question

$F e S + H C l \to A + B (g)$
Gas B is passed into aq. solution of C to form A. Select correct statement(s) based on the above.

Color of C changes from yellow to very light green

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Gas B turns lead acetate paper black

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A forms deep blue color with

K_{3} [F e (C N)_{6}]

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All the above are true

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Solution

The correct option is D All the above are true
$F e S + 2 H C l \to F e C l_{2} + H_{2} S (g) (A) (B) (a) 2 F e C l_{3} + H_{2} S \to 2 F e C l_{2} + 2 H C l + S Y e l l o w g r e e n (b) (C H_{3} C O O)_{2} P b + H_{2} S \to C H_{3} C O O H + P b S (B) B l a c k (c) F e C l_{2} + K_{3} [F e (C N)_{6}] \to F e_{3} [F e (C N)_{6}]_{2} b l u e$

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