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Q.

(NH₄)₂Cr₂O₇ on strong heating gave a neutral gas A which when passed over heated Mg gave a white residue, which on reaction with water gave a colourless gas B that turned alkaline solution of K₂HgI₄ brown. Then

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a

Gas A is N₂

b

Gas B is NH₃

c

gas B is H₂S

d

gas A is O₂

answer is A, B, C.

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Detailed Solution

${({NH}_{4})}_{2} {Cr}_{2} O_{7} \to N_{2} + {Cr}_{2} O_{3} + 4 H_{2} O$

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