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When a white crystalline compound X is h...

When a white crystalline compound X is heated with `K_(2)Cr_(2)O_(7)` and concentrated `H_(2)SO_(4)` a, a reddish brown gas A is evolved. On passing A into caustic soda solutions, a yelow coloured solution of B is obtained. Neutralizing the solution B with acetic acid and on subsequent addition of lead acetate, a yellow precipitate C is obtained.When X is heated with NaOH solution, a colourless gas is evolved and on passing this gas into `K_(2)HgI_(4)` solution, a reddish brown precipitate D is formed. Identify A,B,C,D and X. Write the equation of the reaction involved.

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