When a white crystalline compound X is heated with K_2Cr_2O_7 and concentrated H_2SO_4 a reddish brown gas A is evolved. On passing A into caustic soda solution, a yellow coloured solution B is obtained. Neutralizing the solution B with acetic acid on subsequent addition of lead acetate, a yellow precipitate C is formed. When X is heated with NaOH solution, a colourless gas is evolved and on passing this gas into K_2HgI_4 , solution, a reddish brown precipitate D is formed. Identify A, B, C, D and X. Write the equations of the reactions involved.

When a white crystalline compound X is heated with K_2Cr_2O_7 and conc

1.	When a white crystalline compound X is heated with K_2Cr_2O_7 and concentrated H_2SO_4 a reddish brown gas A is evolved. On passing A into caustic soda solution, a yellow coloured solution B is obtained. Neutralizing the solution B with acetic acid on subsequent addition of lead acetate, a yellow precipitate C is formed. When X is heated with NaOH solution, a colourless gas is evolved and on passing this gas into K_2HgI_4 , solution, a reddish brown precipitate D is formed. Identify A, B, C, D and X. Write the equations of the reactions involved.
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