when a mixture of ammonium chloride and potassium dichromate are heated,a stable colourless gas A was evolved which did not support combustion but magnesium continued to burn in it.the gas reacted with calcium carbide in an electric furnace forming a solid B.the compound B was slowly hydrolysed by water forming an insoluble substance C and the solution of substance D which turn Nessler's reagent brown.Identify A,B,C and D.write the equation involve in it
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When a mixture of ammonium chloride and potassium dichromate was heated a stable colourless gas(A) nitrogen was evolved which did not support combustion but magnesium continued to burn in it
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