An orange solid (A) on heating gave a green residue (B), a colourless gas (C ) and water vapours. The dry gas (C ) when passed over heated magnesium, gave a white solid (D) which evolved a gas (E ) on reacting with water. The gas formed dense white fumes with HCl. Identify all the compounds from A to E. Give the reactions involved. The green residue (B) has the formula

An orange solid (A) on heating gave a green residue (B), a colourless

1.	An orange solid (A) on heating gave a green residue (B), a colourless gas (C ) and water vapours. The dry gas (C ) when passed over heated magnesium, gave a white solid (D) which evolved a gas (E ) on reacting with water. The gas formed dense white fumes with HCl. Identify all the compounds from A to E. Give the reactions involved. The green residue (B) has the formula
Answer» `CrO_(5)` `CrO_(3)` `Cr_(2)O_(5)` `CrO_(2)` Solution :`(NH_(4))_(2)underset((A))(Cr_(2)O_(7)) overset("heat")to underset((B))(Cr_(2)O_(3))+underset((C )) (N_(2))+4H_(2)O`