Question

1)Lead nitrate crystals are heated 2)Ammonium dichromate is heated 3)Hydrated copper(II)sulphate is heated 4)Zinc carbonate is heated​

Answer 1

Lead nitrate crystals on strong heating decompose to form lead monoxide, nitrogen dioxide gas and oxygen gas.

Upon heating, ammonium dichromate decomposes to create nitrogen dioxide, water vapour (Water is gaseous in this reaction due to the relatively high reaction temperature

When copper sulphate pentahydrate is heated, it loses water of crystallization as a result of evaporation. - Losing water of crystallization turns hydrated copper sulphate into anhydrous copper sulphate salt. ... On heating, blue coloured copper sulphate crystals become white. Heating turns crystals of CuSO4.

Zinc carbonate on heating decomposes to zinc oxide and carbon dioxide gas. This is similar to the decomposition of limestone (CaCO3CaCO3) to quick lime (CaOCaO) and carbon dioxide.