Strong heating of `Hg(NO_(3))_(2)` does not produces

On strong heating Pb(NO_(3))_(2) gives:

On strong heating, AgNO_(3) produces the gases

On strongly heating Pb(NO_(3))_(2) crystals, the gas formed is

Give reason for the following : (a) Formation of NH_(3) from its elemets at constant pressure is accompained by a decrease in volume. (b) Nitric oxide turns in air. (c ) Copper dissolves in HNO_(3) but not in HCI. (d) Pb (NO_(3))_(2) on heating produces a pale yellow gas which on strong heating produces brown gas.

How many moles of mercury will be produced by electrolysing 1.0 M Hg(NO_(3))_(2) solution by a current of 2.0 A when passed for 3 hours ?

Mg (NO_(3))_(2) overset("Heat")(to)

Among the following metals, which does not produce H_(2) gas on reaction with dilute acids? 1. Zn 2. Al 3. Hg 4. Cu