Question

Write balanced chemical equations for each of the following:
(i) Ammonia reacts with Oxygen
(ii) Copper reacts with Nitric acid.
(iii) Lead sulphide reacts with Oxygen

Answer 1

Balanced equation for following reactions are:--

1. Ammonia reacts with oxygen to give to give nitric oxide and water as products, the water is in form of water vapour. The balanced equation is 4NH3(g)+5O2(g)------>4NO(g)+6H2O(g)
2. Nitric acid is a strong oxidising agent and attacks most of the metals like gold, copper, platinum etc. The products depend on concentration of acid. Reaction with copper is  of two types and depend on concentration 3Cu+8HNO3(dilute)------->3Cu(NO3)2+2NO+4H2O                                            Cu+HNO3(concentrated)-------->Cu(NO3)2+2NO2+2H2O
3. Lead sulphide has formula of PbS and is solid black compound reacts with oxygen to give lead oxide and sulphur dioxide gas is evolved.This reaction take place at high temperature of about 1200 to 1500 degree celcius. The reaction is as follow                                                     2PbS(s)+3O2(g)--------->2PbO(s)+2SO2(g)