Decomposition of Nitrates

Q.

What is self-reduction?

Q. Cupric oxide when heated to 1100-1200 degree Celsius gives $CuO\to A+O_2$

1. $Cu$
2. No Reaction possible
3. $C{u}_{2}O$
4. $C{u}_2{O}_3$

Q. Metal A does not react with nitric acid but its nitrate salt undergoes thermal decomposition to yield metal oxide. Identify metal A from the options given below. ​

1. Ag​
2. Cu​
3. Au​
4. Zn​

Q.

Which of the below metal nitrate decomposes to give free metal after heating it?

1. $Pb{\left(N{O}_3\right)}_2$
   

2. $Hg{\left(N{O}_3\right)}_2$
   

3. $Al{\left(N{O}_3\right)}_3$
   

4. None