Preparation of Dioxygen

Q. Which of the following release oxygen on heating at high temperature?

1. All of these
2. 
3. 
4. 

Q. Electrolysis of water gives dioxygen gas - True or False?

1. True
2. False

Q. Finely divided metals and metal oxides on reaction with hydrogen peroxide liberate __ gas.

Q.

Oxygen is not evolved when:

1. Sodium peroxide reacts with water

2. Ammonium nitrate is heated

3. Zinc oxide is treated with $NaOH$

4. Potassium chlorate is heated with $Mn{O}_2$ catalyst.

Q. Which of the following reactions does not produce oxygen ?

1. $O_3+KI+H_{2}O\to$
2. None
3. $H_2{O}_2+C{l}_2\to$
4. $K{O}_2\left(s\right)+C{O}_2\left(g\right)\to$

Q. Apart from $N_{3}O$, which other colourless gas supports combustion?

1. $N{O}_2$
2. $O_2$
3. $N_2{O}_4$
4. $NO$

Q. Answer the following questions:

Q. An inorganic compound liberates oxygen when heated and turns an acid solution of $KI$ brown and decolourises acidified $KMn{O}_4$ solution. The substance is:

1. $H_2{O}_2$
2. $D_{2}O$
3. $KN{O}_3$
4. $Pb(N{O}_3{)}_2$

Q. Which of the following liberates $O_2$ upon hydrolysis?

1. $P{b}_3{O}_4$
2. $K{O}_2$
3. $N{a}_2{O}_2$
4. $L{i}_2{O}_2$

Q. Which of the following element has allotrope which is the primary absorber of UV solar radiation in Earth's atmosphere?

1. Oxygen
2. Argon
3. Carbon
4. Nitrogen
5. Neon