Properties and Reactions of Sodium Peroxide

Q.

To an acidified dichromate solution, Na₂O₂ is added and shaken. What is observed?

1. Bluish-given precipitate

2. Blue colour

3. Copious evolution of oxygen

4. Orange colour changing to green directly

Q.

Sodium acts as as a strong reducing agent. Which of the following reaction/ reactions exemplifies this behaviour.

1. 

2. 

3. 

4. 

Q. It is a pale yellow powder, but on exposure to moisture and $C{O}_2$ it turns to white. What are we talking about?

1. NaOH

2. Na₂O₂

3. Na₂O

4. 

Q. A soft silver-white metal (A) burns with a golden-yellow flame to give a yellow powder (B) which on treatment with water liberates oxygen giving a clear solution (C). The solution, when mixed with $Al$, attacks the metal, liberating a gas (D) and forming a water-soluble compound (E). The metal (A) dissolves in liquid $N{H}_3$ to form a deep blue solution which is a good conductor and an excellent reducing agent. Identify E:

1. $NaOH$
2. $NaAl{O}_2$
3. $Ca(Al{O}_2{)}_2$
4. None of these

Q. A soft silver-white metal (A) burns with a golden-yellow flame to give a yellow powder (B) which on treatment with water liberates oxygen giving a clear solution (C). The solution, when mixed with $Al$, attacks the metal, liberating a gas (D) and forming a water-soluble compound (E). The metal (A) dissolves in liquid $N{H}_3$ to form a deep blue solution which is a good conductor and an excellent reducing agent. Identify (D):

1. $N_2$
2. $C{l}_2$
3. $N{H}_3$
4. $H_2$

Q. A soft silver-white metal 'A' burns with a golden-yellow flame to give a yellow power 'B, ' which on treatment with water gives a clear solution 'C'. The solution placed on $Al$ attacks this metal, liberating a gas 'D' forming a water-soluble compound 'E'. The metal 'A' dissolves in liquid $N{H}_3$ to form a deep-blue solution which is a good conductor and an excellent reducing agent. Identify 'C':

1. $KOH$
2. $Al(OH{)}_3$
3. $NaOH$
4. $LiOH$

Q. 1) $N{a}_2{O}_2\underset{0{}^{o}C}{\overset{Water}{\to }}P+Q$

2) $N{a}_2{O}_2\underset{25{}^{o}C}{\overset{Water}{\to }}P+R\uparrow +S$
Calculate the sum of bond orders between same bonded atoms in Q and R compounds.

Q. Which of the following does not contain the true peroxide ion?

1. $N{a}_2{O}_2$
2. $H_2{O}_2$
3. $Ba{O}_2$
4. $Sr{O}_2$

Q. On combustion in excess of air sodium mainly forms:

1. $Na{O}_3$
2. None
3. $N{a}_{2}O$
4. $N{a}_2{O}_2$

Q. It is a pale yellow powder, but on exposure to moisture and $C{O}_2$ it turns to white. What are we talking about?

1. NaOH

2. Na₂O₂

3. Na₂O

4.