Properties and Reactions of Sodium Peroxide

Q. Which of the following metal(s) on treatment with NaOH will liberate $H_2$ gas?

1. Zn
2. Sn
3. Al
4. Mg

Q.

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

1. Blue colour

2. Orange colour changing to green directly

3. Copious evolution of oxygen

4. Bluish-given precipitate

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. 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. 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. 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. $H_2$