Preparation and Properties of Potassium Oxide

Q. Oxidation number of potassium in $K_{2}O$, $K_2{O}_2$ and $K{O}_2$, respectively, is:

1. $+1$, $+1$ and $+1$
2. $+1$, $+2$ and $+4$
3. $+1$, $+4$ and $+2$
4. $+2$, $+1$ and $+\frac{1}{2}$

Q. Which of the following statements is/are true?

1. $K_{2}O$ has antifluorite structure
2. In $K_{2}O$ crystal, the potassium ions are coordinated to 4 oxide ions
3. In $K_{2}O$ crystal, the oxide ions are coordinated to 8 potassium ions
4. $K_{2}O$ is the simplest oxide of potassium and it is highly reactive

Q. The magnetic moment of $K{O}_2$ at room temperature is ____ BM.

1. 1.41
2. 1.73
3. 2.23
4. 2.64

Q. Which of the following statements is/are true?

1. $K_{2}O$ has antifluorite structure
2. In $K_{2}O$ crystal, the potassium ions are coordinated to 4 oxide ions
3. In $K_{2}O$ crystal, the oxide ions are coordinated to 8 potassium ions
4. $K_{2}O$ is the simplest oxide of potassium and it is highly reactive