Compounds and Their Properties

Q. Which of the following is a molecule of compound?

1. $O_3$
2. $N_3$
3. $P_4$
4. ${\mathrm{SO}}_2$

Q.

How many mole of $O_2$ are present in one mole of $S{O}_2$?

Q. The ratio of hydrogen to oxygen atoms, in a water molecule is ___.

1. 1 : 2
2. 2 : 4
3. 2 : 1
4. 1 : 3

Q. Which of the following is a molecule of compound?​

1. ${\text{N}}_2$
2. ${\text{O}}_3$
3. ${\text{P}}_4$
4. ${\text{SO}}_2$