Nature of Bonding

Q. Assertion (A): $H_{2}O$ is a liquid and $H_{2}S$ is a gas at room temperature.
Reason (R): Water molecules are held by H-bonds while in $H_{2}S$ molecules no such interactions are present between the molecules.
[1 Mark]

1. Both A and R are true and R is the correct explanation of A
2. Both A and R are true but R is not the correct explanation of A
3. A is true but R is false
4. A is false and R is true

Q.

Why is dioxygen a gas but sulphur a solid?

Q. At room temperature $H_{2}O$ is a liquid while $H_{2}S$ is a gas, the reason is:

1. Electronegativity of $S$ is greater than $O$
2. Difference in the bond angles of both the molecules
3. Association takes place in $H_{2}O$ due to $H$-bonding while no $H$-bonding in $H_{2}S$
4. $O$ and $S$ belong to different periods

Q. At room temperature $H_{2}O$ is a liquid while $H_{2}S$ is a gas. The reason is:

1. Electronegativity of $O$ is greater than $S$
2. Difference in the bond angles of both the molecules
3. Association takes place in $H_{2}O$ due to $H$-bonding while no $H$-bonding in $H_{2}S$
4. $O$ and $S$ belong to different periods

Q. Which of the following options is true regarding non-polar molecular solids?

1. They have low melting point and are usually in liquid or gaseous state at room temperature and pressure
2. Atoms or molecules are held by weak dispersion forces or London forces
3. They are soft, non-conductors of electricity
4. All of the above

Q. Which of the following is/are correct regarding the physical state of halogens ?

1. Iodine is a solid at room temperature
2. Iodine is a gas at room temperature
3. Bromine is a gas at room temperature
4. Bromine is a liquid at room temperature

Q. Which of the following isomers of phosphorus is thermodynamically most stable?

1. White
2. Red
3. Black
4. Yellow

Q. Why is dioxygen a gas but sulphur a solid?