A polar bond is formed between two atoms of different electronegativity. A polar molecule results when there is only one polar bond, or more than one polar bond within it is not sufficiently symmetrically oriented to cancel the effects of the others.

Select the correct order of boiling point.

Q.

Question 04

Hydrogen bonds are formed in many compounds e.g., $H_{2}O,HF,N{H}_3$. The boiling point of such compounds depends to a extent on the strength of hydrogen bond and the number of hydrogen bonds. The correct decreasing order of the boiling points above compounds is

(a) $HF>H_{2}O>N{H}_3$

(b) $H_{2}O>HF>N{H}_3$

(c) $N{H}_3>HF>H_{2}O$

(d) $N{H}_3>H_{2}O>HF$

Q. Assertion: Polar compounds contains polar bond , it is not necessarily.
Reason: If polar bonds in a molecule are symmetrically arranged, then their polarities will cancel and they will be non polar.

Q. Both ${CO}_2$ and $H_{2}O$ contain polar covalent bonds but ${CO}_2$ is non-polar while $H_{2}O$ is polar because:

Q. The boiling point of $ICl$ is about ${40}^{\circ }C$ higher than $B{r}_2$. This might be because :

Q. Assertion :$H_{2}S$ is more acidic than $H_{2}O$ Reason: $H-S$ bond is more polar than $H-O$ bond