Hydrides of Nitrogen

Q.

$\underset{–}{\text{Assertion}}$ (A): The boiling point of HF is higher than that of $H_{2}O$.
$\underset{–}{\text{Reason}}$ (R): The hydrogen bond strength in HF is lower than that in $H_{2}O$.

1. A is false but R is true

2. A and R are true and R is the correct explanation of A

3. A and R are true and R is not the correct explanation of A

4. A is true, R is false

Q. A tribasic acid releases ____ hydrogen ions​

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

Q. There are some deposits of nitrates and phosphates in earth's crust. Nitrates are more soluble in water. Nitrates are difficult to reduce under the laboratory conditions but microbes do it easily. Ammonia forms large number of complexes with transition metal ions. Hybridisation easily explains the case of sigma donation capability of $N{H}_3$ and $P{H}_3$. Phosphine is a flammable gas and is prepared from white phosphorus.

Among the following, the correct statement is

1. Between $N{H}_3$ and $P{H}_3,N{H}_3$ is a better electron donor because the lone pair of electrons occupies spherical 's' orbital and is less directional
2. Between $N{H}_3$ and $P{H}_3,N{H}_3$ is a better electron donor because the lone pair of electrons occupies $s{p}^3$-orbital and is more directional
3. Between $N{H}_3$ and $P{H}_3,N{H}_3$ is a better electron donor because the lone pair of electrons occupies $s{p}^3$-orbital and is more directional
4. Between $N{H}_3$ and $P{H}_3,N{H}_3$ is a better electron donor because the lone pair of electrons occupies spherical 's' orbital and is less directional