Oxides of Phosphorus

Q. Even though air contains $78\%$ nitrogen, $20\%$ oxygen by volume and formation of $NO$ is thermodynamically feasible, they do not combine to form $NO$. This is because

1. Both O₂ and N₂ are diatomic gases

2. At atmospheric pressure NO formed spontaneously decompose to the elements

3. The formation of NO requires high temperature

4. The partial pressure of oxygen in the atmosphere is very low

Q. White phosphorus burns in a limited supply of air to form Phosphorus trioxide. When this soft white solid is burnt in plentiful supply of air, we get phosphorus __.

Q. White phosphorus burns in a limited supply of air to form a soft white solid. This solid is Phosphorus __.

Q. $P_2{O}_5$ is heated with water to give

1. hypophosphorous acid
2. phosphorous acid
3. hypophosphoric acid
4. orthophosphoric acid.

Q.

It is because of the inability of $n{s}^2$ electrons of the valence shell to participate in bonding that

1. $S{n}^{2+}$ is oxidizing while $P{b}^{2+}$ is reducing

2. $S{n}^{4+}$ is reducing while $P{b}^{4+}$is oxidizing

3. $S{n}^{2+}$ and $P{b}^{2+}$ are both oxidizing and reducing

4. $S{n}^{2+}$ is reducing while $P{b}^{4+}$is oxidizing

Q.

What is destructive distillation? What are the products of destructive distillation of wood?

Q.

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

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

2. A is false but R is true

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

4. A is true, R is false

Q. Select the correct statement for $P_4{O}_{10}$:

1. It has four $s{p}^3$ - hybridized phosphorus atoms
2. It has higher %s - character in P-O bond than in $P_4{O}_6$
3. It has a cage - like structure
4. It has $p\pi -d\pi$ bonding.

Q. $P_4{O}_{10}$ undergoes complete and violent hydrolysis to give __ acid.