A compound having two direct bonds between P and H atoms is:

1. $H_{3}P{O}_2$

2. $H_{3}P{O}_3$

3. $H_{3}P{O}_4$

4. $H_4{P}_2{O}_7$

General behavior of $O_3$ is: 

1. To give electrons
2. To Give $O_2$
3. Reaction with $H_2$
4. To accept electrons

The correct statement among the following is:

Incorrect statement among the following is:

In X- H ----- Y, X, and Y both are electronegative elements. The correct statement among the following is:

Nitrogen form $N_2$, but phosphorous  form $P_2$, it's at a time convert in $P_4$, reason is:

1. Triple bond present between phosphorous atoms. 
2. $\mathrm{p}\mathrm{\pi }-p\mathrm{\pi }$ bonding is weak in phosphorous.
3. $\mathrm{p}\mathrm{\pi }-p\mathrm{\pi }$ bonding is strong in phosphorous.
4. Multiple bonds easily form phosphorous.

NH₃ forms a hydrogen bond but PH₃ does not because:  

Nitrogen exists as a diatomic molecule and phosphorus as P₄ because on moving 

A chemical that depletes the ozone layer is:

1. Sulphur

2. Chlorofluorocarbons (CFCs)

3. Nitrogen

4. Hydrogen

Fluorine forms only one oxoacid, HOF because of -

1. Low electronegativity and small size

2. High electronegativity and small size

3. High electronegativity and big size

4. Low electronegativity and big size