The correct order of bond dissociation enthalpy of halogens is :

1. ${\mathrm{Cl}}_2>{\mathrm{F}}_2>{\mathrm{Br}}_2>{\mathrm{I}}_2$

2. ${\mathrm{I}}_2>{\mathrm{Br}}_2>{\mathrm{Cl}}_2>{\mathrm{F}}_2$

3. ${\mathrm{Cl}}_2>{\mathrm{Br}}_2>{\mathrm{F}}_2>{\mathrm{I}}_2$

4. ${\mathrm{F}}_2>{\mathrm{Cl}}_2>{\mathrm{Br}}_2>{\mathrm{I}}_2$

Given below are two statements :

The compound that does not produce nitrogen gas by the thermal decomposition is :

1. Ba(N₃)₂

2. (NH₄)₂Cr₂O₇

3. NH₄NO₂

4. (NH₄)₂SO₄

Among the following allotropic forms of sulphur, the allotropic form paramagnetic in nature is:

The correct statement regarding the dinitrogen among the below is:

The number of $\mathrm{Cl}=\mathrm{O}$ bonds in perchloric acid is:

The reaction of NO with ${\mathrm{N}}_2{\mathrm{O}}_4$ at 250 K gives :

The products obtained when chlorine gas reacts with cold and dilute aqueous NaOH are:
1. Cl^– and ClO^–
2. Cl^– and ClO₂^–
3. ClO^– and ClO₃^–
4. ClO₃^– and ClO₃^–

Among the following oxoacids, the correct decreasing order of acid strength is:

1. ${\mathrm{HClO}}_4>\mathrm{HOCl}>{\mathrm{HClO}}_2>{\mathrm{HClO}}_3$

2. ${\mathrm{HClO}}_4>{\mathrm{HClO}}_3>{\mathrm{HClO}}_2>\mathrm{HOCl}$

3. ${\mathrm{HClO}}_2>{\mathrm{HClO}}_4>{\mathrm{HClO}}_3>\mathrm{HOCl}$

4. $\mathrm{HOCl}>{\mathrm{HClO}}_2>{\mathrm{HClO}}_3>{\mathrm{HClO}}_4$

Which of the following is the wrong statement?

1. Ozone is violet-black in solid-state

2. Ozone is paramagnetic gas

3. ONCl and ONO^–are not isoelectronic

4. O₃ molecule is bent