Which of the following has the minimum bond length?

1. ^{${\mathrm{O}}_2^{-}$}

2. ${\mathrm{O}}_2^{2-}$

3. O₂

4. ^{${\mathrm{O}}_2^{+}$}

In which of the following pairs of molecules/ions, the central atoms have \(\mathrm{sp}^2\) hybridisation?

The correct increasing order of bond angles in the following species is:

The tendency of BF₃, BCl₃, and BBr₃ to behave as Lewis acid decreases in the sequence

1. BCl₃ > BF₃ > BBr₃

2. BBr₃ > BCI₃ > BF₃

3. BBr₃ > BF₃ > BCl₃

4. BF₃ > BCl₃ > BBr₃

Given the following hydrocarbon:

The state of hybridisation of carbons marked 2, 3, 5 and 6 in the following hydrocarbon are, respectively :

1. sp, sp³, sp² and sp³

2. sp³, sp², sp² and sp

3. sp, sp², sp² and sp³

4. sp, sp² sp³ and sp²

What is the dominant intermolecular force on bond that must be overcome in converting

liquid CH₃OH to a gas?

1. Hydrogen bonding

2. Dipole-dipole interaction

3. Covalent bonds

4. London dispersion force

The angular shape of ozone molecule (O₃) consists of

1. 1 sigma and 2 pi bonds

2. 2 sigma and 2 pi bonds

3. 1 sigma and 1 pi bonds

4. 2 sigma and 1 pi bonds

In the hydrocarbon

     CH₃-CH=CH-CH₂-C$\equiv$CH

     6      5     4   3      2    1

The state of hybridisation of carbons 1,3 and 5 are in the following sequence

(1) sp², sp, sp³                       

(2) sp, sp³, sp²

(3) sp, sp², sp³                       

(4) sp³, sp², sp

The correct order of increasing thermal stability of K₂CO₃, MgCO₃, CaCO₃ and BeCO₃ is:
(1) BeCO₃ < MgCO₃ < K₂CO₃ < CaCO₃

(2) BeCO₃ < MgCO₃ < CaCO₃ < K₂CO₃

(3) MgCO₃ < BeCO₃ < CaCO₃ < K₂CO₃

(4) K₂CO₃ < MgCO₃ < CaCO₃ < BeCO₃

Which of the following compounds has a higher hydration energy than the lattice energy?

1. BaSO₄                           

2. MgSO₄

3. CaSO₄                           

4. SrSO₄