Explanation

• In Na₄[Co(C₂O₄)₃], cobalt has coordination number 6.
• Each oxalate (C₂O₄²⁻) is a bidentate ligand.
• Three oxalate ligands provide 6 coordination sites.
• Oxidation state of Co is +3.

Last verified on 05-06-2026

Explanation

• SO₂ is a polar molecule.
• It has a bent (angular) shape which creates dipole moment.
• The dipole moments do not cancel each other.
• Therefore, it shows a net dipole moment (5.33 × 10⁻³⁰ cm given).

Last verified on 05-06-2026

Explanation

Use Graham’s Law of effusion: rate ∝ 1/√M  

And time ∝ √M since time = 1/rate

t₂ / t₁ = √(M₂ / M₁)

Molar mass: He = 4 g/mol, O₂ = 32 g/mol  

t_He = 5 s

t_O₂ = 5 × √(32 / 4) = 5 × √8 = 5 × 2.828 ≈ 14.1 s.

Last verified on 05-06-2026

Explanation

• Cholesteryl benzoate is an example of a liquid crystal.
• It shows properties of both liquids and solids.
• It exhibits ordered molecular arrangement like crystals.
• It changes phases with temperature.

Last verified on 05-06-2026

Explanation

• The free radical substitution reaction of CH₄ with Cl₂ is a zero-order reaction.
• Its rate does not depend on the concentration of reactants under steady conditions.
• The reaction proceeds via chain mechanism (initiation, propagation, termination).
• So overall observed order is zero.

Last verified on 05-06-2026