Explanation

• SF₆ has F–S–F bond angles of 90° and 180°.
• It has an octahedral geometry.
• Six fluorine atoms are arranged symmetrically around sulfur.
• Adjacent F atoms make 90°, opposite F atoms make 180°.

Last verified on 05-06-2026

Explanation

• Fe³⁺ has the greatest magnetic moment among the given ions.
• Magnetic moment depends on the number of unpaired electrons.
• More unpaired electrons mean stronger paramagnetism.
• Fe³⁺ contains 5 unpaired electrons.

Last verified on 05-06-2026

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