Explanation

For 2nd order reaction: 1/[A] = kt + 1/[A]₀

Given:

₀ = 0.24 M → 1/[A]₀ = 1/0.24 = 4.167 M⁻¹

k = 8.1 × 10⁻² M⁻¹s⁻¹

t = 29 s → kt = 0.081 × 29 = 2.349 M⁻¹[A]

So 1/[A] = 2.349 + 4.167 = 6.516 M⁻¹

 = 1 / 6.516 ≈ 0.153 M ≈ 0.15 M[A]

Last verified on 05-06-2026

Explanation

In Crystal Field Theory for octahedral complexes:  

The 5 d-orbitals split into 2 sets due to ligands.

t₂g set: dxy, dxz, dyz → stabilized, lower energy  

e_g set: dz², dx²-y² → destabilized, higher energy  

The energy difference between them is called the crystal field splitting energy, denoted Δ₀ or 10Dq.

So gap t₂g → e_g = 10Dq

Last verified on 06-05-2026

Explanation

• When a chemical cell’s voltage becomes zero, the reaction has reached equilibrium.
• At this point, no net electron flow occurs.
• The rates of forward and reverse reactions become equal.
• Hence, no potential difference is produced.

Last verified on 05-06-2026

Explanation

• Natural rubber consists of polymers of isoprene (C₅H₈).
• Isoprene is a five-carbon unsaturated hydrocarbon.
• Natural rubber is chemically known as cis-1,4-polyisoprene.
• It is obtained from the latex of rubber plants.

Last verified on 05-06-2026

Explanation

• Magnetic susceptibility (χ) is measured using both Gouy balance and Faraday balance.
• These instruments determine the magnetic behavior of substances.
• They are commonly used for paramagnetic and diamagnetic materials.

Last verified on 05-06-2026

Explanation

CH₃Br molecular ion peaks come from bromine isotopes.  

Br has 2 stable isotopes: ⁷⁹Br ≈ 50.7% and ⁸¹Br ≈ 49.3% → basically 1:1 ratio

So CH₃Br gives 2 M⁺ peaks:  

1) ¹²C + 3(¹H) + ⁷⁹Br = 12 + 3 + 79 = m/z 94

2) ¹²C + 3(¹H) + ⁸¹Br = 12 + 3 + 81 = m/z 96

Because the isotopes are ~equal in nature, the two peaks are equal size/height.

Last verified on 05-06-2026

Explanation

• At constant volume, ΔE = q.
• No work is done because volume does not change.
• Therefore, all heat supplied changes the internal energy.
• This follows the First Law of Thermodynamics.

Last verified on 05-06-2026

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