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

Explanation

Molality m = moles of solute / kg of solvent

For 60% w/w solution, take 100 g solution:

1) Solute: 60 g ethylene glycol C₂H₆O₂  

Molar mass = 2(12) + 6(1) + 2(16) = 62 g/mol  

Moles EG = 60 / 62 ≈ 0.9677 mol

2) Solvent: 40 g water = 0.040 kg

3) Molality

m = 0.9677 mol / 0.040 kg ≈ 24.2 mol/kg

Last verified on 05-06-2026

Explanation

• Propanol and propanone do not obey Raoult’s Law.
• They form a non-ideal solution due to strong intermolecular interactions.
• Hydrogen bonding and polarity differences cause deviation.

Last verified on 05-06-2026

Explanation

• A salt from weak acid + weak base is ammonium carbonate.
• It is formed from carbonic acid (weak acid) and ammonia (weak base).
• Both ions hydrolyze in water.
• So it is a typical weak acid–weak base salt.

Last verified on 05-06-2026

Explanation

Explanation

• Chromatography mainly works on the principle of adsorption.
• Different substances are adsorbed to different extents on a stationary phase.
• This causes separation of components in a mixture.

Last verified on 05-06-2026

Explanation

• Urea acts as an acid when it reacts with ammonia.
• According to Brønsted–Lowry theory, acids donate protons (H⁺).
• Ammonia acts as a base and accepts the proton.
• So urea behaves as a proton donor in this reaction.

Last verified on 05-06-2026

Explanation

• Histamine is produced in the body from amino acids.
• It is formed by decarboxylation of histidine.
• Histamine is responsible for allergic reactions.
• Antihistamines block its effects in the body.

Last verified on 05-06-2026

Explanation

• UV radiation breaks CFC molecules in the atmosphere.
• This produces chlorine radicals (Cl•) and CF₂Cl• radicals.
• Chlorine radicals are responsible for ozone depletion.
• They catalytically destroy ozone molecules in the stratosphere.

Last verified on 05-06-2026