The chemical formula of bleaching powder is: MCQ with Answer and Explanation

Explanation:
Bakelite is a thermosetting plastic (phenol-formaldehyde resin). Once set, it cannot be remolded by heating because its polymer chains are cross-linked. Polyethylene, PVC, and nylon are thermoplastics—they can be repeatedly softened by heat and hardened on cooling. Thermosetting plastics are used for electrical switches, handles, and adhesives. Vulcanized rubber is also thermoset.

Explanation:
A homogeneous catalyst is in the same phase as the reactants. In the esterification of carboxylic acids with alcohols, liquid sulfuric acid (H2SO4) catalyzes the reaction between liquid reactants. Iron, platinum, and nickel are solid catalysts used for gaseous or liquid reactants, making them heterogeneous catalysts.

Explanation:
MnO₂ oxidizes HCl (Cl⁻ to Cl₂) while itself being reduced (Mn⁴⁺ to Mn²⁺). Oxidizing agent (oxidant) accepts electrons and gets reduced. Here, MnO₂ accepts electrons from Cl⁻. HCl is the reducing agent (reductant) as it loses electrons. This reaction was used by Scheele to discover chlorine. Exam tip: The substance reduced is the oxidizing agent; the substance oxidized is the reducing agent.