The catalyst used in the Ostwald process for nitric acid manufacture is: MCQ with Answer and Explanation

Explanation:
In electroplating, the electrolyte must contain the ions of the metal to be deposited. To plate silver, a solution of a silver salt, such as silver nitrate (AgNO₃) or silver cyanide, is used. The anode is pure silver, and the cathode is the copper spoon to be plated.

Explanation:
All matter is composed of tiny particles (atoms, molecules, or ions). This is a fundamental concept. Matter may not always be visible (e.g., air). It can change states (solid, liquid, gas). Gases have mass; for example, a filled gas cylinder weighs more than an empty one. The particulate nature of matter explains diffusion, Brownian motion, etc.

Explanation:
Oxidation of ethanol with acidified K₂Cr₂O₇ or KMnO₄ produces ethanoic acid (CH₃COOH). Dehydration gives ethene; hydrogenation adds H₂; fermentation produces ethanol from sugars.