Q1: Catalyst used in the manufacture of NH₃ by Haber's process is finely divided

ANS:B - iron

The catalyst used in the manufacture of ammonia (NH3) by the Haber process is finely divided iron. The Haber process is a crucial industrial process for the production of ammonia, which is a key component in fertilizers, explosives, and various other chemicals. In the Haber process, nitrogen (N2) from the air and hydrogen (H2) from natural gas or other hydrocarbon sources are reacted under high pressure and temperature in the presence of a catalyst to produce ammonia. The catalyst used in the Haber process is typically composed of finely divided iron, often promoted with small amounts of other metals, such as potassium oxide (K2O) or aluminum oxide (Al2O3), to enhance its activity and selectivity. The iron catalyst facilitates the reaction between nitrogen and hydrogen, allowing them to react to form ammonia at a reasonable rate and under industrially practical conditions.