State one observation for the following : Ammonia gas is passed over heated copper [II] oxide.

Identify the substance italicized : The catalyst used to oxidize ammonia.

Study the flowchart given and give balanced equations to represent the reactions A, B and C

$\text{Mg}$3\text{N}2 \xrightarrow{\text{A}} \text{NH}3 \xtofrom[\text{C}]{\text{B}} \text{NH}4\text{Cl}

Copy and complete the following table which refers to the industrial method for preparation of ammonia.