In which one of the following reactions, the maximum quantity of H₂ gas is produced by the decomposition of 1 g of compound by H₂O/O₂?

Which of the following compounds undergo thermal decomposition?

Reaction between which of the following two reactants will produce hydrogen gas?

Which one of the following processes involves chemical reaction?

Which one of the following is not an oxidation reaction?

Which one of the following compounds is used in 'black and white' photography?