Stoichiometry
A metal oxide is reduced by heating it in a stream of hydrogen. After complete reduction, it is found that 3.15 gm of the oxide has yielded 1.05 gm of the metal. It may be inferred that the

Equivalent weight of the metal is 8
Equivalent weight of the metal is 4
Atomic weight of the metal is 2
Atomic weight of the metal is 4

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Stoichiometry
Heat of neutralisation of a strong acid and strong base is always a constant value, i.e., 57 KJ/Kg mole. This is because

The strong base and strong acid reacts in aqueous solution
The strong base and strong acid reacts completely
Only OH⁻ and H⁺ ions react in every case
The salt formed does not hydrolyse

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