Stoichiometry
Hess's law of constant heat summation is based on conservation of mass. It deals with

Equilibrium constant
Reaction rate
Changes in heat of reaction
None of these

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

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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

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

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