Stoichiometry
The heat capacity of a substance is

Greater for liquid state than for solid state
Lower for liquid state than for gaseous state
Equal for solid and liquid states below melting point
Higher for solid state than for liquid state

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

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