Stoichiometry
A chemical process is said to occur under unsteady state, if the

Ratio of streams entering/leaving are independent of time
Flow rates & composition both are time dependent
None of these
Inventory changes do not take place

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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

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

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