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On addition of reactant at equilibrium, equilibrium constant decreases.

Enthalpy of atomisation will always be negative.

One equivalent of a strong acid on reaction with excess of strong base will produce 9 gm water.

Molecularity of individual step in a complex reaction mechanism can be defined.

answer is C.

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Detailed Solution

The sum of the stoichiometric coefficients of the reactants in the chemical equation of the reaction determines the molecularity of the chemical reaction. It can also mean the quantity of reactant molecules involved in a particular reaction step.

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