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Q.

Consider the following reaction between zine and oxygen and choose the correct options out of the options given below :

2Zn(s)+O2(g)2ZnO(s);ΔH=693.8kJmol1

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a

The enthalpy of two moles of ZnO is less than the total enthalpy of two moles of Zn and one mole of oxygen by 693.8 kJ.

b

The enthalpy of two moles of ZnO is more than the total enthalpy of two moles of Zn and one mole of oxygen by, 693.8 kJ.

c

693.8kJmol1 energy is evolved in the reaction.

d

693.8kJmol1 energy is absorbed in the reaction

answer is A, C.

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Detailed Solution

2Zn(s)+O2(g)2ZnO(s)ΔH=693.8kJmol1

This is an exothermic reaction. The enthalpy of reactant is greater than the enthalpy of product.

The enthalpy of two moles of ZnO is less than the total enthalpy of two moles of Zn and one mole of oxygen by 693.8 kJ.

693.8kJmol1 energy is evolved in the reaction.

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