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Question

The amount of heat evolved when one mole of H2SO4 reacts with two moles of NaOH is:

A
13.7 k cal
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B
More than 13.7 k cal
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C
Less than 13.7 k cal
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D
Cannot say
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Solution

The correct option is B More than 13.7 k cal

H2SO4+2NaOHNa2SO4+2H2O;

One mole of H2SO4 is completely neutralised by the two moles of NaOH.

Gram equivalent = no. of moles×Valency factor

Gram equivalents of H2SO4=1×2=2
Heat evolved in the neutralisation of 1 gm eq. of strong acid=13.7 k cal

Heat evolved in the neutralisation of 2 gm eq. of strong acid=13.7×2 k cal
ΔH=2×(13.7)=27.4 k cal

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