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Q.

For which of the following reaction, H = E + 2RT ?

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a

N2(g) + O2(g)   2NO(g)

b

NH4HS(s)   NH3(g) + H2S(g)

c

2SO2(g) + O2(g)   2SO3(g)

d

PCl5(g)   PCl3(g) + Cl2(g)

answer is B.

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Detailed Solution

H =E+ngRT NH4HS(s)  NH3(g) +H2S(g) ng =no.of moles of gaseous products -no. of moles of gaseous reactants ng =(1+1)-0=2 H=E +2 RT

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