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Q.

The diagram illustrates the energy change of a set of reactions.

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            Which of the following statement are correct?

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a

The enthalpy change for the transformation R → Q will be endothermic 

b

The enthalpy change for the reaction P → R is − 33 kJ mol−1

c

The enthalpy change for the transformation  R → Q will be exothermic 

d

The enthalpy change for the transformation S → P will be + 42 kJ  mol−1

answer is C, D.

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Detailed Solution

ΔHPR = ΔHPQ + ΔHQS + ΔHSR = (− 134) + 92 − (-75) kJ mol-1

ΔHRQ = ΔHRS + ΔHSQ = (−75) − (+92) =− 168 kJ mol−1 < 0 Exothermic

ΔHSP = ΔHSQ + ΔHQP

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