The standard enthalpies of formation of A(NH_3), B(CO_2), C(HI) and D(SO_2) are -46.19 , -393.4,+24.94 and -296.9 ~kJ ~mol^ -1 respectively. The increasing order of their stability is

JIPMER 2014

Exam: JIPMER
Year: 2014
Subject: Chemistry
Chapter: Thermodynamics (C)

JIPMER 2014 · Chemistry · Thermodynamics (C)

The standard enthalpies of formation of A(NH_3), B(CO_2), C(HI) and...

The standard enthalpies of formation of

A\left(\mathrm{NH}_3\right), B\left(\mathrm{CO}_2\right), C(\mathrm{HI})

and

D\left(\mathrm{SO}_2\right)

are -46.19 ,

-393.4,+24.94

and

-296.9 \mathrm{~kJ} \mathrm{~mol}^{-1}

respectively. The increasing order of their stability is The standard enthalpies of formation of A(NH_3), B(CO_2), C(HI) and D(SO_2) are -46.19 , -393.4,+24.94 and -296.9 ~kJ

The standard enthalpies of formation of A(NH_3), B(CO_2), C(HI) and D(SO_2) are -46.19 , -393.4,+24.94 and -296.9 ~kJ

Options

A $B \lt D \lt A \lt C$
B $C \lt A \lt D \lt B$
C $D \lt B \lt C \lt A$
D $A \lt C \lt D \lt B$

Correct answer

B. $C \lt A \lt D \lt B$

Step-by-step solution

Lower the value of standard enthalpy of formation, higher the stability. The increasing order of standard enthalpies of formation of given molecules is The standard enthalpies of formation of A(NH_3), B(CO_2), C(HI) and D(SO_2) are -46.19 , -393.4,+24.94 and -296.9 ~kJ

Thus, the increasing order of stability is

C \lt A \lt D \lt B

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