AIPMT 2008 | Thermodynamics Question 48 | Chemistry

AIPMT 2008

MCQ (Single Correct Answer)

-1

For the gas phase reaction,

PCl_5(g) $$\rightleftharpoons$$ PCl_3(g) + Cl_2(g)

which of the following conditions are correct ?

$$\Delta $$H < 0 and $$\Delta $$S < 0

$$\Delta $$H > 0 and $$\Delta $$S < 0

$$\Delta $$H = 0 and $$\Delta $$S < 0

$$\Delta $$H > 0 and $$\Delta $$S > 0

AIPMT 2008

MCQ (Single Correct Answer)

-1

Bond dissociation enthalpy of H₂, Cl₂ and HCl are 434, 242 and 431 kJ mol^$$-$$1 respectively. Enthalpy of formation of HCl is

$$-$$ 93 kJ mol^$$-$$1

245 kJ mol^$$-$$1

93 kJ mol^$$-$$1

$$-$$ 245 kJ mol^$$-$$1

AIPMT 2008

MCQ (Single Correct Answer)

-1

Which of the following are not state functions ?
(I) q + w (II) q
(III) w (IV) H $$-$$ TS

(I), (II) and (III)

(II) and (III)

(I) and (IV)

(II), (III) and (IV)

AIPMT 2007

MCQ (Single Correct Answer)

-1

Given that bond energies of H $$-$$ H and Cl $$-$$ Cl are 430 kJ mol^$$-$$1 and 240 kJ mol^$$-$$1 respectively and $$\Delta $$H_f for HCl is $$-$$ 90 kJ mol^$$-$$1, bond enthalpy of HCl is

380 kJ mol^$$-$$1

425 kJ mol^$$-$$1

245 kJ mol^$$-$$1

290 kJ mol^$$-$$1

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