AIPMT 2007 | Thermodynamics Question 50 | Chemistry

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

AIPMT 2006

MCQ (Single Correct Answer)

-1

Assume each reaction is carried out in an open container. For which reaction will $$\Delta $$H = $$\Delta $$E ?

2CO_(g) + O_2(g) $$ \to $$ 2CO_2(g)

H_2(g) + Br_2(g) $$ \to $$ 2HBr_(g)

C_(s) + 2H₂O_(g) $$ \to $$ 2H_2(g) + CO_2(g)

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

AIPMT 2006

MCQ (Single Correct Answer)

-1

Identify the correct statement for change of Gibb's energy for a system ($$\Delta $$G_system) at constant temperature and pressure.

If $$\Delta $$G_system < 0, the process is not spontaneous.

If $$\Delta $$G_system > 0, the process is spontaneous.

If $$\Delta $$G_system = 0, the system has attained equilibrium.

If $$\Delta $$G_system = 0, the system is till moving in a particular direction.

AIPMT 2006

MCQ (Single Correct Answer)

-1

The enthalpy of hydrogenation of cyclohexene is is $$-$$ 119.5 kJ mol^$$-$$1. If resonance energy of benzene is $$-$$ 150.4 kJ mol^$$-$$1, its enthalpy of hydrogenation would be

$$-$$ 358.5 kJ mol^$$-$$1

$$-$$ 508.9 kJ mol^$$-$$1

$$-$$ 208.1 kJ mol^$$-$$1

$$-$$ 269.9 kJ mol^$$-$$1

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