1

AIEEE 2008

MCQ (Single Correct Answer)

+4

-1

Standard entropy of X

$${1 \over 2} X_2$$ + $${3 \over 2} Y_2 \to$$ XY

_{2}, Y_{2}and XY_{3}are 60, 40 and 50 JK^{−1}mol^{−1}, respectively. For the reaction,$${1 \over 2} X_2$$ + $${3 \over 2} Y_2 \to$$ XY

_{3}, $$\Delta H$$ = -30 kJ, to be at equilibrium, the temperature will be :2

AIEEE 2007

MCQ (Single Correct Answer)

+4

-1

In conversion of lime-stone to lime,

CaCO

CaCO

_{3}(s) $$\to$$ CaO(s) + CO_{2}(g) the vales of ∆H° and ∆S° are +179.1 kJ mol−1 and 160.2 J/K respectively at 298 K and 1 bar. Assuming that ∆H° do not change with temperature, temperature above which conversion of limestone to lime will be spontaneous is :3

AIEEE 2007

MCQ (Single Correct Answer)

+4

-1

Identify the correct statement regarding a spontaneous process :

4

AIEEE 2007

MCQ (Single Correct Answer)

+4

-1

Assuming that water vapour is an ideal gas, the internal energy change $$\left( {\Delta U} \right)$$ when $$1$$ mol of water is vapourised at $$1$$ bar pressure and $${100^ \circ }C$$ (Given : molar enthalpy of vapourisation of water at $$1$$ bar and $$373$$ $$K$$ $$ = 41\,kJ\,mo{l^{ - 1}}\,$$

and $$R = 8.3\,J\,mo{l^{ - 1}}\,{K^{ - 1}}$$ )

and $$R = 8.3\,J\,mo{l^{ - 1}}\,{K^{ - 1}}$$ )

Questions Asked from Thermodynamics (MCQ (Single Correct Answer))

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