1

AIEEE 2009

MCQ (Single Correct Answer)

+4

-1

On the basis of the following thermochemical data :

($$\Delta _fG^oH^+_{(aq)}$$ = 0)

H

H

The value of enthalpy of formation of OH

($$\Delta _fG^oH^+_{(aq)}$$ = 0)

H

_{2}O(l) $$\to$$ H^{+}(aq) + OH^{-}(aq); $$\Delta H$$ = 57.32 kJH

_{2}(g) + $${1 \over 2} O_2(g) \to$$ H_{2}O(l); $$\Delta H$$ = -286.20 kJThe value of enthalpy of formation of OH

^{−}ion at 25^{o}C is :2

AIEEE 2008

MCQ (Single Correct Answer)

+4

-1

Oxidising power of chlorine in aqueous solution can be determined by the parameters indicated
below:

$${1 \over 2}C{l_2}(g)$$ $$\buildrel {{1 \over 2}{\Delta _{diss}}{H^\Theta }} \over \longrightarrow $$ $$Cl(g)$$ $$\buildrel {{\Delta _{eg}}{H^\Theta }} \over \longrightarrow $$ $$C{l^ - }(g)$$ $$\buildrel {{\Delta _{Hyd}}{H^\Theta }} \over \longrightarrow $$ $$C{l^ - }(aq)$$

(Using the data, $${\Delta _{diss}}H_{C{l_2}}^\Theta $$ = 240 kJ/mol, $${\Delta _{eg}}H_{Cl}^\Theta $$ = -349 kJ/mol, $${\Delta _{hyd}}H_{C{l^ - }}^\Theta $$ = - 381 kJ/mol) will be :

$${1 \over 2}C{l_2}(g)$$ $$\buildrel {{1 \over 2}{\Delta _{diss}}{H^\Theta }} \over \longrightarrow $$ $$Cl(g)$$ $$\buildrel {{\Delta _{eg}}{H^\Theta }} \over \longrightarrow $$ $$C{l^ - }(g)$$ $$\buildrel {{\Delta _{Hyd}}{H^\Theta }} \over \longrightarrow $$ $$C{l^ - }(aq)$$

(Using the data, $${\Delta _{diss}}H_{C{l_2}}^\Theta $$ = 240 kJ/mol, $${\Delta _{eg}}H_{Cl}^\Theta $$ = -349 kJ/mol, $${\Delta _{hyd}}H_{C{l^ - }}^\Theta $$ = - 381 kJ/mol) will be :

3

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 :4

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

Number in Brackets after Paper Indicates No. of Questions

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