1
AIEEE 2008
MCQ (Single Correct Answer)
+4
-1
Standard entropy of X2, Y2 and XY3 are 60, 40 and 50 JK−1 mol−1 , respectively. For the reaction,
$${1 \over 2} X_2$$ + $${3 \over 2} Y_2 \to$$ XY3, $$\Delta H$$ = -30 kJ, to be at equilibrium, the temperature will be :
A
1250 K
B
500 K
C
750 K
D
1000 K
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 :
A
+152 kJ mol−1
B
−610 kJ mol−1
C
−850 kJ mol−1
D
+120 kJ mol−1
3
AIEEE 2008
MCQ (Single Correct Answer)
+4
-1
Amount of oxalic acid present in a solution can be determined by its titration with $$KMn{O_4}$$ solution in the presence of $${H_2}S{O_4}.$$ The titration gives unsatisfactory result when carried out in the presence of $$HCl,$$ because $$HCl$$ :
A
gets oxidised by oxalic acid to chlorine
B
furnishes $${H^ + }$$ ions in addition to those from oxalic acid
C
reduces permanganate to $$M{n^{2 + }}$$
D
oxaidises oxalic acid to carbon doxide and water
4
AIEEE 2008
MCQ (Single Correct Answer)
+4
-1
The treatment of $$C{H_3}MgX\,\,$$ with $$C{H_3}C \equiv C - H$$ produces
A
$$C{H_3} - CH = C{H_2}$$
B
$$C{H_3}C \equiv C - C{H_3}$$
C
AIEEE 2008 Chemistry - Hydrocarbons Question 133 English Option 3
D
$$C{H_4}$$
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