1
AIEEE 2003
MCQ (Single Correct Answer)
+4
-1
If at 298 K the bond energies of C - H, C - C, C = C and H - H bonds are respectively 414, 347, 615 and 435 kJ/mol, the value of enthalpy change for the reaction
H2C = CH2(g) + H2(g) $$\to$$ H3C - CH3(g) at 298 K will be :
A
- 250 kJ
B
+ 125 kJ
C
- 125 kJ
D
+ 250 kJ
2
AIEEE 2002
MCQ (Single Correct Answer)
+4
-1
Change Language
If an endothermic reaction is non-spontaneous at freezing point of water and becomes feasible at its boiling point, then :
A
$$\Delta H$$ is -ve, $$\Delta S$$ is +ve
B
$$\Delta H$$ and $$\Delta S$$ are both +ve
C
$$\Delta H$$ and $$\Delta S$$ are both -ve
D
$$\Delta H$$ is +ve, $$\Delta S$$ is -ve
3
AIEEE 2002
MCQ (Single Correct Answer)
+4
-1
Change Language
For the reactions
2C + O2 $$\to$$ 2CO2; $$\Delta H$$ = -393 J
2Zn + O2 $$\to$$ 2ZnO; $$\Delta H$$ = -412 J
A
carbon can oxidise Zn
B
oxidation of carbon is not feasible
C
oxidation of Zn is not feasible
D
Zn can oxidise carbon
4
AIEEE 2002
MCQ (Single Correct Answer)
+4
-1
Change Language
The heat required to raise the temperature of body by 1 K is called :
A
specific heat
B
thermal capacity
C
water equivalent
D
none of these
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