1
AIEEE 2002
+4
-1
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
2
AIEEE 2002
+4
-1
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
3
AIEEE 2002
+4
-1
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
4
AIEEE 2002
+4
-1
A heat engine absorbs heat Q1 at temperature T1 and heat Q2 at temperature T2. Work done by the engine is J (Q1 + Q2). This data :
A
violates 1st law of thermodynamics
B
violates 1st law of thermodynamics if Q1 is +ve
C
violates 1st law of thermodynamics if Q1 is -ve
D
does not violates 1st law of thermodynamics
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