Which of the following is closed system? [ KCET 1995]
0%
a) Jet engine
43%
b) Tea placed in steel kettle
43%
c) Pressure cooker
14%
d) Rocket engine during propulsion
Q.2.
For the reaction C + O2 → CO2 ..[ BHU 1995]
29%
a) ΔH > ΔE
14%
b) ΔH < ΔE
43%
c) ΔH=ΔE
14%
d) none of these
Q.3.
Enthalpy of a reaction ΔH is expressed as ... [ AIIMS 1996]
43%
a) ΔH=∑ΔHp - ∑ΔHR
43%
b) ΔH=dHp + dHR
0%
c) ΔH=dHp / dHR
14%
d) ΔH=∑Hp / dHR
Q.4.
Given thatC + O2 → CO2 ; ΔH=-x kJ2CO + O2 → 2CO2; ΔH=-y kJthe enthalpy of formation of carbon monoxide will be .. [ CBSE PMT 1997]
33%
a) (2x - y) / 2
33%
b) (y - 2x) / 2
33%
c) 2x - y
0%
d) y=2x
Q.5.
Enthalpy change (ΔH) of system depends on its ... [ Pb CET 1997]
0%
a) Initial state
29%
b) Final state
71%
c) Both initial and final state
0%
d) None of these
Q.6.
Energy required to dissociate 4 g of gaseous hydrogen into free gaseous atoms is 208 kcal at 25°C. The bond energy H-H bond will be .... [ CPMT 1989]
17%
a) 104 kcal
33%
b) 10.4 kcal
50%
c) 1040 kcal
0%
d) 104 kcal
Q.7.
The relation between enthalpy (H), pressure (P), volume (V) and internal energy (E) is given by .. [ MP PMT 1998]
17%
a) E=H + PV
33%
b) H=E + PV
50%
c) H=E - PV
0%
d) H=E + P + V
Q.8.
Based on the following thermo chemical equationsH2O(g) + C(s) → CO(g) + H2(g); ΔH=131 kJCO(g) + ½O2(g) → CO2(g); ΔH=-282 kJH2(g) + ½O2(g) → H2O; ΔH=-242 kJC(s) + O2(g) → CO2(g); ΔH=X kJthe value of X will be .... [ CBSE PMT 1992]
40%
a) -393 kJ
40%
b) -655 kJ
20%
c) +393 kJ
0%
d) +655 kJ
Q.9.
Identify the correct statement regarding entropy .. [ BHU 1998]
50%
a) At absolute zero of temperature, entropy of a perfectly crystalline substance is taken to be zero
17%
b) At absolute zero of temperature, the entropy of a perfectly crystalline substance is positive
17%
c) Absolute entropy of a substance cannot be determined
17%
d) At 0°C , the entropy of a perfectly crystalline substance is taken to be zero
Q.10.
Equal volumes of methanoic acid and sodium hydroxide are mixed. If x is the heat of formation of water, then heat evolved on neutralization is ... [ BHU 1998]
17%
a) more than x
17%
b) equal to x
50%
c) less than x
17%
d) twice x
Q.11.
The energy change of reaction C2H6(g) → 2C (g) + 6H(g) is X kJ The bond energy of C - H bond is ..[ Haryana CEET 1998]
33%
a) X/6 kJ
0%
b) X/3 kJ
33%
c) X kJ
33%
d) indeterminate
Q.12.
For the process Dry ice → CO2(g) .. [ KCET 2000]
33%
a) ΔH is positive and ΔS is negative
0%
b) Both ΔH and ΔS are negative
33%
c) Both ΔH and ΔS are positive
33%
d) ΔH is negative where as ΔS is positive
Q.13.
The enthalpy of neutralization of weak acid by a strong base is ... [ Tamil nadu CET 2001]
17%
a) -57.32 kJ
17%
b) +57.2 kJ
50%
c) equal to -57.32 kJ + enthalpy of ionization of weak acid
17%
d) more than -57.32 kJ
Q.14.
Mechanical work is specially important in systems that contain
33%
a) solid - liquid
33%
b) liquid -liquid
17%
c) solid - solid
17%
d) gases
Q.15.
If an endothermic reaction is non-spontaneous at freezing point of water and becomes feasible at its boiling point of water , then ... [ AIEEE 2002]
33%
a) ΔH is -ve, ΔS is +ve
0%
b) ΔH and ΔS both are +ve
33%
c) ΔH and ΔS both are -ve
33%
d) ΔH is +ve, ΔS is -ve
Q.16.
The bond energy of O-H bond is 109 kcal/mol. When a mole of water is formed.. [ CBSE PMT 1990]
0%
a) 218 kcal is released
40%
b) 109 kcal is released
20%
c) 218 kcal is absorbed
40%
d) 109 kcal is absorbed
Q.17.
If a reaction involves only solids and liquids, which of the following is true .. [ Tamilnadu CET 2002]
33%
a) ΔH < ΔE
33%
b) ΔH=ΔE
0%
c) ΔH > ΔE
33%
d) ΔH=ΔE + RTΔn
Q.18.
Which of the following statements is true? ..[ KCE 2002]
40%
a) ΔG may be lesser or greater or equal to ΔH
0%
b) ΔG is always proportional o ΔH
40%
c) ΔG is always greater than ΔH
20%
d) ΔG is always less than ΔH
Q.19.
Compounds with high heat of formation are less stable because .. [ KCET 2002]
17%
a) It is difficult to synthesize them
17%
b) energy rich state leads to instability
17%
c) higher temperature is required to synthesize them
50%
d) molecules of such compounds are distorted
Q.20.
The law formulated by Nernst is ... [ kerala CET 2002
20%
a) first law of thermodynamics
40%
b) second law of thermodynamics
0%
c) third law of thermodynamics
40%
d) both a and b
Q.21.
In a closed insulated container a liquid is stirred with a paddle to increase the temperature. Which of the following is true
0%
a) ΔE=W ≠ 0, q=0
20%
b) ΔE=W=q ≠ 0
80%
c) ΔE=0, W=q ≠ 0
0%
d) W=0, ΔE=q ≠ 0
Q.22.
An adiabatic expansion of an ideal gas always has ... [ MP PMT 2002]
40%
a) q=0
20%
b) w=0
20%
c) ΔH=0
20%
d) decrease temperature
Q.23.
The favorable conditions for a spontaneous reaction are .. [ MP PET 2002]
Heat exchanged in chemical reaction at constant temperature and pressure is called .. [ AFMC 1998]
20%
a) entropy
40%
b) enthalpy
20%
c) internal energy
20%
d) free energy
Q.26.
According to second law of thermodynamics, a process ( reaction) is spontaneous, if during the process .. [ kerala MEE 2001]
20%
a) ΔS universe > 0
60%
b) ΔSuniverse=0
20%
c) ΔHsystem > 0
0%
d) ΔSuniverse < 0
Q.27.
S + (3/2)O2 → SO3 + 2x calSO2 + ½O3 + y calFind out the heat of formation of SO2
20%
a) ( y -2x)
0%
b) ( 2x - y )
40%
c) ( x + y)
40%
d) 2x/y
Q.28.
One mole of an ideal gas is allowed to expand freely and adiabatically into vacuum until its volume has doubled. The expression which is not true concerning statement is .. [ PB. PMT 1998]
40%
a) ΔH=0
20%
b) ΔS=0
20%
c) ΔE=0
20%
d) W=0
Q.29.
The neutralization of strong acid by a strong base liberates an amount of energy per mole of H+ ... [ BHU 1998]
20%
a) depends upon which acid and base are involved
40%
b) depends upon the temperature at which the reaction takes place
20%
c) depends upon which catalyst is used
20%
d) is always same
Q.30.
The enthalpy and entropy change for a chemical reaction are -2.5×103 cal and 7.4 cal/deg respectively. The reaction will be .. [ AFMC 1998]
40%
a) spontaneous
20%
b) reversible
20%
c) irreversible
20%
d) non - spontaneous
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