Consider the following reaction occuring in an automobile 2C8H18(g) +25O2(g) → 16CO2(g) + 18H2O(g) The sign of ΔH , ΔS and ΔG would be [ AIPMT 1994]
44%
a)+, -, +
33%
b) -, +, -
22%
c) -, +, +
0%
d) +, + , -
Q.2.
During isothermal expansion of an ideal gas its... [ AIPMT 1994]
33%
a) internal energy increases
33%
b) enthalpy decreases
17%
c) enthalpy remains unaffected
17%
d) enthalpy reduces to zero
Q.3.
For the reaction N2 + 3H2 ⇒ 2NH3, ΔH = ? [ AIPMT 1991]
12%
a) ΔE + 2RT
38%
b) ΔE - 2RT
50%
c) ΔH = RT
0%
d) ΔE - RT
Q.4.
If enthapies of formation of C2H4(g), CO2(g) and H2O(l) at 25° and 1atm pressure are 52, -394, and -286kJ/mol, the enthalpy of combusion pf ethene is equl to [AIPMT 1995]
33%
a) -141.2 kJ/mol
33%
b) -1412 kJ/mol
33%
c) +14.2 kJ/mol
0%
d) +1412 kJ/mol
Q.5.
Given that C(s) + O2(g) → CO2(g), ΔH&dge = -x kJ 2CO(g) + O2 → 2CO2(g), ΔH&dge = -ykJ The enthalpy of formation of carbon monoxide will be .. [ AIPMT 1997]
50%
a) y - 2x
17%
b) 2x-y
0%
c) (y-2x)/2
33%
d) (2x-y)/2
Q.6.
Enthalpy of the reaction, CH4 + ½O2 → CH3OH is negative. if enthalpy of combustion of CH4 and CH3OH are 'x' and 'y' respectively, then which relation is correct? [ AIPMT 2001]
50%
a) x > y
0%
b) x < y
33%
c) x = y
17%
d) x ≥ y
Q.7.
For which one of the following equations ΔH°r equal to ΔH°f for the product? [ AIPMT 2003]
50%
a) Xe(g) + 2F2(g) → XeF4(g)
17%
b) 2CO(g) + O2(g) → 2CO2(g)
0%
c) N2(g) + O3(g) → N2O3(g)
33%
d) CH4(g) + 2Cl2 → CH2Cl2(l) + 2HCl(g)
Q.8.
If the bond energies of H-H, Br-Br and H-Br are 433, 192, and 364 kJmol- respectively, then ΔH° for the reaction H2(g) + Br2(g) → 2HBr(g) is .... [ AIPMT 2004]
0%
a) -261 kJ
67%
b) +103kJ
17%
c) +261kJ
17%
d) -103 kJ
Q.9.
A reaction occurs spontaneously if ... [ AIPMT 2005]
75%
a) TΔS < ΔH and both ΔH and ΔS are +ve
0%
b) TΔS > ΔH and both ΔH and ΔS are +ve
25%
c) TΔS = ΔH and both ΔH and ΔS are +ve
0%
d) TΔS > ΔH and ΔH is +ve and ΔS are -ve
Q.10.
Which of the following pairs of a chemical reaction is certain to result in a spontaneous reaction? [ AIPMT 2005]
0%
a) Exothermic and decreasing disorder
75%
b) Endothermic and increasing disorder
25%
c) Exothermic and increasing disorder
0%
d) Endothermic and decreasing disorder
Q.11.
Standard enthalpy of vaporization ΔvapH° for water at 100°C is 40.66 kJ mole-The internal energy of vaporisation of water at 100&dgeC (inkJ mol-1) is (assume water vapour to behace like an ideal gas)[ AIPMT 2012]
40%
a) +37.56
0%
b) -43.76
0%
c) +43.76
60%
d) +40.66
Q.12.
The enthalpy of fusion of water is 1.435 kcal/mol. the molar entropy change for the melting of ice at 0°C is [ AIPMT 2012]
100%
a) 10.52 cal/mol K
0%
b) 21.04 cal/mol K
0%
c) 5.260 cal/mol K
0%
d) 0.526 cal/mol k
Q.13.
Given C + 2S → CS2 , ΔHfo=+ 117.0 kJ/molC+ O2 → CO2 , ΔHfo=- 393.0 kJ/molS+ O2 → SO2 , ΔHfo=- 287.0 kJ/mol The heat of combustion of CS2 + 3O2 → CO2 + 2SO2 is ... [ KCET 1994]
0%
a) - 807 kJ/mol
67%
b) -1084 kJ/mol
0%
c) +1104 kJ/mol
33%
d) +807 kJ/mol
Q.14.
When water is added to conc. H2SO4 it gets very hot. This happens because dilution of conc. H2SO4 is .... [ NCERT 1984]
0%
a) an exothermic reaction
33%
b) an endothermic reaction
67%
c) photochemical reaction
0%
d) hydrolytic reaction
Q.15.
The ΔHfo for CO2(g), CO(g) and H2O(g) are -393.5, -110.5 and -241.8 kJ/mol respectively. The standard enthalpy change ( in kJ) for the reactionCO2(g) + H2(g) → CO(g) + H2O(g) is ... [ IIT 2000]
33%
a) 524.1
17%
b) 41.2
17%
c) -262.5
33%
d) -41.2
Q.16.
The enthalpy of formation for C2H4(g), CO2(g) and H2O(l) at 25°C and 1atm pressure are 52, -394, -286 kJ/mol respectively. The enthalpy oc combustion of C2H4(g) will be .. [ CBSE PMT 1995]
25%
a) + 1412 kJ/mol
50%
b) -1412 kJ/mol
0%
c) + 141.2 kJ/mol
25%
d) -141.2 kJ/mol
Q.17.
For which of the following process will energy be absorbed? [ NCERT 1983]
33%
a) Separating an electron from an electron
0%
b) Separating a proton from proton
33%
c) Separating a neutron from neutron
33%
d) separating an electron from neutral atom
Q.18.
Which one of the following conditions will favour maximum formation of the product in the reaction, ... [NEET 2018] A2 (g) + B2 (g) ⇌ X2 (g) Δr H = – X kJ ?
20%
a) High temperature and high pressure
80%
b) Low temperature and low pressure
0%
c) Low temperature and high pressure
0%
d) High temperature and low pressure
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