Chemistry
Topic: UNIT 7: Thermodynamics
Tag: TN 11th Chemistry
Q.1
The
amount of heat exchanged with the surrounding at constant temperature and
pressure is given by the quantity
A. ∆E
B. ∆H
C. ∆S
D. ∆G
Answer : Option B
Explaination / Solution:
No Explaination.
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Topic: UNIT 7: Thermodynamics
Tag: TN 11th Chemistry
Q.2
The
enthalpies of formation of Al2O3 and Cr2O3
are – 1596 kJ and – 1134 kJ, respectively. ∆H for the reaction 2Al + Cr2O3
→ 2Cr + Al2O3 is
A. –
1365 kJ
B. 2730
kJ
C. –
2730 kJ
D. –
462 kJ
Answer : Option D
Explaination / Solution:
2Al + Cr2O3 → 2Cr + Al2O3
ΔHr0 = [2ΔHf (Cr) + ΔHf (Al2O3)]–
[2ΔHf (Al) + ΔHf
(Cr2O3)] ΔHr0 = [0 + (–
1596 kJ)]– [0 + (– 1134)]
ΔHr0 = – 1596
kJ + 1134 kJ
ΔHr0 = – 462
kJ
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Topic: UNIT 7: Thermodynamics
Tag: TN 11th Chemistry
Q.3
The
temperature of the system, decreases in an ___________________
A. Isothermal
expansion
B. Isothermal
Compression
C. adiabatic
expansion
D. adiabatic
compression
Answer : Option C
Explaination / Solution:
No Explaination.
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Topic: UNIT 6: Gaseous State
Tag: TN 11th Chemistry
Q.4
The
temperatures at which real gases obey the ideal gas laws over a wide range of
pres-sure is called
A. Critical
temperature
B. Boyle
temperature
C. Inversion
temperature
D. Reduced
temperature
Answer : Option B
Explaination / Solution:
The
temperature at which real gases obey the ideal gas laws over a wide range of pressure
is called Boyle temperature
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Topic: UNIT 6: Gaseous State
Tag: TN 11th Chemistry
Q.5
At
identical temperature and pressure, the rate of diffusion of hydrogen gas is
3√3 times that of a hydrocarbon having molecular formula CnH2n–2.
What is the value of n ?
A. 8
B. 4
C. 3
D. 1
Answer : Option B
Explaination / Solution:
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Q.6
For
alkali metals, which one of the following trends is incorrect ?
A. Hydration
energy : Li > Na > K > Rb
B. Ionisation
energy : Li > Na > K > Rb
C. Density
: Li < Na < K < Rb
D. Atomic
size : Li < Na < K < Rb
Answer : Option C
Explaination / Solution:
Potassium is lighter than sodium (Refer table 5.3)
The correct order of density is Li < K < Na
< Rb < Cs
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Q.7
The
product obtained as a result of a reaction of nitrogen with CaC2 is
A. Ca(CN)3
B. CaN2
C. Ca(CN)2
D. Ca3N2
Answer : Option C
Explaination / Solution:
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Q.8
Which
of the following statement is false ?
A. Ca2+
ions are not important in maintaining the regular beating of the heart
B. Mg2+
ions are important in the green parts of the plants
C. Mg2+
ions form a complex with ATP
D. Ca2+
ions are important in blood clotting
Answer : Option A
Explaination / Solution:
Ca2+
ion plays an important role in maintaining regular heart beat.
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Topic: UNIT 4: Hydrogen
Tag: TN 11th Chemistry
Q.9
Non-stoichiometric
hydrides are formed by
A. palladium,
vanadium
B. carbon,
nickel
C. manganese,
lithium
D. nitrogen,
chlorine
Answer : Option A
Explaination / Solution:
No Explaination.
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Topic: UNIT 4: Hydrogen
Tag: TN 11th Chemistry
Q.10
The
hybridisation of oxygen atom is H2O and H2O2
are, respectively
A. sp
and sp3
B. sp
and sp
C. sp
and sp2
D. sp3
and sp3
Answer : Option D
Explaination / Solution:
No Explaination.
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