11th Standard Syllabus & Materials
11th Standard
TN 11th Tamil இயற்கை வேளாண்மை,சுற்றுச்சூழல் -செய்யுள் - மனோன்மணீயம் Important Questions And Answers Study Material - QB365 Set A
NEW11th Standard
TN 11th Tamil என்னுயிர் என்பேன் -துணைப்பாடம் - இசைத்தமிழர் இருவர் Important Questions And Answers Study Material - QB365 Set A
NEW11th Standard
TN 11th Tamil மொழி கலை -செய்யுள் - ஒவ்வொரு புல்லையும் Important Questions And Answers Study Material - QB365 Set A
NEW11th Standard
TN 11th Tamil பீடு பெற நில் - இலக்கணம் - பகுபத உறுப்புகள் Important Questions And Answers Study Material - QB365 Set A
NEW11th Standard
TN 11th Tamil பீடு பெற நில் - துணைப்பாடம் - வாடிவாசல் Important Questions And Answers Study Material - QB365 Set A
NEW11th Standard
TN 11th Tamil பீடு பெற நில் - செய்யுள் - குறுந்தொகை Important Questions And Answers Study Material - QB365 Set A

Published on: 30/09/2018
Important 1mark -chapter 7,8
Download Tamil Nadu 11th Standard Chemistry question papers, model tests, one-mark questions, important questions, and public exam papers in PDF format. Free study materials and answer keys for TN State Board students.
Questions + Answers key
Take MCQ Chemistry Test

1.
The equilibrium constants of the following reactions are:
| N2 + 3H2 ⇌ 2NH3 : | K1 |
| N2 + O2 ⇌ 2NO : | K2 |
| H2 + ½O2 ⇌ H2O : | K3 |
The equilibrium constant (K) for the reaction ;
\({ 2NH }_{ 3 }+5/2{ O }_{ 2 }\overset { K }{ \rightleftharpoons } 2NO+{ 3H }_{ 2 }{ O },\) will be
\(K_2^3{K_3\over K_1}\)
\(K_1{K_3^3\over K_2}\)
\(K_2{K_3^3\over K_1}\)
\(K_2{K_3\over K_1}\)
2.
Consider the following reversible reaction at equilibrium, A + B ⇌ C, If the concentration of the reactants A and B are doubled, then the equilibrium constant will ___________
be doubled
become one fourth
be halved
remain the same
3.
For the formation of Two moles of SO3(g) from SO2 and O2, the equilibrium constant is K1. The equilibrium constant for the dissociation of one mole of SO3 into SO2 and O2 is __________
\(1/K_1\)
\(K_1^2\)
\(({1\over K_1})^{1/2}\)
\({K_1\over 2}\)
4.
In a chemical equilibrium, the rate constant for the forward reaction is 2.5 \(\times\)102 and the equilibrium constant is 50. The rate constant for the reverse reaction is ____________
11.5
5
2 x 102
2 x 10-3
5.
Consider the reaction where KP = 0.5 at a particular temperature
PCl5(g) ⇌ PCl3 (g) + Cl2 (g)
if the three gases are mixed in a container so that the partial pressure of each gas is initially 1 atm, then which one of the following is true ____________
more PCl3 will be produced
more Cl2 will be produced
more PCl5 will be produced
none of these
6.
In the reaction,
Fe (OH)3 (s) ⇌ Fe3+(aq) + 3OH–(aq),
if the concentration of OH– ions is decreased by ¼ times, then the equilibrium concentration of Fe3+ will
not changed
also decreased by ¼ times
increase by 4 times
increase by 64 times
7.
The values of KP1 and KP2 for the reactions
X ⇌ Y + Z
A ⇌ 2B are in the ratio 9 : 1 if degree of dissociation and initial concentration of X and A be equal then total pressure at equilibrium P1 and P2 are in the ratio __________
36 : 1
1 : 1
3 : 1
1 : 9
8.
If x is the fraction of PCl5 dissociated at equilibrium in the reaction
PCl5 ⇌ PCl3 + Cl2
then starting with 0.5 mole of PCl5, the total number of moles of reactants and products at equilibrium is ___________
0.5 - x
x + 0.5
2x + 0.5
x + 1
9.
For the reaction AB (g) ⇌ A(g) + B(g), at equilibrium, AB is 20% dissociated at a total pressure of P, The equilibrium constant KP is related to the total pressure by the expression __________
P = 24 KP
P = 8 KP
24 P = KP
none of these
10.
\({K_c\over K_p}\) for the reaction,
N2(g) + 3H2(g) ⇌ 2NH3(g) is ___________
\({1\over RT}\)
\(\sqrt{RT}\)
RT
(RT)2
11.
In the equilibrium,
2A(g) ⇌ 2B(g) + C2(g)
the equilibrium concentrations of A, B and C2 at 400 K are 1\(\times\)10–4 M, 2.0 \(\times\)10–3 M, 1.5 \(\times\)10–4 M respectively. The value of KC for the equilibrium at 400 K is ________
0.06
0.09
0.62
3 x 10-2
12.
K1 and K2 are the equilibrium constants for the reactions respectively.
\({ N }_{ 2 }(g)+{ O }_{ 2 }(g)\overset { { K }_{ 1 } }{ \rightleftharpoons } 2NO(g)\)
\(2NO(g)+{ O }_{ 2 }(g)\overset { { K }_{ 2 } }{ \rightleftharpoons } { 2NO }_{ 2 }(g)\)
What is the equilibrium constant for the reaction NO2(g) ⇌ ½N2(g) + O2(g)
\({1\over \sqrt{K_1K_2}}\)
(K1 = K2)1/2
\({1\over 2K_1K_2}\)
\(({1\over K_1K_2})^{3/2}\)
13.
Which one of the following is incorrect statement?
for a system at equilibrium, Q is always less than the equilibrium constant
equilibrium can be attained from either side of the reaction
presence of catalyst affects both the forward reaction and reverse reaction to the same extent
Equilibrium constant varied with temperature
14.
The formation of ammonia from N2(g) and H2(g) is a reversible reaction
N2(g) + 3H2(g) ⇌ 2NH3(g) + Heat
What is the effect of increase of temperature on this equilibrium reaction ______________
equilibrium is unaltered
formation of ammonia is favoured
equilibrium is shifted to the left
reaction rate does not change
15.
If Kb and Kf for a reversible reactions are 0.8 x 10–5 and 1.6 x 10–4 respectively, the value of the equilibrium constant is __________
20
0.2 x 10-4
0.05
none of these
16.
The standard substance used in the enthalpy of combustion of a substance in bomb calorimeter is _______
methane
acetic acid
propane
benzoic acid
17.
For the process to occur under adiabatic conditions, the correct condition is __________
ΔT=0
ΔP=0
q=0
w=0
18.
Which of the following properties is not a function of state?
Concentration
Internal energy
Enthalpy
Entropy
19.
Thermodynamics is applicable to ________
macroscopic system only
microscopic system only
homogeneous system only
heterogeneous system only
20.
Which one of the following is an intensive property??
Specific heat capacity
Mass
Enthalpy
Heat capacity
21.
Which one of the following is an extensive property?
Molar volume
Density
Molarity
Entropy
22.
Two similar reactions are given below:
H2(g)+\(\frac { 1 }{ 2 } \)O2(g) \(\rightarrow\)H2O(g); \(\Delta\)H = \(\Delta\)H1
H2(g)+\(\frac { 1 }{ 2 } \)O2(g)\(\rightarrow\)H2O(l); \(\Delta\)H = \(\Delta\)H2
In terms of magnitude, of \(\Delta\)H
\(\Delta\)H1 > \(\Delta\)H2
\(\Delta\)H1 < \(\Delta\)H2
\(\Delta\)H1 = \(\Delta\)H2
cannot be predicted
23.
In an adiabatic process, no transfer of heat takes place between the system and surroundings. Choose the convert option for free expansion of ideal gas under adiabatic conditions from the following:
q=0; \(\Delta\)T \(\neq \)0; w = 0
q\(\neq \)0;\(\Delta\)T =0; w = 0
q = 0; \(\Delta\)T = 0; w = 0
q = 0; \(\Delta\)T < 0; w \(\neq \)0
24.
Heat liberated when 100 ml of IN NaOH is neutralized by 300 ml of IN HCI __________
22.92 kJ
17.19 kJ
11.6 kJ
5.73 kJ
25.
Identify the state quantity among the following:
q
q-w
q+w
q/w
26.
Which of the following units represent largest amount of energy?
calories
Joule
erg
eV
27.
Entropy change involved in the conversion of 1 mole of liquid water at 373K to vapour at the same temperature will be (\(\Delta\)Hvap=2.257 kJg-1) ____________
0.119 kJ
0.109 kJ
0.129 kJ
0.120 kJ
28.
-\(\Delta\) G is the net work done by the system except ____________
Electrical work
Expansion work
Chemical work
Photo chemical work
29.
An efficiency of an engine is always ____________
=0%
>100%
<100%
= 100%
30.
When solid melts there is ____________
an increase of entropy
a decrease in entropy
an increase in free energy
an increase of heat of fusion
31.
Solve: ΔH=10 k cal mol-1, ΔS=20 cal deg-1 mol-1 and T=300k. Then ΔG=?
-18,000 cals mol-1
18,000 cals mol-1
-16,000 cals mol-1
4000 cals mol-1
32.
The condition for standard free energy is _______
298 K, 1 atm
273 K, 1 atm
2980 C, 5 atm
25 K, 1atm
33.
For a given reaction \(\triangle\)G obtained was having positive sign convention. State whether the reaction was spontaneous or non-spontaneous.
spontaneous
non-spontaneous
reversible
equilibrium
34.
In an exothermic reaction, heat is evolved and system loses heat to the surroundings. For such system
(i) qp will be negative
(ii) ΔrH will be positive
(iii) qp will be positive
(iv) ΔrH will be negative
(i), (ii)
(iii), (iv)
(i) & (iv)
(ii) & (iii)
35.
The heat of neutralisation of strong acid and strong base is __________
+57.32 KJ
+75.32 KJ
-75.32 KJ
-57.32 KJ
36.
Identify the suitable condition(s) which helps the adiabatic process to occur?
(i) ΔT = 0
(ii)ΔP = 0
(iii) q = 0
(iv) w = 0
Only (i)
Only (iii)
(i) and (ii)
(i), (ii) and (iv)
37.
In a compression process, Pext is ___________
(Pint+ dP)
(Pint- dP)
(dP-Pint)
(-Pint+dP)
38.
The gravitational work done by an object is __________
Qv
fx
PV
mgh
39.
The SI unit of heat is ____________
Joule
Calorie
mole
J mol-1
40.
Which among the following is a path function?
Enthalpy
Free energy
Internal energy
Work
41.
Which among the following is a state function?
Pressure
Enthalpy
Heat
Both (a) and (b)
42.
Internal energy is denoted by the symbol_______
H
S
G
U
43.
The process in which temperature of the system remains constant is called __________ process
isobaric
isothermal
adiabatic
isochoric
44.
A portion of matter under consideration, which is separated from rest of universe by real or imaginary boundaries is called_____________
surroundings
system
boundary
Universe
45.
ΔS is expected to be maximum for the reaction ____________
Ca(S)+ 1/2O2(g) ⟶ CaO(S)
C(S) + O2(g) ⟶ CO2(g)
N2(g) + O2(g) ⟶ 2NO(g)
CaCO3(S) ⟶ CaO(S) + CO2(g)
46.
When 15.68 litres of a gas mixture of methane and propane are fully combusted at 0° C and 1 atmosphere, 32 litres of oxygen at the same temperature and pressure are consumed. The amount of heat of released from this combustion in KJ is _____________ (ΔHc (CH4) = - 890 KJ mol-1 and ΔHc (C3H8 = - 2220 KJ mol-1)
- 889 kJ mol-1
- 1390 kJ mol-1
- 3180 kJ mol-1
- 635.47 kJ mol-1
47.
The value of ΔH for cooling 2 moles of an ideal monatomic gas from 125° C to 25° C at constant pressure will be [given Cp = \(\frac{5}{2}\)R] ____________.
- 250 R
- 500 R
500 R
+ 250 R
48.
The enthalpies of formation of Al2O3 and Cr2O3 are -1596 kJ and -1134 kJ, respectively. ΔH for the reaction 2Al + Cr2O3 ⟶ 2Cr + Al2O3 is _______________
- 1365 kJ
2730 kJ
- 2730 kJ
- 462 kJ
49.
The intensive property among the quantities below is ____________
mass
volume
enthalpy
\(\frac { mass }{ volume } \)
50.
In a reversible process, the change in entropy of the universe is ____.
> 0
> 0
< 0
= 0
1.
(c)
\(K_2{K_3^3\over K_1}\)
2.
(d)
remain the same
3.
(c)
\(({1\over K_1})^{1/2}\)
4.
(b)
5
5.
(c)
more PCl5 will be produced
6.
(d)
increase by 64 times
7.
(a)
36 : 1
8.
(b)
x + 0.5
9.
(a)
P = 24 KP
10.
(d)
(RT)2
11.
(a)
0.06
12.
(a)
\({1\over \sqrt{K_1K_2}}\)
13.
(a)
for a system at equilibrium, Q is always less than the equilibrium constant
14.
(c)
equilibrium is shifted to the left
15.
(a)
20
16.
(d)
benzoic acid
17.
(c)
q=0
18.
(a)
Concentration
19.
(a)
macroscopic system only
20.
(a)
Specific heat capacity
21.
(d)
Entropy
22.
(b)
\(\Delta\)H1 < \(\Delta\)H2
23.
(c)
q = 0; \(\Delta\)T = 0; w = 0
24.
(d)
5.73 kJ
25.
(c)
q+w
26.
(a)
calories
27.
(b)
0.109 kJ
28.
(b)
Expansion work
29.
(c)
<100%
30.
(a)
an increase of entropy
31.
(c)
-16,000 cals mol-1
32.
(a)
298 K, 1 atm
33.
(b)
non-spontaneous
34.
(c)
(i) & (iv)
35.
(d)
-57.32 KJ
36.
(b)
Only (iii)
37.
(a)
(Pint+ dP)
38.
(d)
mgh
39.
(a)
Joule
40.
(d)
Work
41.
(d)
Both (a) and (b)
42.
(d)
U
43.
(b)
isothermal
44.
(b)
system
45.
(d)
CaCO3(S) ⟶ CaO(S) + CO2(g)
46.
(d)
- 635.47 kJ mol-1
47.
(b)
- 500 R
48.
(d)
- 462 kJ
49.
(d)
\(\frac { mass }{ volume } \)
50.
(d)
= 0
11th Standard Syllabus & Materials
11th Standard
TN 11th Tamil பீடு பெற நில் - செய்யுள் - காவடிச்சிந்து Important Questions And Answers Study Material - QB365 Set A
NEW11th Standard
TN 11th Tamil பீடு பெற நில் - உரைநடை - மலை இடப்பெயர்கள் : ஓர் ஆய்வு Important Questions And Answers Study Material - QB365 Set A
NEW11th Standard
TN 11th Tamil மாமழை போற்றுதும் - துணைப்பாடம் - யானை டாக்டர் Important Questions And Answers Study Material - QB365 Set A
NEW11th Standard
TN 11th Tamil மாமழை போற்றுதும் - செய்யுள் - ஐங்குறுநூறு Important Questions And Answers Study Material - QB365 Set A
Tamilnadu Stateboard 11th Standard Subjects

Maths

Commerce

Economics

Biology

Business Maths and Statistics

Accountancy

Computer Science

Physics

Chemistry

Maths

Biology

Economics

Physics

Chemistry

History

Business Maths and Statistics

Computer Science

Accountancy

Computer Applications

History

Computer Technology

Commerce

Computer Applications

Computer Technology

Tamil

English

French
Tamilnadu Stateboard Standards