#### 11th Standard Chemistry English Medium Free Online Test Volume 2 One Mark Questions with Answer Key 2020

11th Standard

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Chemistry

Time : 00:25:00 Hrs
Total Marks : 25

25 x 1 = 25
1. Equimolar concentrations of H2 and I2 are heated to equilibrium in a 1 litre flask. What percentage of initial concentration of Hhas reacted at equilibrium if rate constant for both forward and reverse reactions are equal

(a)

33%

(b)

66%

(c)

(33)2%

(d)

16.5%

2. Statement I: In dissociation of PCI5 to PCl3 and Cl2,Kp> Kc
Statement II : In dissociation of PCI5, ∆ng = -ve and so K, > Kc

(a)

Statement I & II are correct and statement II is the correct explanation of statement 1.

(b)

Statement I & II are correct but statement II is not the correct explanation of statement I.

(c)

Statement I is correct but statement II is wrong

(d)

Statement I is wrong but statement II is correct

3. Statement I. Addition of an inert gas at constant volume has no effect on equilibrium.
Statement II. When an inert gas is added, the total number of moles of gases present in the container increases and total pressure also increases, the partial pressure of the products and reactants are unchanged.

(a)

Statement I and II are correct but statement II is not the correct explanation of I

(b)

Statement I and II are correct and statement II is the correct explanation of I.

(c)

Statement I is correct but statement II is not correct.

(d)

Statement I is wrong but statement II is correct

4. In the reaction N2 + 3H2 ⇌ 2NH3 + x kCal, one mole of N2 reacts with 3 moles of H2 at equilibrium. Then the value of ∝ (degree of dissociation) is approximately ________. P is the pressure at equilibrium

(a)

$\frac { P\sqrt { 27{ K }_{ P } } }{ 8 }$

(b)

$\frac { 8P }{ { K }_{ P }\sqrt { 27 } }$

(c)

$\frac { P\sqrt { 27 } }{ 8{ K }_{ P } }$

(d)

$\frac{n}{v}$

5. Which one of the following gases has the lowest value of Henry's law constant?

(a)

N2

(b)

He

(c)

CO2

(d)

H2

6. The temperature at which the vapour pressure of a liquid equals external pressure is called

(a)

freezing point

(b)

boiling point

(c)

melting point

(d)

critical temperature

7. For associative solutes

(a)

i < 1 and a < 1

(b)

i > 1 and a >. 1

(c)

i < 1 and a < 1

(d)

i > 1 and a < 1

8. Among the following, which one is mostly present in sea water?

(a)

NaCl

(b)

NaI

(c)

KCl

(d)

MgBr2

9. Which one of the following is the likely bond angles of sulphur tetrafluoride molecule?

(a)

120o,80o

(b)

109o,28

(c)

90o

(d)

89o,117o

10. Which compound has planar structure?

(a)

XeF4

(b)

XeOF2

(c)

XeO2F2

(d)

XeO4

11. The shape of IF7 molecule is

(a)

square planar

(b)

tetrahedral

(c)

Pentagonal bipyramidal

(d)

linear

12. Statement I : In sulphur hexafluoride, the central atom has more than eight valence electrons.
Statement II : The central atom can accommodate additional electron pairs by using outer vacant d orbitals.

(a)

Statements I and II are correct and statement II is the correct explanation of statement I

(b)

Statements I and II are correct but statement II is not the correct explanation of statement I.

(c)

Statement I is correct but statement II is wrong.

(d)

Statement I is wrong but statement II is correct.

13. Which one of the following has tetrahedral shape?

(a)

HCHO

(b)

BeCl2

(c)

PbCl2

(d)

CF2Cl2

14. Structure of the compound whose IUPAC name is 5,6 - dimethylhept - 2 - ene is

(a)

(b)

(c)

(d)

None of these

15. Sodium nitropruside reacts with sulphide ion to give a purple colour due to the formation of

(a)

[Fe(CN)5 NO]3-

(b)

[Fe(NO)5 CN]+

(c)

[Fe(CN)5NOS]4-

(d)

[Fe (CN)5 NOS]3-

16. In which of the following compound has only one type of hybridised carbon atom?

(a)

(b)

(c)

(d)

All of these

17. Assertion (A): C2 Dr CI FI can farm 6 different geometrical isomers.
Reason (R):  Each one structure is geometrical isomer of other five structures.

(a)

Both A and Rare true and Ris correct explanation of A

(b)

Both A and R are true but R is not correct explanation of A.

(c)

A is true but R is false

(d)

Both A and R are false.

18. Which of the following does not show optical isomerism?

(a)

Glucose

(b)

Tartaric acid

(c)

Lactic acid

(d)

Methane

19. Which of the following compounds will exhibit cis-trans isomerism?

(a)

2-Butene

(b)

2-Butyne

(c)

1-Butene

(d)

2-Butanol

20. Which one is incorrect match of reactions?

(a)

(b)

$C{ H }_{ 3 }-C{ H }_{ 2 }-Br\overset { aq.\quad KOH }{ \longrightarrow } C{ H }_{ 3 }-C{ H }_{ 2 }OH$ ⟶ Nucleophilic substitution reaction

(c)

(d)

$\left( C{ H }_{ 3 } \right) C-Cl\overset { \overset { + }{ H } }{ \longrightarrow } { \left( C{ H }_{ 3 } \right) }_{ 3 }C-C{ H }_{ 2 }+{ H }_{ 2 }O+{ Cl }^{ - }$ ⟶ Nucleophilic substitution reaction

21. Assertion (A): $C{ H }_{ 3 }-\overset { + }{ C } H-C{ H }_{ 3 }$ has 6 hyper-conjugative hydrogens. While $C{ H }_{ 3 }-\overset { + }{ C } H-C{ H }_{ 2 }-C{ H }_{ 3 }$ has 5 hyper-conjugative hydrogens.
Reason (R): $C{ H }_{ 3 }-\overset { + }{ C } H-C{ H }_{ 3 }$ is more stable than $C{ H }_{ 3 }-\overset { + }{ C } H-C{ H }_{ 2 }-C{ H }_{ 3 }$

(a)

Both A and R are true and R is the correct explanation of A.

(b)

Both A and R are true but R is not the correct explanation of A.

(c)

A is true but R is false.

(d)

Both A and R are false

22. The chair form is ______________ stabole than boat form by potential energy kJ/mol.

(a)

More, 44 kJ/mol

(b)

Less, 44 kJ/mol

(c)

More, 12.55 kJ/mol

(d)

Less, 4 kJ/mol

23. Statement-I: Methane, ethane, propene and butane are alkane group compounds.
Statement-II: They are obeying CnH2n + 2 formula and each member differs from its proceeding member by a -CH2 group.

(a)

Statement-I and II are correct and Statement-II is correct explanation of statement-I.

(b)

Statement-I and II are correct but statement-II is not correct explanation of statement-I

(c)

Statement-I is correct but statement-II is wrong

(d)

Statement-I is wrong but statement-II is correct

24. Which one of the following has garlic odour?

(a)

Ethane

(b)

Ethene

(c)

Ethyne

(d)

Ethanol

25. Which among these is not associated with aliphatic compounds?

(a)

They contain (4n+2)$\pi$ electrons

(b)

They contain straight chain compounds

(c)

They contain branched chain compounds

(d)

They have appropriate number of H-atoms and functional groups.