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CBSE 11th Chemistry Organic Chemistry - Some Basic Principles and Techniques Model Questions Papers Study Material - QB365

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Questions:

Multiple Choice Question

50 x 1 = 50

Sulphuric acid reacts with sodium hydroxide as follows:
\(\mathrm{H}_{2} \mathrm{SO}_{4}+2 \mathrm{NaOH} \longrightarrow \mathrm{Na}_{2} \mathrm{SO}_{4}+2 \mathrm{H} 2 \mathrm{O}\)
When 1L of 0.1M sulphuric acid solution is allowed to react with 1L of 0.1M sodium hydroxide solution, the amount of sodium sulphate formed and its molarity in the solution obtained is _______.

(a)

0.1 mol L^-1

(b)

7.10 g

(c)

0.025 mol L^-1

(d)

3.55 g

Which of the following solutions have the same concentration?

(a)

20 g of NaOH in 200 mL of solution

(b)

0.5 mol of KCl in 200 mL of solution

(c)

40 g of NaOH in 100 mL of solution

(d)

20 g of KOH in 200 mL of solution

If 3.01 x 10²⁰ molecules are removed from 98 mg of H₂SO₄, then number of moles of H₂SO₄ left are _______.

(a)

0.5 x 10^-3 mol

(b)

0.1 x 10^-3 mol

(c)

9.95 x 10^-3 mol

(d)

1.66 x 10^-3 mol

A hydrocarbon was found to contain 85.7% by mass of carbon and 14.3% by mass of hydrogen. Molar mass of hydrocarbon is 56 g mol^-1. The formula for hydrocarbon is _______.

(a)

CH₄

(b)

C₂H₄

(c)

C₄H₈

(d)

C₅H₁₀

Which of the following represents largest number of particles _______.

(a)

Atoms in mole of CH₄

(b)

Atoms in 0.5 mol of SO₃

(c)

Atoms in 0.5 mole of CO₂

(d)

Atoms in 1 mol of CO

The mass of one mole a chloride formed by metal 'X' is 111.0 g. Which one could be formula of chloride?

(a)

XCI

(b)

XCI₂

(c)

XCI₃

(d)

XCI₄

Which of the following is not in accordance to IUPAC system?

(a)

Br-CH₂-CH = CH₂
1-bromoprop- 2-ene

(b)

(c)

(d)

Which of the following should be added in the compound for the detection of carbon and hydrogen?

(a)

Cu(I) oxide

(b)

Cu(II) oxide

(c)

Zn dust

(d)

Activated charcoal

In Kjeldahl's method for estimation of nitrogen, CuSO₄acts as ______.

(a)

oxidising agent

(b)

reducing agent

(c)

catalytic agent

(d)

hydrolysis agent

10.

For the purification, isolation and separation of organic compounds, the latest technique is ______.

(a)

chromatography

(b)

steam distillation

(c)

fractional crystallisation

(d)

sublimation

11.

Name the two types of chromatography techniques based on the principle of differential adsorption.

(a)

Column chromatography and thick layer chromatography

(b)

Non-column chromatography and thin layer chromatography

(c)

Column chromatography and thin layer chromatography

(d)

Paper chromatography and thick layer chromatography

12.

In paper chromatography, chromatography paper contains water trapped in it, which acts as the ______.

(a)

mobile phase

(b)

stationary phase

(c)

stationary medium

(d)

None of these

13.

Glycerol can be separated from spent-lye in soap industry by ______.

(a)

chromatography

(b)

sublimation

(c)

fractional distillation

(d)

distillaltion under reduced pressure

14.

Consider the following compounds,

Which of the following statements is/are true regarding I and II?

(a)

I shows + R -effect, whereas II shows -R -effect

(b)

I shows -R -effect, whereas II shows + R -effect

(c)

Both I and II show +R -effect

(d)

Both I and II show -R -effect

15.

The difference in energy between the actual structure and lowest energy canonical form is called ______.

(a)

resonance energy

(b)

localisation energy

(c)

Both (a) and (b)

(d)

All of these

16.

Choose the correct order of stability of carbocation using the concept of hyperconjugation

(a)

I < II < Ill < IV

(b)

IV < IIl < II < I

(c)

Ill < IV < II < I

(d)

None of these

17.

Ionic species are stabilised by the dispersal of charge. Which of the following carboxylate ion is the most stable?

(a)

(b)

(c)

(d)

18.

Covalent bond can undergo fission in two different ways. The correct representation involving a heterolytic fission of CH₃-Br is ______.

(a)

(b)

(c)

(d)

19.

What is the correct order of decreasing stability of the following cations?

(a)

II > I > III

(b)

II > III > I

(c)

Ill > I > II

(d)

I > II > III

20.

Which of the following compounds will exhibit geometrical isomerism?

(a)

1-phenyl-2-butene

(b)

3-phenyl-1-butene

(c)

2-phenyl-1-butene

(d)

1, 1-diphenyl-1-propane

21.

Study the structures given below carefully and choose the type of isomerism they represent

(a)

chain isomerism

(b)

position isomerism

(c)

functional isomerism

(d)

metamerism

22.

In which of the following, functional group isomerism is not possible?

(a)

Alcohols

(b)

Aldehydes

(c)

Alkyl halides

(d)

Cyanides

23.

The IUPAC name for ______.

(a)

t-hydroxypentane-t,4-dione

(b)

1,4-dioxopentanol

(c)

1-carboxybutan-S-one

(d)

4-oxopentanoic acid

24.

Which of the following is a homo cyclic alicyclic compound?

(a)

(b)

(c)

(d)

25.

Which of the following is a correct representation of condensed formula for HOCH₂CH₂CH₂CH(CH₃)CH(CH₃ )CH₃?

(a)

HO(CH₂)₂ CHCH₃CH(CH₃)₂

(b)

HO(CH₂)₃ CH(CH₃ )CH(CH₃)₂

(c)

HOCH₂CHCH₃CH(CH₃)₂

(d)

None of the above

26.

The correct order of electronegativity of carbon in ethane, ethene and ethyne is ______.

(a)

ethane < ethene < ethyne

(b)

ethyne < ethene < ethane

(c)

ethene < ethyne < ethane

(d)

ethene < ethane < ethyne

27.

Which type of bond is formed between carbon atom and nitrogen atom?

(a)

Covalent bond

(b)

Ionic bond

(c)

Dative bond

(d)

None of these

28.

If 1mL of water contains 20 drops then number of molecules in a drop of water is _______.

(a)

6.023 x 10²³ molecules

(b)

1.376 x 10²⁶ molecules

(c)

1.62 x 10²¹molecules

(d)

4.346 x 10²⁰ molecules

29.

Zinc sulphate contains 22.65% zinc and 43.9% water of crystallisation. If the law of constant proportions is true then the weight of zinc required to produce 20 g of the zinc sulphate crystals will be _______.

(a)

45.3 g

(b)

4.53 g

(c)

0.453 g

(d)

453 g

30.

A solution is prepared by adding 2 g of a substance A to 18 g of water. Calculate the mass per cent of the solute.

(a)

(b)

(c)

10%

(d)

11%

31.

In the following reaction, \(\mathrm{MnO}_{2}+4 \mathrm{HCl} \longrightarrow \mathrm{MnCl}_{2}+2 \mathrm{H}_{2} \mathrm{O}+\mathrm{Cl}_{2}\) 2 moles of Mn02 react with 4 moles of HCl to form 11.2 LCl₂ at STP. Thus, percent yield of Cl₂ is _______.

(a)

25%

(b)

50%

(c)

100%

(d)

75%

32.

If 500 mL of a 5M solution is diluted to 1500 mL, what will be the molarity of the solution obtained?

(a)

1.5 M

(b)

1.66 M

(c)

0.017 M

(d)

1.59 M

33.

Air contains 20% O₂ by volume. How much volume of air will be required for combustion of 100 cc of acetylene?

(a)

500 cc

(b)

1064 cc

(c)

212.8 cc

(d)

1250 cc

34.

1.020 g of metallic oxide contains 0.540 g of the metal. If the specific heat of the metal, Mis 0.216 cal deg^-1g^-1. The molecular formula of its oxide is _______.

(a)

(b)

M₂O₃

(c)

M₂O₄

(d)

M₂O

35.

How many number of aluminium ions are present in 0.051 g of aluminium oxide?

(a)

6.023 x 10²³ ions

(b)

3 ions

(c)

6.023 x 10²⁰ ions

(d)

9 ions

36.

Given that, the abundances of isotopes ⁵⁴Fe, ⁵⁶Fe and ⁵⁷Fe are 5%, 90% and 5% respectively, the atomic mass of Fe is _______.

(a)

55.85

(b)

55.95

(c)

55.75

(d)

56.05

37.

0.2429 g sample of potassium is heated in oxygen, 0.440 g of a crystalline compound is obtained. What is the formula of this compound?

(a)

(b)

K₂O

(c)

KO₂

(d)

KO₃

38.

Arrange the following in the order of increasing mass (Atomic mass of 0 = 16, Cu = 63 and N = 14).
I. One atom of oxygen
II. One atom of nitrogen
III. 1x 10-10 mole of oxygen
IV. 1 x 10-10 mole of copper

(a)

II< 1< III< IV

(b)

1< II< III< IV

(c)

III< II< IV< I

(d)

IV< II< III< I

39.

Agas is found to have the formula (CO)_x. Its vapour density is 70. The value of x will be _______.

(a)

(b)

(c)

(d)

40.

An alkaloid contains 17.28% of nitrogen and its molecular mass is 162. The number of nitrogen atoms present in one molecule of alkaloid is _______.

(a)

(b)

(c)

(d)

41.

If the density of a solution is 3.12 g ml^-1, the mass of 1.5 mL solution in significant figures is _____.

(a)

4.7 g

(b)

4680 x 10^-3 g

(c)

4.680 g

(d)

46.80 g

42.

The result reported in the following multiplication of significant figures, 2.5 x 1.25 = 3.125 should be _______.

(a)

3.125

(b)

3.1

(c)

3.12

(d)

3.10

43.

The IUPAC name of this compound is

(a)

3-ethyl-4-chloro-1, 4-pentadiene

(b)

2-chloro-3-ethyl-1, 4-pentadiene

(c)

4-chloro ethyl-1-pentene

(d)

3-ethyl-4-chloro-4-pentene

44.

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

(a)

2-Butene

(b)

2-Butyne

(c)

1-Butene

(d)

2-Butanol

45.

The reaction

(a)

carbocation formation

(b)

free-radical mechanism

(c)

carbanion formation

(d)

none of these

46.

The IUPAC name of ______.

(a)

1, 2-dichloropropane

(b)

3, 3-dichloropropane

(c)

1, 1-dichloropropane

(d)

dichloropropane

47.

The large number of organic compounds is due to _______.

(a)

the valency of carbon

(b)

a small size of carbon

(c)

a special property of carbon known as catenation

48.

The mass of an atom of nitrogen is _______.

(a)

\(\frac { 14 }{ { { 6.023\times 10 }^{ 23 } } } \)

(b)

\(\frac { 28 }{ { { 6.023\times 10 }^{ 23 } } } \)g

(c)

\(\frac { 1 }{ { { 6.023\times 10 }^{ 23 } } } \)g

(d)

14 amu

49.

How many grams are contained in 1 gram atom of Na?

(a)

13 g

(b)

1 g

(c)

23 g

(d)

\(\frac { 1 }{ 23 } \) g

50.

5.6 litres of oxygen at NTP is equivalent to _______.

(a)

1 mole

(b)

\(\frac { 1 }{ 4 } \)mole

(c)

\(\frac { 1 }{ 8 } \)mole

(d)

\(\frac { 1 }{ 2 } \)mole

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Answers Key:

Multiple Choice Question

50 x 1 = 50

(b)
7.10 g

(a)
20 g of NaOH in 200 mL of solution

(a)
0.5 x 10^-3 mol

(a)
Atoms in mole of CH₄

(b)
XCI₂

(a)
Br-CH₂-CH = CH₂
1-bromoprop- 2-ene

(b)
Cu(II) oxide

10.

(a)
chromatography

11.

12.

(b)
stationary phase

13.

(d)
distillaltion under reduced pressure

14.

(a)
I shows + R -effect, whereas II shows -R -effect

15.

(a)
resonance energy

16.

(b)
IV < IIl < II < I

17.

18.

19.

(a)
II > I > III

20.

(a)
1-phenyl-2-butene

21.

(a)
chain isomerism

22.

23.

(d)
4-oxopentanoic acid

24.

25.

(b)
HO(CH₂)₃ CH(CH₃ )CH(CH₃)₂

26.

(a)
ethane < ethene < ethyne

27.

(a)
Covalent bond

28.

29.

(b)
4.53 g

30.

31.

(b)
50%

32.

(b)
1.66 M

33.

(d)
1250 cc

34.

(b)
M₂O₃

35.

36.

(b)
55.95

37.

38.

(a)
II< 1< III< IV

39.

40.

(d)
2

41.

(a)
4.7 g

42.

(b)
3.1

43.

(b)
2-chloro-3-ethyl-1, 4-pentadiene

44.

(a)
2-Butene

45.

(b)
free-radical mechanism

46.

47.

48.

(b)
\(\frac { 28 }{ { { 6.023\times 10 }^{ 23 } } } \)g

49.

50.

(b)
\(\frac { 1 }{ 4 } \)mole

CBSE 11th Chemistry Organic Chemistry - Some Basic Principles and Techniques Model Questions Papers Study Material - QB365 Set A

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Std: 11th Standard CBSE - Chemistry

chapter: Organic Chemistry - Some Basic Principles and Techniques - Model Questions Papers

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