Question Set B

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

Anything that influences the valence electrons will affect the chemistry of the element. Which one of the following factors does not affect the valence shell?

(a)

Valence principal quantum number (n)

(b)

Nuclear charge (Z)

(c)

Nuclear mass

(d)

Number of core electrons

Which of the following statements related to the modern periodic table is incorrect?

(a)

The p-block has 6 columns, because a maximum of 6 electrons can occupy all the orbitals in a p-shell.

(b)

The d-block has 8 columns, because a maximum of 8 electrons can occupy all the orbitals in a d-subshell.

(c)

Each block contains a number of columns equal to the number of electrons that can occupy that subshell.

(d)

The block indicates value of azimuthal quantum number (l) for the last subshell that received electrons in building up the electronic configuration

Which of the following statements related to the modern periodic table is incorrect?

(a)

The p-block has 6 columns, because a maximum of 6 electrons can occupy all the orbitals in a p-shell.

(b)

The d-block has 8 columns, because a maximum of 8 electrons can occupy all the orbitals in a d-subshell.

(c)

Each block contains a number of columns equal to the number of electrons that can occupy that subshell.

(d)

The block indicates value of azimuthal quantum number (l) for the last subshell that received electrons in building up the electronic configuration.

The general electronic configuration of d-block elements is ______.

(a)

\((n-1) d^{1 \text { to } 10} n s^{2}\)

(b)

\((n-1) d^{1-10} n s^{0-2}\)

(c)

\((n-1) d^{1 \text { to } 10} n s^{1-2}\)

(d)

\((n-1) d^{1-9} n s^{0-2}\)

One mole of oxygen gas at STP is equal to _________

(a)

6.022 x 10²³ molecules of oxygen

(b)

6.022 x 10²³ atoms of oxygen

(c)

16 g of oxygen

(d)

32 g of oxygen

What is mass silicon in 100 g of sodium silicate, Na₂SiO₃? [Na = 23, Si = 28, O = 16u]

(a)

16.7%

(b)

23.0%

(c)

28.0%

(d)

82.0%

What is the technological applications of fractional distillation?

(a)

To separate different fractions of crude oil in petroleum industry

(b)

To separate different fractions of volatile and non-volatile solvents

(c)

To separate mixture of amino acids

(d)

No technological application of fractional distillation

The fragrance of flowers is due to the presence of some steam volatile organic compounds called essential oils. These are generally insoluble in water at room temperature but are miscible with water vapour in vapour phase. Asuitable method for the extraction of these oils from the flowers is ______.

(a)

distillation

(b)

crystallisation

(c)

distillation under reduced pressure

(d)

steam distillation

Which techniqaes is based on the difference in the solubilities of the compound and the impurities in a suitable solvent?

(a)

Sublimation

(b)

Crystallisation

(c)

Distillation

(d)

None of these

10.

Write the correct IUPAC name of the following.

(a)

1-chloro-2, 4- dinitrobenzene

(b)

6-chloro-1, 3- dinitrobenzene

(c)

1-chloro-4, 6-dinitrobenzene

(d)

2-chloro-1, 5-dinitrobenzene

11.

What is the correct IUPAC name of the following?

(a)

3-ethyl-1,1-dimethylcyclohexane

(b)

t-ethyl- 3,3-dimethylcyclohexane

(c)

1,1-dimethyl-3-ethylcyclohexane

(d)

None of the above

12.

The structure of iso-butyl group in an organic compound is ______.

(a)

(b)

CH₃-CH₂-CH₂-CH₃

(c)

CH₃-CH₂-CH₂-CH₂-

(d)

13.

Correct IUPAC name for H₃C ______.

(a)

2-ethyl-3-methylpentane

(b)

3, 4-dimethylhexane

(c)

2-sec-butylbutane

(d)

2, 3-dimethylbutane

14.

Which type of compound is shown by the following structure ______.

(a)

Alicyclic compound

(b)

Benzenoid aromatic compound

(c)

Non-benzenoid aromatic compound

(d)

Acyclic compound

15.

Outer electronic configuration off-block elements is ______.

(a)

\((n+1) f^{1-14}(n-1) d^{0-1} n s^{2}\)

(b)

\((n-2) f^{1-14}(n+1) d^{0-1} n s^{2}\)

(c)

\((n-2) f^{1-14}(n-1) d^{0-1} n s^{2}\)

(d)

None of the above

16.

According to IUPAC,total number of groups and periods in the periodic table respectively are ______.

(a)

16, 9

(b)

18, 7

(c)

18, 9

(d)

13, 7

17.

The outermost electronic configuration of p-block elements varies from ns²np¹ to ______.

(a)

\(n s^{2} n p^{5}\)

(b)

\(n s^{2} n p^{4}\)

(c)

\(n s^{2} n p^{6}\)

(d)

\(n s^{2} n p^{3}\)

18.

Out of the four blocks in which periodic table is divided, helium belongs which block?

(a)

s-block

(b)

p-block

(c)

d-block

(d)

f-block

19.

Elements are classified into four blocks like s-block, p-block, d-block and f-block on the basis of ______.

(a)

atomic number

(b)

atomic mass

(c)

atomic orbitals

(d)

All of these

20.

The elements in which electrons are progressively filled in 4f-orbital are called______.

(a)

actinoids

(b)

transition elements

(c)

lanthanoids

(d)

halogens

21.

General outer electronic configuration of d-block elements is _____.

(a)

\((n-1) d^{1-10} n s^{3}\)

(b)

\((n+1) d^{1-10} n s^{0-2}\)

(c)

\((n-1) d^{1-10} n s^{0-2}\)

(d)

\((n-1) d^{0} n s^{0-2}\)

22.

The electronic configuration of gadolinium (Atomic number 64) is _____.

(a)

[Xe] 4f³ 5d⁵6s²

(b)

[Xe] 4f⁷ 5d² 6s¹

(c)

[Xe] 4f⁷ 5d¹ 6s²

(d)

[Xe] 4f⁸ 5d⁶ 6s²

23.

Predict the position of an element having the electronic configuration \(1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 3 d^{5} 4 s^{1}\) _____.

(a)

Period 4, group 6

(b)

Period 6, group 4

(c)

Period 3, group 1

(d)

Period 4, group 5

24.

Periodic classification of elements can be done on the basis of electronic configuration and is used to examine the _____.

(a)

periodic trends in physical properties of elements

(b)

periodic trends in chemical properties of elements

(c)

Both (a) and (b)

(d)

None of the above

25.

The period number in the long form of the periodic table is equal to _____.

(a)

magnetic quantum number of any element of the period

(b)

atomic number of any element of the period

(c)

maximum principal quantum number of any element of the period

(d)

maximum azimuthal quantum number of any element of the period

26.

Which of the following statements is incorrect?

(a)

Mendeleev's arranged elements in horizontal rows and vertical columns

(b)

Mendeleev's arranged elements in order of their increasing atomic number

(c)

Mendeleev's system of classifying elements was more elaborate than that of Lother Meyer

(d)

None of the above

27.

Which important property did Mendeleev use to classify the elements in his periodic table?

(a)

Atomic weight

(b)

Atomic number

(c)

Melting point

(d)

None of these

28.

What will be the molarity of pure water?

(a)

18 M

(b)

50.0 M

(c)

55.6 M

(d)

100 M

29.

Which law states that if two elements can combine to form more than one compound, the masses of one element that combine with a fixed mass of other element, are in the ratio of small whole numbers?

(a)

Avogadro's law

(b)

Law of definite composition

(c)

Law of multiple proportions

(d)

Gay Lussac's law of gaseous volumes

30.

X g of Ag was dissolved in HNO3 and the solution was treated with excess of NaCl, when 2.87g of AgCl was precipitated. The value of x is _______.

(a)

1.08 g

(b)

2.16 g

(c)

2.70 g

(d)

1.62g

31.

What will be the molality of the solution made by dissolving 10 g of NaOH in 100 g of water?

(a)

2.5 m

(b)

5 m

(c)

10 m

(d)

1.25 m

32.

What is the mass per cent of carbon in carbon dioxide?

(a)

0.034%

(b)

27.27%

(c)

3.4%

(d)

28.7%

33.

An organic compound containing C,Hand O has 49.3%carbon, 6.84% hydrogen and its vapour density is 73. Molecular formula of the compound is _______.

(a)

C₃H₅O₂

(b)

C₄H₁₀O₂

(c)

C₆H₁₀O₄

(d)

C₃H₁₀O₂

34.

An organic compound containing C and H has 92.3%of carbon, its empirical formula is _______.

(a)

(b)

CH₃

(c)

CH₂

(d)

CH₄

35.

Which of the following statements is correct about the reaction given below?
\({ }_{4 \mathrm{Fe}}(s)+30_{2}(g) \longrightarrow 2 \mathrm{Fe}_{2} \mathrm{O}_{3}(g)\)

(a)

Total mass of iron and oxygen in reactants = total mass of iron and oxygen in product therefore it follows law of conservation of mass.

(b)

Total mass of reactants = total mass of product, therefore, law of multiple proportions is followed

(c)

Amount of Fe₂O₃ can be increased by taking anyone of the reactants (iron or oxygen) in excess

(d)

Amount of Fe₂O₃ produced will decrease if the amount of anyone of the reactants (iron or oxygen) is taken in excess.

36.

A student performs a titration with different burettes and finds titre values of 25.2 mL, 25.25 mL and 25.0 mL. The number of significant figures in the average titre value is _______.

(a)

(b)

(c)

(d)

37.

Which of the following statements about a compound is incorrect?

(a)

A molecule of a compound has atoms of different elements

(b)

A compound cannot be separated into its constituent elements by physical methods of separation

(c)

A compound retains the physical properties of its constituent elements

(d)

The ratio of atoms of different elements in a compound is fIxed

38.

Which of the following are electrophiles?

(a)

Dimethyl sulphide

(b)

Bromides

(c)

Carbon dioxide

(d)

Ammonia

39.

The hybridization state of a carbocation is ______.

(a)

Sp⁴

(b)

sp³

(c)

sp²

(d)

40.

The bond that undergoes heterolytic cleavage most readily is ______.

(a)

C-C

(b)

C-O

(c)

C-H

(d)

O-H

41.

The IUPAC name of ______.

(a)

2-methyl butanal

(b)

butan-2-aldehyde

(c)

2-ethylpropanal

(d)

3-methyl isobutraldehyde

42.

The IUPAC name of ______.

(a)

1, 2-dichloropropane

(b)

3, 3-dichloropropane

(c)

1, 1-dichloropropane

(d)

dichloropropane

43.

The reaction: CH₃CH₂I + KOH_(aq) \(\rightarrow\)CH₃CH₂OH + KI is classified as :________.

(a)

electrophilic substitution

(b)

nucleophilic substitution

(c)

elimination

(d)

addition

44.

Which of the following carbocation is most stable ?

(a)

\(({ CH }_{ 3 })_{ 3 }C.\overset {+ }{ C } { H }_{ 2 }\)

(b)

\(\left( { CH }_{ 3 } \right) _{ 3 }\overset { + }{ C } \)

(c)

\({ CH }_{ 3 }{ CH }_{ 2 }\overset { +}{ C } { H }_{ 2 }\)

(d)

\({ CH }_{ 3 }\overset {+ }{ C } HC{ H }_{ 2 }{ CH }_{ 3 }\)

45.

In the Lassaigne’s test for nitrogen in an organic compound, the Prussian blue colour is obtained due to the formation of: ______.

(a)

Na₄[Fe(CN)₆]

(b)

Fe₄[Fe(CN)₆]₃

(c)

Fe₂[Fe(CN)₆]

(d)

Fe₃[Fe(CN)₆]₄

46.

In the organic compound CH₂=CH-CH₂-CH₂-C\(\equiv \)CH, the pair of hydridised orbitals involved in the formation of: C₂ - C₃ bond is _____.

(a)

sp - sp²

(b)

sp - sp³

(c)

Sp²- Sp³

(d)

sp³ - sp³

47.

What is the electronic configuration of the elements of group 14?

(a)

ns² np⁴

(b)

ns²np⁶

(c)

ns² np²

(d)

ns²

48.

The number of significant figures in 0.0101 is _______.

(a)

(b)

(c)

(d)

49.

Which of the following has the highest mass?

(a)

1 g atom of C

(b)

\(\frac { 1 }{ 2 } \)mole of CH₄

(c)

10 mL of water

(d)

3.011 x 10²³atoms of oxygen

50.

One mole of CO₂ contains _______.

(a)

6.02 x 10²³atoms of C

(b)

3 g of CO₂

(c)

6.02 x 10²³atoms of O

(d)

18.1 x 10²³ molecules of CO₂

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Answers Key:

Multiple Choice Question

50 x 1 = 50

(b)
The d-block has 8 columns, because a maximum of 8 electrons can occupy all the orbitals in a d-subshell.

Statement (b) is incorrect.
The d-block has 10 columns because a maximum of 10 electrons can occupy all the orbitals in a d subshell.

(b)
\((n-1) d^{1-10} n s^{0-2}\)

(a)
6.022 x 10²³ molecules of oxygen

(d)
82.0%

(a)
To separate different fractions of crude oil in petroleum industry

(d)
steam distillation

(b)
Crystallisation

10.

(a)
1-chloro-2, 4- dinitrobenzene

11.

(a)
3-ethyl-1,1-dimethylcyclohexane

12.

13.

(b)
3, 4-dimethylhexane

14.

(b)
Benzenoid aromatic compound

15.

16.

(b)
18, 7

17.

18.

(b)
p-block

19.

20.

21.

22.

23.

(a)
Period 4, group 6

24.

25.

26.

(b)
Mendeleev's arranged elements in order of their increasing atomic number

27.

(a)
Atomic weight

28.

29.

30.

(b)
2.16 g

31.

(a)
2.5 m

32.

(b)
27.27%

33.

34.

(a)
CH

35.

(a)
Total mass of iron and oxygen in reactants = total mass of iron and oxygen in product therefore it follows law of conservation of mass.

36.

37.

38.

(a)
Dimethyl sulphide

39.

40.

(d)
O-H

41.

42.

43.

(b)
nucleophilic substitution

44.

(b)
\(\left( { CH }_{ 3 } \right) _{ 3 }\overset { + }{ C } \)

45.

(b)
Fe₄[Fe(CN)₆]₃

46.

47.

48.

(a)
3

49.

(a)
1 g atom of C

50.

(a)
6.02 x 10²³atoms of C

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

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Std: 11th Standard CBSE - Chemistry

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

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Questions:

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Answers Key:

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