Question Set B

CBSE 11th Chemistry Some Basic Concepts of Chemistry Model Questions Papers Study Material - QB365

Download CBSE Class 11th Standard CBSE Chemistry question papers, sample papers, important questions, and previous year solved papers in PDF format. Get free study materials, NCERT solutions, and exam preparation resources for Class 11th Standard CBSE Chemistry

Questions:

Multiple Choice Question

90 x 1 = 90

Hydrocolloid carrageen is obtained from:

(a)

Phaeophyceae and Rhodophyceae

(b)

Rhodophyceac only

(c)

Phaeophyceae only

(d)

Chlorophyceae and Phaeophyceae

Which of the following statements is correct ?

(a)

Some of the organisms can fix atmospheric nitrogen in specialized cells called sheath cells.

(b)

Fusion of two cells is called Karyògamy.

(c)

Fusion of protoplasms between two motile on non-motile gametes is called plasmogamy.

(d)

Organisms that depend on living plants are called saprophytes.

Which of the following correct about viroids?

(a)

They have free RNA without protein coat.

(b)

They have DNA with protein coat.

(c)

They have free DNA without protein coat.

(d)

They have RNÀ with protein coat.

Identify the correct order of reactivity towards electrophilic substitution reaction.

(a)

1 > 2 > 3 > 4

(b)

4 > 3 < 2 > 1

(c)

2 > 1 > 3 > 4

(d)

2 > 3 > 1 > 4

Electrophile that participates in sulphonation of benzene is ______.

(a)

SO₃H

(b)

SO₂

(c)

SO₃

(d)

\(\mathrm{SO}_{3}^{-}\)

In which of the following, all atoms are coplanar?

(a)

(b)

(c)

(d)

Four structures are given in options (a) to (d). Examine them and select the aromatic structures.

(a)

(b)

(c)

(d)

Which are the correct IUPAC names of the following compound?

(a)

5- Butyl - 4- isopropyldecane

(b)

5- Ethyl- 4- propyldecane

(c)

5- sec-Butyl- 4- iso-propyldecane

(d)

4-(1-methylethyl)- 5 - (1-methylpropyl)-decane

Which of the following alkenes on ozonolysis give a mixture of ketones only?

(a)

\(\mathrm{CH}_{3} \longrightarrow \mathbf{C H}=\mathrm{CH}-\mathrm{CH}_{3}\)

(b)

(c)

(d)

10.

Arrange the following carbanions in order of their decreasing stability.
\((A) \mathbf{H}_{3} \mathbf{C}-\mathbf{C} \equiv \mathbf{C}^{-} \ (B) \mathbf{H}-\mathbf{C} \equiv \mathbf{C}^{-} \ (C) \mathrm{H}_{3} \mathrm{C}-\mathrm{C}^{-} \mathrm{H}_{2}\)

(a)

A > B > C

(b)

B > A > C

(c)

C > B > A

(d)

C > A > B

11.

The addition of HBr to I-butene gives a mixture of products A, Band C

\(\begin{aligned} \mathbf{C H}_{3}-\mathbf{C H}_{2}-\mathbf{C H}_{2}-\mathbf{C H}_{2}-\mathbf{B r}\\ \text { (C) }\quad \quad \quad \quad \quad \quad \end{aligned}\) The mixture consists of ______.

(a)

A and B as major and C as minor products

(b)

B as major, A and C as minor products

(c)

B as minor, A and C as major products

(d)

A and B as minor and C as major products

12.

Which of the following is most reactive?

(a)

(b)

(c)

(d)

13.

Which of the following compounds will exhibit geometrical isomerism?

(a)

2-Phenyl-1-butene

(b)

1, 1-Diphenyl propane

(c)

1-Phenyl-2-butene

(d)

3-phenyle butane

14.

Phenyl magnesium bromide reacts with methanol to give ______.

(a)

Benzene

(b)

Toluene

(c)

Phenol

(d)

Arisole

15.

Sodium nitroprusside reacts with sodium sulphide formed in lassaigne's test to detect presence of sulphur gives violet colour due to _______.

(a)

Na₂[Fe(CN)₅NO]

(b)

Na₄[Fe(CN)₅NOS]

(c)

Na₂[Fe(CN)₅COS]

(d)

None of these

16.

Which one of the following has the most nucleophilic nitrogen?

(a)

(b)

(c)

(d)

17.

The IUPAC name of the molecule _______.

(a)

4-oxo-2,3-dimethyl pent-2-en-1-oic acid

(b)

2-carboxy-3-methyl pent-2-en -3-one

(c)

4-carboxy-3-methyl pent-3-en-2-one

(d)

2,3-Dimethyl-4-oxo-pent-2-en-1-oic acid

18.

In Dumas method, 0.25g of organic compound gave 40 ml of N₂ at 300k and 725mm pressure. If aqueous tension at 300k is 25mm, the percentage of nitrogen in compound is _______.

(a)

16.76%

(b)

15.76%

(c)

17.36%

(d)

18.20%

19.

Glycerol is purified by _______.

(a)

Vacuum distillation

(b)

Simple distillation

(c)

Steam distillation

(d)

Fractional distillation

20.

Consider the following compounds.

Hyper conjugation occurs in _______.

(a)

III

(b)

I and II

(c)

(d)

21.

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

22.

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

23.

1 g of M₂CO₃ on treatment with excess HCl produces 0.01186 moles of CO₂. The molar mass of M₂CO₃ in g mol^-1is _______.

(a)

1186

(b)

84.3

(c)

118.6

(d)

11.86

24.

A mixture of 24 dm³ of hydrogen and 100 dm³ of oxygen was ignited and the reaction mixture was cooled to room temperature and pressure. What will be volume of gases remaining of the end of the reaction?

(a)

24 dm³

(b)

76 dm³

(c)

88 dm³

(d)

112 dm³

25.

16 g of oxygen has same number of molecules as in _______.

(a)

16 g of CO

(b)

28 g of N₂

(c)

14 g of N₂

(d)

1.0 g of H₂

26.

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%

27.

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

28.

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

29.

Which of the following deactivates the benzene ring towards electrophilic substitution and is o/p directing?

(a)

\(-\mathrm{Cl}^{\ominus}\)

(b)

-OCR₃

(c)

-CHO

(d)

All of these

30.

Which of the following correctly explains the stability of benzene molecule?

(a)

Conjugation

(b)

Resonance

(c)

Unsaturation

(d)

Hybridisation

31.

Which of the following organic materials damage DNA of our body?

(a)

Tobacco

(b)

Coal

(c)

Petroleum

(d)

All of these

32.

\(+\text { Conc. } \mathrm{HNO}_{3}+\text { Conc. } \mathrm{H}_{2} \mathrm{SO}_{4} \stackrel{(323-333) \mathrm{K}}{\longrightarrow}\) Here, A refers to ______.

(a)

(b)

(c)

(d)

All of these

33.

Attack of electrophile on benzene results in the formation of ______.

(a)

σ complex

(b)

arenium ion

(c)

π complex

(d)

Both (a) and (b)

34.

The geometry of ethyne molecule is ______.

(a)

linear

(b)

trigonal planar

(c)

tetrahedral

(d)

bent

35.

In the reaction,
______.

(a)

CH₂= CH₂

(b)

CH₃CH₃

(c)

CH \(\equiv\) CH

(d)

Both (a) and (b)

36.

2-methyl propan-2-ol is obtained by the reaction of X with water in the presence of cone. H₂SO₄ The X is ______.

(a)

1-methylpropene

(b)

2,2-dimethylhexane

(c)

2-methylpropene

(d)

2-methylbutane

37.

Which of the following exhibit geometrical isomerism?

(a)

2-methylpropene

(b)

But-1-ene

(c)

But-2-ene

(d)

2, 3-dibromo-but-2-ene

38.

Consider the following reaction, \(\mathrm{CaC}_{2}+\mathrm{H}_{2} \mathrm{O} \longrightarrow X\) Here X refers to ______.

(a)

ethene

(b)

ethyne

(c)

methyne

(d)

None of these

39.

The correct IUPAC name of the given structure

(a)

2-methylbut-1-yne

(b)

I-methylbut-3-yne

(c)

2-methylbut-3-yne

(d)

3-methylbut-1-yne

40.

Arrange the following alkyl halides in decreasing order of the rate of β - elimination reaction with alcoholic KOH.
(A)

(B) CH₃ - CH₂ - Br
(C) CH₃ - CH_{2 -}CH₂ - Br

(a)

A > B > C

(b)

C > B > A

(c)

B > C > A

(d)

A > C > B

41.

The IUPAC name of

(a)

2-methylbutene

(b)

1-methylpropene

(c)

2-methylbut-2-ene

(d)

2-methylprop-1-ene

42.

Eclipsed and the staggered conformations can be represented by ______.

(a)

Sawhorse projection

(b)

Newman projection

(c)

Both (a) and (b)

(d)

None of these

43.

How many chain isomers can be formed by butane?

(a)

One

(b)

Three

(c)

Two

(d)

Four

44.

The given structures,
and CH₃CH₂CH₂CH₃ are ______.

(a)

conformational isomers

(b)

chain isomers

(c)

position isomers

(d)

functional isomers

45.

The carbocation stability is: \(\stackrel{+}{\mathrm{C}} \mathrm{H}_{3}<\mathrm{CH}_{3} \mathrm{C}^{+} \mathrm{H}_{2}<\left(\mathrm{CH}_{3}\right)_{2} \stackrel {+}{\mathrm{C}} \mathrm{H}<\left(\mathrm{CH}_{3}\right)_{3} \mathrm{C}\) and alkyl radical stability is _______.

(a)

\(\dot{\mathrm{C}} \mathrm{H}\left(\mathrm{CH}_{3}\right)_{2}<\dot{\mathrm{CH}}_{3}<\dot{\mathrm{C}} \mathrm{H}_{2} \mathrm{CH}_{3}<\dot{\mathrm{C}}\left(\mathrm{CH}_{3}\right)_{3}\)

(b)

\(\stackrel{\circ}{\mathrm{C}}\left(\mathrm{CH}_{3}\right)_{3}<\dot{\mathrm{CH}}\left(\mathrm{CH}_{3}\right)_{2}<\dot{\mathrm{CH}}_{3}<\dot{\mathrm{CH}}_{2} \mathrm{CH}_{3}\)

(c)

\(\dot{\mathrm{C}}\left(\mathrm{CH}_{3}\right)_{3}<\dot{\mathrm{CH}}\left(\mathrm{CH}_{3}\right)_{2}<\dot{\mathrm{CH}}_{2} \mathrm{CH}_{3}<\dot{\mathrm{CH}}_{3}\)

(d)

\(\dot{\mathrm{C}} \mathrm{H}_{3}<\dot{\mathrm{C}} \mathrm{H}_{2} \mathrm{CH}_{3}<\dot{\mathrm{CH}}\left(\mathrm{CH}_{3}\right)_{2}<\dot{\mathrm{C}}\left(\mathrm{CH}_{3}\right)_{3}\)

46.

In Duma's method for estimation of nitrogen, 0.3 g of an organic compound gave 50 mL of nitrogen. collected at 300K temperature and 715 mm pressure. The percentage composition of nitrogen in the compound (Aqueous tension at 300K = 15mm) is _______.

(a)

15.46%

(b)

17.46%

(c)

18.36%

(d)

28%

47.

In Carius method of estimation of halogens, 250 mg of an organic compound gave 141 mg of AgBr. The percentage of bromine in the compound is_______. (atomic mass Ag = 108 and Br = 80)

(a)

(b)

(c)

(d)

48.

The elements always present in organic compounds are C and H. In addition to these, name the other elements that may be present in it ______.

(a)

Oxygen and nitrogen

(b)

Sulphur and halogens

(c)

Phosphorus

(d)

All of these

49.

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

50.

During hearing of a court case, the judge suspected that some changes in the documents had been carried out. He asked the forensic department to check the ink used at two different places. According to you which technique can give the best results?

(a)

Column chromatography

(b)

Solvent extraction

(c)

Distillation

(d)

Thin layer chromatography

51.

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

(a)

chromatography

(b)

sublimation

(c)

fractional distillation

(d)

distillaltion under reduced pressure

52.

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

53.

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

54.

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

55.

Electrophilic addition reactions proceed in two steps. The first step involves the addition of an electrophile. Name the type of intermediate formed in the first step of the following addition reaction.
\(\mathrm{H}_{3} \mathrm{C}-\mathrm{HC}=\mathrm{CH}_{2}+\mathrm{H}^{+} \longrightarrow \text { ? }\)

(a)

2° carbanion

(b)

1° carbocation

(c)

2° carbocation

(d)

1° carbanion

56.

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

57.

The following compounds show

(a)

configuration isomerism

(b)

conformational isomerism

(c)

structural isomerism

(d)

stereoisomerism

58.

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

59.

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

(a)

Alcohols

(b)

Aldehydes

(c)

Alkyl halides

(d)

Cyanides

60.

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

61.

The correct way(s) of representing 2-bromobutane is/are ______.

(a)

CH₃CHBrCH₂CH₃

(b)

(c)

(d)

All of the above

62.

In which of the following ways the structure(s) of organic compounds is/are represented?

(a)

Lewis or dot structure

(b)

Dash structure

(c)

Condensed and bond-line structure

(d)

All of the above

63.

In cyclic compounds, the bond-line formula for chlorocyclohexane is represented by which of the following representations?

(a)

(b)

(c)

(d)

64.

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

65.

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

66.

A bivalent metal has an equivalent mass of 32. The molecular mass of the metal nitrate is _______.

(a)

182

(b)

168

(c)

192

(d)

188

67.

18.72 g of a substance X occupies 1.81 cm³. What will be its density measured in correct significant figures?

(a)

10.3g/cm³

(b)

10.34g/cm³

(c)

10.4g/cm³

(d)

10.3425g/cm³

68.

Which of the following statements is/are correct regarding significant figures?

(a)

All non-zero digits are significant

(b)

Significant figures are meaningful digits which are known with certainty

(c)

Significant figures are meaningful digits which are known with certainty

(d)

All of the above

69.

The weight of iron which will be converted into its oxide (Fe ₃O₄) by the action of 18 g of steam on it will be (Atomic weight of Fe = 56) _______.

(a)

168 g

(b)

84 g

(c)

42 g

(d)

21 g

70.

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%

71.

The concentration of a solution or the amount of substance present in its given volume can be expressed in which of the following ways?

(a)

Mass per cent or weight per cent (w/w%)

(b)

Mole fraction or molarity

(c)

Molality

(d)

All of the above

72.

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

73.

If the concentration of glucose (C₆H₁₂O₆) in blood is 0.9 g L^{- 1}, what will be the molarity of glucose in blood?

(a)

5 M

(b)

50 M

(c)

0.005 M

(d)

0.5 M

74.

What will be the molarity of a solution, which contains 5.85 g of NaCI(s) per 500 mL?

(a)

4 mol L^{- 1}

(b)

20 mol L^-1

(c)

0.2 mol L^-1

(d)

2 mol L^-1

75.

Which of the following equations is unbalanced?

(a)

\(4 \mathrm{Fe}(s)+3 \mathrm{O}_{2}(g) \longrightarrow 2 \mathrm{Fe}_{2} \mathrm{O}_{3}(s)\)

(b)

\(2 \mathrm{Mg}(s)+\mathrm{O}_{2}(g) \longrightarrow 2 \mathrm{MgO}(s)\)

(c)

\(\mathrm{P}_{4}(s)+\mathrm{O}_{2}(g) \longrightarrow \mathrm{P}_{4} \mathrm{O}_{10}(s)\)

(d)

\(\mathrm{CH}_{4}(\mathrm{~g})+2 \mathrm{O}_{2}(g) \longrightarrow \mathrm{CO}_{2}(g)+2 \mathrm{H}_{2} \mathrm{O}(g)\)

76.

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

77.

An organic compound on analysis was found to contain 10.06% carbon, 0.84% hydrogen and 89.10% chlorine. What will be the empirical formula of the substance?

(a)

CH₂Cl₂

(b)

CHCl₃

(c)

CCl₄

(d)

CH₃CI

78.

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

79.

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

80.

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

81.

The empirical formula of a compound is CH₂. One mole of this compound has a mass of 42 g. Its molecular formula is _______.

(a)

C₃H₆

(b)

C₃H₈

(c)

CH₂

(d)

C₂H₂

82.

The number of atoms present in one mole of an element is equal to Avogadro number. Which of the following element contains the greatest number of atoms?

(a)

4 g He

(b)

46 g Na

(c)

0.40 g Ca

(d)

12 g He

83.

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.

84.

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

85.

Two students performed the same experiment separately and each one of them recorded two readings of mass which are given below. Correct reading of mass is 3.0 g. On the basis of given data, mark the correct option out of the following statements.

students		Readinds
	(i)	(ii)
A	3.01	2.99
B	3.05	2.95

(a)

Results of both the students are neither accurate nor precise

(b)

Results of student A are both precise and accurate

(c)

Results of student B are neither precise nor accurate

(d)

Results of student B are both precise and accurate

86.

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

87.

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

(a)

2-Butene

(b)

2-Butyne

(c)

1-Butene

(d)

2-Butanol

88.

The hybridization state of a carbocation is ______.

(a)

Sp⁴

(b)

sp³

(c)

sp²

(d)

89.

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

90.

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

Visit QB365-SLMS - https://www.qb365.in/slms/

Answers Key:

Multiple Choice Question

90 x 1 = 90

(b)
Rhodophyceac only

(a)
They have free RNA without protein coat.

10.

(b)
B > A > C

11.

(a)
A and B as major and C as minor products

12.

13.

14.

(a)
Benzene

15.

(b)
Na₄[Fe(CN)₅NOS]

16.

17.

(d)
2,3-Dimethyl-4-oxo-pent-2-en-1-oic acid

18.

(a)
16.76%

19.

(a)
Vacuum distillation

20.

(a)
III

21.

(b)
7.10 g

22.

(a)
6.022 x 10²³ molecules of oxygen

23.

(b)
84.3

24.

25.

26.

(d)
82.0%

27.

(a)
Atoms in mole of CH₄

28.

(b)
XCI₂

29.

(a)
\(-\mathrm{Cl}^{\ominus}\)

30.

(b)
Resonance

31.

(d)
All of these

32.

(d)
All of these

33.

(d)
Both (a) and (b)

34.

(a)
linear

35.

(a)
CH₂= CH₂

36.

37.

38.

(b)
ethyne

39.

(d)
3-methylbut-1-yne

40.

(d)
A > C > B

41.

(d)
2-methylprop-1-ene

42.

43.

44.

(b)
chain isomers

45.

(d)
\(\dot{\mathrm{C}} \mathrm{H}_{3}<\dot{\mathrm{C}} \mathrm{H}_{2} \mathrm{CH}_{3}<\dot{\mathrm{CH}}\left(\mathrm{CH}_{3}\right)_{2}<\dot{\mathrm{C}}\left(\mathrm{CH}_{3}\right)_{3}\)

46.

(b)
17.46%

47.

(a)
24

48.

(d)
All of these

49.

50.

(d)
Thin layer chromatography

51.

(d)
distillaltion under reduced pressure

52.

(b)
Crystallisation

53.

(a)
resonance energy

54.

(b)
IV < IIl < II < I

55.

56.

(a)
II > I > III

57.

58.

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

59.

60.

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

61.

(d)
All of the above

62.

(d)
All of the above

63.

64.

(b)
HO(CH₂)₃ CH(CH₃ )CH(CH₃)₂

65.

(a)
Covalent bond

66.

(d)
188

67.

(b)
10.34g/cm³

68.

(d)
All of the above

69.

70.

71.

(d)
All of the above

72.

(a)
2.5 m

73.

74.

75.

76.

(b)
M₂O₃

77.

(b)
CHCl₃

78.

79.

(b)
55.95

80.

81.

(a)
C₃H₆

82.

(d)
12 g He

83.

(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.

84.

(a)
4.7 g

85.

(b)
Results of student A are both precise and accurate

86.

87.

(a)
2-Butene

88.

89.

90.

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

CBSE 11th Chemistry Some Basic Concepts of Chemistry Model Questions Papers Study Material - QB365 Set B

QB365 Student Learing Managemnet System

Std: 11th Standard CBSE - Chemistry

chapter: Some Basic Concepts of Chemistry - Model Questions Papers

Visit QB365-SLMS - https://www.qb365.in/slms/ Complete Questions and Answers

Questions:

Visit QB365-SLMS - https://www.qb365.in/slms/

Answers Key:

NEW MCQ Practice Test - CBSE Class 11

Chemistry CBSE Class 11 MCQ Practice Test

CBSE Class 11 MCQ Practice Test

11th Standard CBSE Study Materials