Extra 40 Multiple Choice Questions (MCQs) with answers from Chapter:4 Carbon and its Compounds for Class 10 CBSE Science:

 

Carbon belongs to which group in the periodic table?

 

a) Group 12

 

b) Group 14

 

c) Group 16

 

d) Group 18

 

Ans:

(b) Group 14

 

Carbon has how many valence electrons?

 

a) 2

 

b) 4

 

c) 6

 

d) 8

 

Ans:

(b) 4

 

The property of carbon to form long chains is called:

 

a) Catenation

 

b) Isomerism

 

c) Polymerization

 

d) Hybridization

 

Ans:

(a) Catenation

 

Which of the following is NOT an allotrope of carbon?

 

a) Diamond

 

b) Graphite

 

c) Fullerene

 

d) Quartz

 

Ans:

(d) Quartz

 

Which type of bond is present in a diamond?

 

a) Ionic bond

 

b) Covalent bond

 

c) Metallic bond

 

d) Hydrogen bond

 

Ans:

(b) Covalent bond

 

Diamond is:

 

a) Good conductor of electricity

 

b) Bad conductor of electricity

 

c) Both good and bad conductor

 

d) Amphoteric in nature

 

Ans:

(b) Bad conductor of electricity

 

Graphite is a good conductor of electricity due to the presence of:

 

a) Free protons

 

b) Free electrons

 

c) Free neutrons

 

d) Free molecules

 

Ans:

(b) Free electrons

 

Which of the following is a saturated hydrocarbon?

 

a) Ethene

 

b) Ethyne

 

c) Ethane

 

d) Benzene

 

Ans:

(c) Ethane

 

The general formula of alkanes is:

 

a) CnH2n

 

b) CnH2n+2

 

c) CnH2n-2

 

d) CnH2nO2

 

Ans:

(b) CnH2n+2

 

The IUPAC name of CH4 is:

 

a)

Methane

 

b) Methane

 

c) Methanol

 

d)

Methanolic

acid

 

Ans:

(b) Methane

 

The functional group present in alcohols is:

 

a) -OH

 

b) -COOH

 

c) -CHO

 

d) -CO-

 

Ans:

(a) -OH

 

The molecular formula of ethene is:

 

a) C2H2

 

b) C2H4

 

c) C2H6

 

d) C3H6

 

Ans:

(b) C2H4

 

The IUPAC name of CH3COOH is:

 

a) Ethanol

 

b)

Methanolic

acid

 

c) Ethanoic acid

 

d) Acetone

 

Ans:

(c) Ethanoic acid

 

Which of the following hydrocarbons undergoes addition reaction?

 

a) Alkanes

 

b) Alkenes

 

c) Alkynes

 

d) Both (b) and (c)

 

Ans:

(d) Both (b) and (c)

 

The process of conversion of vegetable oil into vegetable ghee is known as:

 

a) Oxidation

 

b) Hydrogenation

 

c) Reduction

 

d) Fermentation

 

Ans:

(b) Hydrogenation

 

The functional group present in aldehydes is:

 

a) -CHO

 

b) -COOH

 

c) -OH

 

d) -CO-

 

Ans:

(a) -CHO

 

The simplest ketone is:

 

a) Formaldehyde

 

b) Acetone

 

c) Benzene

 

d) Ethanol

 

Ans:

(b) Acetone

 

The reaction of an alcohol with acetic acid forms:

 

a) An aldehyde

 

b) A ketone

 

c) An ester

 

d) An acid

 

Ans:

(c) An ester

 

Which property of carbon leads to a large number of organic compounds?

 

a) Isomerism

 

b) Catenation

 

c) Polymerization

 

d) All of these

 

Ans:

(d) All of these

 

Ethanol is also known as:

 

a) Acetone

 

b) Formaldehyde

 

c) Ethyl alcohol

 

d) Acetic acid

 

Ans:

(c) Ethyl alcohol

 

The reaction between an alcohol and carboxylic acid forms:

 

a) Ester

 

b) Aldehyde

 

c) Alcohol

 

d) Amine

 

Ans:

(a) Ester

 

Which gas is released when sodium reacts with ethanol?

 

a) Hydrogen

 

b) Oxygen

 

c) Carbon dioxide

 

d) Nitrogen

 

Ans:

(a) Hydrogen

 

The reaction of carboxylic acid with base forms:

 

a) Alcohol

 

b) Ester

 

c) Salt and water

 

d) Hydrocarbon

 

Ans:

(c) Salt and water

 

Methanol is also known as:

 

a) Methyl alcohol

 

b) Ethyl alcohol

 

c) Acetic acid

 

d) Propanol

 

Ans:

(a) Methyl alcohol

 

Soap is formed by the reaction of:

 

a) An acid and a base

 

b) An ester and a base

 

c) A salt and an acid

 

d) A metal and a non-metal

 

Ans:

(b) An ester and a base

 

The molecular formula of benzene is:

 

a) C6H12

 

b) C6H6

 

c) C5H10

 

d) C7H14

 

Ans:

(b) C6H6

 

Vinegar contains:

 

a) Acetic acid

 

b) Ethanol

 

c) Methanol

 

d) Acetone

 

Ans:

(a) Acetic acid

 

Hard water contains:

 

a) Calcium and Magnesium salts

 

b) Sodium and Potassium salts

 

c) Iron and Zinc salts

 

d) Copper and Lead salts

 

Ans:

(a) Calcium and Magnesium salts

 

Detergents are preferred over soap because:

 

a) They form scum in hard water

 

b) They work in soft water only

 

c) They work in hard water too

 

d) They do not dissolve in water

 

Ans:

(c) They work in hard water too

 

 

The process used to break down hydrocarbons into simpler molecules is:

 

a) Cracking

 

b) Combustion

 

c) Hydrogenation

 

d) Oxidation

 

Ans:

(a) Cracking

31. Which alcohol is used in hand sanitizers?

a) Methanol
b) Ethanol
c) Propanol
d) Butanol
Ans: (b) Ethanol

 

32. Which gas is evolved when carboxylic acids react with carbonates?

a) Hydrogen
b) Oxygen
c) Carbon dioxide
d) Nitrogen
Ans: (c) Carbon dioxide

 

33. Which compound is commonly called wood spirit?

a) Methanol
b) Ethanol
c) Acetone
d) Ethanoic acid
Ans: (a) Methanol

 

34. What is the common name for CH3-CH2-OH?

a) Methanol
b) Ethanol
c) Acetone
d) Ethanoic acid
Ans: (b) Ethanol

 

35. What is the molecular formula of methane?

a) CH4
b) C2H6
c) C3H8
d) C4H10
Ans: (a) CH4

 

36. What is the main component of Liquefied Petroleum Gas (LPG)?

a) Methane
b) Propane and Butane
c) Ethane and Pentane
d) Carbon monoxide
Ans: (b) Propane and Butane

 

37. Ethanoic acid gives what kind of smell?

a) Sweet
b) Vinegar-like
c) Rotten egg
d) Fruity
Ans: (b) Vinegar-like

 

38. Which reaction is called saponification?

a) Formation of soap
b) Formation of alcohol
c) Formation of ketone
d) Formation of aldehyde
Ans: (a) Formation of soap

 

39. What is the IUPAC name of Acetone?

a) Propanone
b) Ethanal
c) Butanol
d) Propanol
Ans: (a) Propanone

 

40. Which metal reacts with acetic acid to produce hydrogen gas?

a) Copper
b) Iron
c) Sodium
d) Gold
Ans: (c) Sodium