R4RIN – MCQs, Mock Tests | CBES Board Class 10 Chemistry Hydrocarbons multiple choice questions set 1

When two carbon atoms share two electron pairs then they form

1. single bond
2. double bond
3. triple bond
4. coordinate covalent bond

✅ Correct Answer: 2

All are wrong about alkenes, but that they are

1. saturated hydrocarbons
2. soluble in water
3. unsaturated hydrocarbons
4. insoluble in organic solvents

✅ Correct Answer: 3

Loss of hydrogen halide is called

1. halogenation
2. dehydration
3. Dehydrohalogenation
4. hydrogenation

✅ Correct Answer: 3

Which of the following is given off during ripening fruits and vegetables?

1. ethane
2. ethene
3. Ethyne
4. methane

✅ Correct Answer: 2

Acetylene is also called

1. Ethyne
2. ethene
3. ethane
4. methane

✅ Correct Answer: 1

Oxy-acetylene torches can produce temperature as high as

1. 30 degrees
2. 300 degrees
3. 3000 degrees
4. 30000 degrees

✅ Correct Answer: 3

Oxy-acetylene torches can produce temperature as high as

1. 30 degrees
2. 300 degrees
3. 3000 degrees
4. 30000 degrees

✅ Correct Answer: 3

Oxy-acetylene torches can produce temperature as high as

1. 30 degrees
2. 300 degrees
3. 3000 degrees
4. 30000 degrees

✅ Correct Answer: 3

Chloroform is also called

1. chloromethane
2. dichloromethane
3. Trichloromethane
4. tetra chloromethane

✅ Correct Answer: 3

The molecular formula of ethane is

1. CH4
2. C2H6
3. C3H8
4. C4H10

✅ Correct Answer: 2

Which of the following is used as antifreeze in automobile radiators?

1. ethane
2. methane
3. lycopene
4. ethylene glycol

✅ Correct Answer: 4

What is the term used for the reaction of a substance with oxygen or air that causes the rapid release of heat and the appearance of a flame?

1. oxidation
2. combustion
3. burning
4. reduction

✅ Correct Answer: 2

In alkanes (saturated hydrocarbons) each carbon atom forms

1. 2 bonds
2. 4 bonds
3. 6 bonds
4. 8 bonds

✅ Correct Answer: 2

Which of the following is used as an anesthetic?

1. dichloromethane
2. tetra chloromethane
3. methyl chloride
4. chloroform

✅ Correct Answer: 4

How does chlorine react?

1. explosively
2. slowly in dark but rapidly in strong sunlight
3. requires high temperature or strong sun light
4. essentially unreactive

✅ Correct Answer: 2

Which of the following are saturated hydrocarbons?

1. alkanes
2. alkenes
3. alkynes
4. alkyl radicals

✅ Correct Answer: 1

How does iodine react?

1. explosively
2. slowly in dark but rapidly in strong sunlight
3. equires high temperature or strong sun light
4. essentially unreactive

✅ Correct Answer: 4

Which of the following is not true about lighter alkanes?

1. their combustion can be controlled
2. they produce large amount of heat per gram
3. they are expensive and rare
4. they are widely used as fuel

✅ Correct Answer: 3

What is the color of the flame with which most alkanes burn?

1. orange
2. yellow
3. red
4. blue

✅ Correct Answer: 4

What type of reaction do alkynes undergo across the triple bond?

1. elimination reaction
2. substitution reaction
3. addition reaction
4. halogenation

✅ Correct Answer: 3

What is produced by the complete combustion of an alkane?

1. carbon dioxide and water
2. carbon dioxide, water and heat
3. carbon monoxide, carbon and water
4. hydrogen and carbon dioxide

✅ Correct Answer: 2

What is the physical state of higher alkanes?

1. solid
2. liquid
3. gas
4. plasma

✅ Correct Answer: 1

What is given by the incomplete combustion of methane?

1. carbon dioxide and water
2. carbon dioxide, water and heat
3. carbon monoxide, carbon and water
4. hydrogen and carbon dioxide

✅ Correct Answer: 3

The reaction in which one chlorine atom becomes attached with one carbon and the other one with other carbon atom is called

1. elimination reaction
2. substitution reaction
3. halogenation
4. addition reaction

✅ Correct Answer: 4

What is the term used for the process in which there is an addition of nascent hydrogen?

1. hydrogenation
2. dehydration
3. reduction
4. oxidation

✅ Correct Answer: 3

The simplest alkane is

1. butane
2. propane
3. methane
4. ethane

✅ Correct Answer: 3