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Compounds and Mixtures - 1

Description: Compound and Mixture - 1
Number of Questions: 10
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Tags: Compound and Mixture - 1 Blood Relations Compounds and Mixtures Chemical Elements Classification of Materials
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Which of the following pure substances is a compound?

  1. Water

  2. Hydrogen

  3. Iron

  4. Mercury


Correct Option: A
Explanation:

Water is the purest substance in which hydrogen and oxygen combine with each other in a definite ratio, that is 1 : 8.

Which of the following is an element?

  1. Hydrogen chloride

  2. Carbon dioxide

  3. Helium

  4. Water


Correct Option: C
Explanation:

Helium is an element. Other options are compounds.

When two or more elements join together chemically,

  1. a compound is formed

  2. a heterogeneous mixture is formed

  3. a homogeneous mixture is formed

  4. a colloid is formed


Correct Option: A
Explanation:

When two or more elements join together chemically, a compound is formed. 

Which of the following substances has the maximum space between its particles at room temperature?

  1. Water

  2. Oxygen

  3. Stone

  4. Milk


Correct Option: B
Explanation:

Among the given options, oxygen (a gas) has the maximum space between its particles. 

Which of the following is a characteristic of a compound?

  1. Elements of a compound have the same composition and properties.

  2. Elements in a compound vary in composition.

  3. Properties of a compound differ from its constituent elements.

  4. Separation of a compound into its elements is not possible chemically.


Correct Option: C
Explanation:

The correct answer is option (3).

Which of the following will NOT break down compounds?

  1. Filtering

  2. Electric current

  3. Chemical change

  4. None of these


Correct Option: A
Explanation:

The correct answer is option (1).

Which of the following substances is/are impure? (i) Mixture (ii) Compounds (iii) Elements

  1. Only (i)

  2. Only (ii)

  3. Both (ii) and (iii)

  4. Both (i) and (ii)


Correct Option: A
Explanation:

The correct answer is option (1).

Elements _______ be broken into simpler substances by _________ reactions.

  1. can, physical

  2. can, chemical

  3. cannot, chemical

  4. can, physical and chemical


Correct Option: C
Explanation:

Elements cannot be broken into simpler substances by chemical reactions.

Which of the following is the smallest particle of matter?

  1. Mixture

  2. Compound

  3. Atom

  4. None of these


Correct Option: C
Explanation:

Atom is the smallest particle of matter. 

Which of the following examples of matter will neither have definite shape nor definite volume?

  1. Spoon

  2. Sugar

  3. Salt

  4. Oxygen


Correct Option: D
Explanation:

Gases have no definite volume or shape. 

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