Tag: chemistry

Questions Related to chemistry

Which of the following is an example of a mixture?

chemistry mix and separate different types of mixtures homogenous and heterogenous mixtures all about mixtures

  1. Sugar

  2. Brass

  3. ${ CO } _{ 2 }$

  4. ${ NO } _{ 2 }$

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Correct Option: B
Explanation:

Brass is an alloy made up of copper and zinc and the proportions of copper and zinc can be varied to create a range of brasses with varying properties.So it is a mixture.

Some examples of matter and their groups are given in column P and Q respectively.

P Q
(a) Air (i) Molecule
(b) $O _2$ (ii) Mixture
(c) Copper sulphate (iii) Base
(d) Sodium hydroxide (iv) Salt

The correct option is :

chemistry mix and separate different types of mixtures homogenous and heterogenous mixtures all about mixtures

  1. a - (ii), b - (iv), c - (i), d - {iii)

  2. a - (iv), b - (iii), c - (ii), d - (i)

  3. a - (i), b - (ii), c - (iii), d - (iv)

  4. a - (ii) , b - (i), c - (iv), d - (iii)

Show answer
Correct Option: D
Explanation:

(a) Air is a mixture of several gases that are invisible and odorless. It consists of about 78% nitrogen, 21% oxygen, and less than 1% of argon, carbon dioxide, and other gases.

(b) Oxygen (O) is a chemical element (atomic number 8). It is a member of the chalcogen group on the periodic table and is a highly reactive nonmetallic element and oxidizing agent that readily forms compounds with most elements. It exists as a $O _2$ molecule in the natural state.
(c) Copper(II) sulfate is a salt and an ionic compound because it is formed from a metal and a non-metal.
(d) Sodium hydroxide is a strong base.
Thus Option D is correct.

Stainless steel is a:

chemistry mix and separate different types of mixtures homogenous and heterogenous mixtures all about mixtures

  1. homogenous mixture

  2. heterogenous mixture

  3. solid solution of two immiscible solids

  4. pure substance

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Correct Option: B
Explanation:

Stainless steel is a metal alloy made up of steel mixed with elements such as chromium, nickel, molybdenum, silicon, aluminium, and carbon. The content of these elements is not uniform throughout the solid solution which is a necessary condition to be a homogenous mixture. Thus stainless steel is a heterogeneous mixture.


Option (B) is correct.

Brass is an example of a:

chemistry mix and separate different types of mixtures homogenous and heterogenous mixtures all about mixtures

  1. homogeneous compound.

  2. homogeneous mixture.

  3. heterogeneous mixture.

  4. heterogeneous compound.

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Correct Option: B
Explanation:

Brass is an alloy made up of uniform composition of copper and zinc. It is a homogeneous mixture in which zinc and copper can be varied to create a range of brasses with varying properties.

Statement: Dissolved particles of a true solution will settle with gravity.


State whether the given statement is true or false.

chemistry mix and separate different types of mixtures homogenous and heterogenous mixtures all about mixtures

  1. True

  2. False

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Correct Option: A
Explanation:

Particles of a true solution will settle with gravity. Take an example when mud is dissolved in water and stirred vigorously, particles of mud are distributed evenly in water. After some time, the particles of this solution settle underwater due to the influence of gravity.


Hence, the given statement is $\text{true}$

Vinegar is a solution of acetic acid in water, it is:

chemistry mix and separate different types of mixtures homogenous and heterogenous mixtures all about mixtures

  1. a homogeneous solid in liquid mixture

  2. a heterogeneous liquid in liquid mixture

  3. a homogeneous liquid in liquid mixture

  4. none of the above

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Correct Option: C
Explanation:

Vinegar is a solution of acetic acid in water.It is a homogenous liquid in  liquid mixture.


The metals present in brass are___and____.

chemistry mix and separate different types of mixtures homogenous and heterogenous mixtures all about mixtures

  1. Iron, Zinc

  2. Copper, Tin

  3. Copper, Zinc

  4. Aluminium, Magnesium

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Correct Option: C
Explanation:

Brass consists of two elements: Copper and Zinc. The ratios of these can vary greatly; however, they are a solid mixture and are homogeneous. 

Which of the following mixtures will be the most difficult to separate?

chemistry mix and separate different types of mixtures homogenous and heterogenous mixtures all about mixtures

  1. Iron filings + sand

  2. Sand + water

  3. Saw dust + stones

  4. Nitrogen + hydrogen

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Correct Option: D
Explanation:

Nitrogen (N2) form ammonia (NH3) by a reaction with hydrogen (H2) using a metal catalyst under high temperatures and pressures. It is a chemical combination reaction. Hence the mixture of nitrogen and hydrogen is difficult to separate because a new product is formed.

Why is sugar a mixture?

chemistry mix and separate different types of mixtures homogenous and heterogenous mixtures all about mixtures

  1. Because the composition is not fixed

  2. Because it's composition is fixed

  3. Because it is crystalline in nature

  4. Because it is soluble in water

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Correct Option: A
Explanation:

When two or more substances are mixed in any ratio, a mixture is formed.

Why alloys are always considered as mixtures?

chemistry mix and separate different types of mixtures homogenous and heterogenous mixtures all about mixtures

  1. They have a fixed composition

  2. They shows the properties of its constituents

  3. They can be seperated into its constituents by physical method

  4. All of the above

Show answer
Correct Option: B
Explanation:

Alloys are homologous mixtures of metals and cannot be separated into its constituents by physical methods. It is still considered a mixture because it shows the property of its constituents and can have variable composition.


Hence, the correct option is $\text{B}$