Tag: all about mixtures

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Questions Related to all about mixtures

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

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 :

  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)
Reveal answer Fill a bubble to check yourself
D Correct answer
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.

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

Stainless steel is a:

  1. homogenous mixture

  2. heterogenous mixture

  3. solid solution of two immiscible solids

  4. pure substance
Reveal answer Fill a bubble to check yourself
B Correct answer
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.

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

Brass is an example of a:

  1. homogeneous compound.

  2. homogeneous mixture.

  3. heterogeneous mixture.

  4. heterogeneous compound.
Reveal answer Fill a bubble to check yourself
B Correct answer
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.

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

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


State whether the given statement is true or false.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
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 $\text{true}$

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

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

  1. Iron filings + sand

  2. Sand + water

  3. Saw dust + stones

  4. Nitrogen + hydrogen
Reveal answer Fill a bubble to check yourself
D Correct answer
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.