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Read the following and answer the questions from 18(i) to 18(v) Q18. A homogeneous mixture of two or more substances is called a true solution. It consists of solute and solvent. The particle size of the true solution is less than 1 nm. A suspension a heterogeneous mixture in which the solute particles do not dissolve but remain suspended throughout the bulk of the medium. A colloid a mixture that is actually heterogeneous but appears to be homogeneous. As the particles .
18 (i). which one the following is the most stable.
(a) True solution
(b) suspension
(c) colloid
(d) Both A and B
18 (ii). which type of mixture can be separated by the filtration .
(a) Colloid
(b) True Solution
(c) Suspension
(d) All of these
18 (iii). Which statement is incorrect about Tyndall effect:
(a) size of the particles causes Tyndall effect
(b) if particles are very tiny, there is no Tyndall effect
(c) True solution show Tyndall effect
(d) All of the above
18 (iv) . Which is the correct order of stability of solution
(a) True <Colloid<Suspension
(c) True < Suspension < Colloid
(b) Suspension < True < Colloid
(d) Suspension < Colloid < True
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A Mixture is a substance made up of two or more different chemical substances that are not chemically combined.
Explanation:
- A true solution is a homogeneous mixture with uniform properties throughout which makes is the most stable solution.
Hence. The solution which is the most stable is (a) True Solution.
- The mixture which can be easily separated by filter paper where the suspended particles can be seen by the naked eye is Suspension, as the particles do not mix together and can be separated physically.
Hence, the type of mixture which can be separated by filtration is (c) Suspension.
- The Tyndall effect, also known as the Tyndall phenomenon, is the scattering of a light beam by a medium containing small sized suspended particles not visible to the naked eye.
- True Solution do not show tyndall effect as the mixture is uniform throughout and the size of the particles is very tiny which again does not enable Tyndall phenomenon.
Hence, The statement which is incorrect about Tyndall effect is (c)True solution show Tyndall effect.
- As We know, True solution is the most stable solution as the stability is determined by the size of particles. The colloid has small sized particles larger than true solution but smaller than suspension. A suspension has the most large sized particles which makes it unstable.
Hence, The correct order of stability of solution is (d) Suspension < Colloid < True Solution.
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