Tag: suspensions and colloids

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Questions Related to suspensions and colloids

Multiple choice chemistry nature of matter heterogenous mixture - colloidal solution and its properties suspensions and colloids mixtures

The colour of colloidal solution depends upon size and shape of sol particles.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The colour of a colloidal solution depends upon the size of colloidal particles present in it. Larger particles absorb the light of longer wavelength and therefore, transmit light of shorter wavelength. For example, a silver having particles of size $150$ nm appears violet whereas, that having particles of size $60$ nm appears orange yellow.

Multiple choice chemistry nature of matter heterogenous mixture - colloidal solution and its properties suspensions and colloids mixtures

Which of the following is/are true?

  1. Colloidal solution does not show tyndall effect

  2. Colloidal solution show brownian movement

  3. Colloidal solution are heterogeneous

  4. Size of the colloidal particle is less than 1 nm
Reveal answer Fill a bubble to check yourself
B,C Correct answer
Explanation

The options (B) and (C) represent true properties of colloidal solutions.
(A) Colloidal solution show Tyndall effect. They scatter light and make path of light visible through dispersion.
(B) Colloidal solution show Brownian movement which is ceaseless, random motion (of disperse phase particles) in all directions over a large area.
(C) Colloidal solution are heterogeneous. They are two phase system, dispersed phase and dispersion medium. There  is a definite surface of separation between each particle of dispersed phase and the dispersion medium
(D) Size of the colloidal particle is between 1 nm and 1000 nm.

Multiple choice chemistry nature of matter heterogenous mixture - colloidal solution and its properties suspensions and colloids mixtures

Finely powered or colloidal catalyst particles having small surface area are rich in free valencies.
State whether the statement is True or False

  1. The statement is True

  2. The statement is False

  3. Neither

  4. Finely powered or colloidal catalyst particles having large surface area are rich in free valencies.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Finely powered or colloidal catalyst particles having small surface area cannot be rich in free valencies. When the catalyst is finely powdered the surface area of the particle is small but total surface area is very large.

Multiple choice chemistry nature of matter heterogenous mixture - colloidal solution and its properties suspensions and colloids mixtures

Which of the following is true for colloidal solution?

  1. Heterogeneous

  2. Settles by just gravity

  3. Diffuses slowly through animal membrane

  4. Does not show Tyndall effect
Reveal answer Fill a bubble to check yourself
A,C Correct answer
Explanation

The statements $(A)$ and $(C)$ are true for colloidal solution.
These are heterogenous (two phase) systems that diffuses slowly through animal membrane (parchment).
These solutions do not settles by just gravity.
Colloidal solutions show Tyndall effect (the particles scatter the light).

Multiple choice chemistry nature of matter heterogenous mixture - colloidal solution and its properties suspensions and colloids mixtures

A liquid is found to scatter a beam of light but leaves no residue when passed through the filter paper. The liquid can be described as :

  1. a suspension

  2. oil

  3. a colloidal sol

  4. a true solution
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

A liquid is found to scatter a beam of light (due to Tyndall effect) but leaves no residue when passed through the filter paper (as the size of the particles is smaller than the pores of the filter paper).
The liquid can be described as a colloidal sol.

Multiple choice chemistry nature of matter heterogenous mixture - colloidal solution and its properties suspensions and colloids mixtures

When negatively charged colloid-like $As _2S _3$ sol is added to +vely charged $Fe(-OH) _3$ sol in suitable amounts:

  1. both the sols are precipitated simultaneously

  2. this process is called mutual coagulation

  3. they become positively charged colloid

  4. they become negatively charged colloid
Reveal answer Fill a bubble to check yourself
A,B Correct answer
Explanation

When -vely charged colloid-like $As _2S _3$ sol is added to +vely charged $Fe(OH) _3$ sol in suitable amounts both the sols are precipitated simultaneously it is due to the fact that negatively charged particles of the arsenious sulphide sol take up positive ions, resulting neutralisation of the charge on the colloidal particles and hence lowering the stability of the sol and both precipitate simultaneously.

Multiple choice chemistry nature of matter heterogenous mixture - colloidal solution and its properties suspensions and colloids mixtures

The size of colloidal particle is:

  1. ${10}^{-3}$ to ${10}^{-9}m$
  2. ${10}^{-3}$ to ${10}^{-12}m$
  3. ${10}^{-6}$ to ${10}^{-9}m$
  4. ${10}^{-12}$ to ${10}^{-19}m$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The particle size of the colloidal particle in dispersed phase typically ranges from $1 \ nanometer$ to $ 1 \ micrometer$ or. ${10}^{-6}$ to ${10}^{-9}m$