Tag: nature of matter

Quizzes (5) Questions (61)

Questions Related to nature of matter

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

Which one of the following colloidal solutions is positive sol.?

  1. Blood

  2. Clay soil

  3. Smoke

  4. Gelatin in strong acidic solution
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Blood is a colloidal solution where the dispersed particles (proteins like hemoglobin) carry a positive charge in the physiological pH range, making it a positive sol.

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

In the preparation of AgI sol, the excess of $AgNO _{3}$ is added to potassium iodide solution. The particles of the sol will acquire:

  1. negative charge

  2. positive charge

  3. no charge

  4. unpredictable
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

When AgNO3 is in excess, the AgI particles adsorb Ag+ ions from the solution, forming an AgI/Ag+ layer, which gives the colloidal particles a positive charge.

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

Which statement(s) are correct about colloidal state?

  1. The sol particles acquire charge due to preferential adsorption of ions.

  2. Sol particles do not show cataphoresis at isoelectric point.

  3. The stability of protein sol is minimum at its isoelectric point.

  4. The stability of protein sol is due to the presence of charge as well as their extensive solvation nature.
Reveal answer Fill a bubble to check yourself
A,B,C,D Correct answer
Explanation
When two or more ions are present in the dispersion medium, then the colloidal particles absorb preferentially positive or negative ions present in the dispersion medium.

Isoelectric point (pI or IEP) is the pH of a solution or dispersion at which the net charge on the molecules or colloidal particles is zero.

Most globular proteins have minimum solubility at or near their isoelectric point.

The stability of the protein solution is normally because of the presence of charge as well as their extensive solvation nature.

So all the statements are correct.
Multiple choice chemistry nature of matter heterogenous mixture - colloidal solution and its properties suspensions and colloids mixtures

The colligative properties of a colloidal solution compared to the solution of non-electrolyte of same concentration will be:

  1. same

  2. higher

  3. lower

  4. higher or lower
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The colligative properties of a colloidal solution compared to the solution of non-electrolyte of same concentration will be lower as the colloidal solutions are stable due to the presence of charge particle ans also sometimes coagulation happens which reduces the number of particles in the solution and hencem the colligative property.

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

All colloidal solutions show:

  1. very high osmotic pressure.

  2. high osmotic pressure.

  3. low osmotic pressure.

  4. no osmotic pressure.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

All colloidal solutions behave normally as electrolytes and the movement of solvent from solvent to colloidal solution is very less as the concentration gradient for solvent movement is not significant. hence, colloidal solutions show low osmotic pressure.


Hence,option C is correct.

Multiple choice chemistry nature of matter heterogeneous mixture - suspension and its properties suspension types of mixture

A teacher instructed four students $A, S, C$ and $D$ to prepare a suspension of chalk in water. The students prepared suspension in the following manner:
student $'A'$ places a piece of chalk in water.
student $'S'$ places powdered chalk in water.
student $'C'$ places powdered chalk in water and then shakes the mixture vigorously.
student $'D'$ places powdered chalk in dil. $HCl$.
Which of the following students has correct way of preparation of suspension?

  1. Student A

  2. Student B

  3. Student C

  4. Student D
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The correct option is (c).
On dissolving chalk powder in water,a suspension is obtained.The mixture is stirred for sometime to ensure the uniform dispersion of chalk powder in water.
Suspension is a heterogeneous mixture of particles from which the particles are settled down with time.Chalk powder does not dissolve in water at all.It just forms suspension in water and after some time settles down under the influence of gravity. 

Multiple choice chemistry nature of matter heterogeneous mixture - suspension and its properties suspension types of mixture

Suspension is a non-homogeneous mixture in which very fine particles of .................. are dispersed in .................

  1. solid/liquid, gas/solid

  2. gas, liquid

  3. solid, liquid/gas

  4. solid/liquid/gas, liquid
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

A suspension is a heterogeneous mixture in which very fine particles of a solid dispersed in any medium (liquid/gas). In any suspension, fine particles of the solid remain suspended in the medium.

Multiple choice chemistry nature of matter heterogeneous mixture - suspension and its properties suspension types of mixture

Muddy pond water and smoke is an example of a:

  1. colloid

  2. suspension

  3. true solution

  4. none of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

A suspension is a heterogeneous mixture in which very fine particles (about 10-5m in size) of solid are dispersed in any medium (liquid or gas). In suspension, the solute particles are visible to the naked eye, and remain suspended throughout the bulk of the medium. The Tyndall effect is observed in this mixture.

Muddy pond water, smoke coming out of a chimney, chalk-water mixture, coarse lime particles in water are examples of suspension.