Tag: chemistry

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Questions Related to chemistry

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

Which of the following is true about solution containing micelle?

  1. It is a true solution.

  2. It is a colloidal solution

  3. It is a suspension.

  4. Any of the above.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The solution containing micelle is a colloidal solution.  A micelle is an aggregate of soap ( or detergent)  molecules dispersed in a liquid colloid.

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
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Colloidal particles always carry an electric charge. It is of two types: Positive and Negative.


Positively charged sols are mostly metal hydroxides whereas negatively charged sols are metal sols or metal sulphide sols. 


Among all the given options, gelatin is the correct answer.

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

The colloidal solution of gelatin is known as:

  1. solvent loving.

  2. reversible.

  3. hydrophilic.

  4. all of these.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
Gelatin, can behave both as a sol and a gel. At high temperature and low concentration of gelatin, the colloid is a hydrosol, but at low temperature and high gelatin concentration, the hydrosol can change into a gel which is solvent loving and hydrophilic.
Multiple choice chemistry nature of matter heterogenous mixture - colloidal solution and its properties suspensions and colloids mixtures

Which is not lyophilic colloid?

  1. Milk

  2. Gum

  3. Fog

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

Fog is not a lyophilic colloid. Fog is a colloidal solution of liquid in a gas in which liquid is the dispersed phase whereas gas is the dispersion medium. Fog is a colloidal solution of liquid in a gas in which liquid is the dispersed phase whereas gas is the dispersion medium.

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

Crystalloid and colloid differ with respect to:

  1. Tyndall effect

  2. particle size

  3. diffusion through animal or vegetable membrane

  4. number of particles per unit volume of solution
Reveal answer Fill a bubble to check yourself
A,B,C Correct answer
Explanation

Crystalloids are aqueous sollutions of salts and minerals that can be crystallized where as colloids can't be crystallized .

Tyndall effect is shown by colloids but not by crystalloids.
Colloids are bigger in size compared to crystalloids
Colloids are larger and diffuse slower than crystalloids and rate of diffusion is different for both.
Number of particles per unit volume is independent of the nature of particle and could be same.

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

Out of the following, which reaction gives a colloidal solution?

  1. $Cu + HgCl _{2}\rightarrow CuCl _{2} + Hg$
  2. $2HNO _{3} + 3H _{2}S\rightarrow 3S + 4H _{2}O + 2NO$
  3. $2Mg + CO _{2} \rightarrow 2MgO + C$
  4. $Cu + CuCl _{2}\xrightarrow {\text {in presence of excess of HCl}} Cu _{2}Cl _{2}$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Similar to the previous question, the reaction of hydrogen sulfide with nitric acid produces sulfur, which forms a colloidal sol.

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.