Tag: chemistry

Questions Related to chemistry

Which of the following is true about solution containing micelle?

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

  1. It is a true solution.

  2. It is a colloidal solution

  3. It is a suspension.

  4. Any of the above.

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Correct Option: B
Explanation:

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

Which one of the following colloidal solutions is positive sol?

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

  1. Blood

  2. Clay soil

  3. Smoke

  4. Gelatin

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Correct Option: D
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.

The colloidal solution of gelatin is known as:

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

  1. solvent loving.

  2. reversible.

  3. hydrophilic.

  4. all of these.

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Correct Option: D
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.

Which is not lyophilic colloid?

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

  1. Milk

  2. Gum

  3. Fog

  4. Blood

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Correct Option: C
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.

Which of the following shows the maximum hydrophobic behaviour?

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

  1. Adenine

  2. Glucose

  3. Stearic acid

  4. Glycine

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Correct Option: A
Explanation:

$\text{Adenine has the least tendency to attract with water molecules.}$

$\text{Hence it has the maximum hydrophobic behavior.}$

Crystalloid and colloid differ with respect to:

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

  1. Tyndall effect

  2. particle size

  3. diffusion through animal or vegetable membrane

  4. number of particles per unit volume of solution

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Correct Option: A,B,C
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.

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

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

  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. $Cu + CuCl _{2}\xrightarrow {\text {in presence of excess of HCl}} Cu _{2}Cl _{2}$

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Correct Option: B

Clouds, mist, fog, and aerosols (such as perfumes and sprays) are colloidal solutions of a:

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

  1. liquid in a gas

  2. gas in a solid

  3. solid in a gas

  4. gas in a liquid

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Correct Option: A
Explanation:
Clouds, mist, fog all these are liquid aerosols systems, i.e., liquid dispersed in a gas.

Colloidal particle can be seen by?

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

  1. Naked eye

  2. Ultramicroscope

  3. Microscope

  4. Telescope

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Correct Option: B
Explanation:
Colloidal particles are not seen to the naked eye but can be studied by ultramicroscop.
Lower limit $\longrightarrow$ $1nm$ and $5nm$
Upper limit $\longrightarrow$ $100nm$ and $500nm$

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

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

  1. Blood

  2. Clay soil

  3. Smoke

  4. Gelatin in strong acidic solution

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Correct Option: A