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Surface Chemistry Test - 55

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Surface Chemistry Test - 55
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Weekly Quiz Competition
  • Question 1
    1 / -0
    Which of the following option is correct for colloids?
    Solution
    Sky is blue in color due to the scattering of light by the colloidal dust particles in the air. Sea water looks blue due to the scattering of light by the colloidal impurities. Blood is a colloid of plasma proteins. It is a solution of salts, glucose, urea and a few other small compounds.
  • Question 2
    1 / -0
    Smoke particles are actually electrically charged colloidal particles of :
    Solution
    Smoke particles are electrically charged colloidal particles of carbon in the air.
  • Question 3
    1 / -0
    The colloidal solution of $$X$$ in gelatin is applied in glass plates to form sensitive plates in photography. Identify $$X$$:
    Solution
    $$AgBr$$ (Silver bromide) is used in photography. The colloidal solution of it in gelatin is applied in glass plates to form sensitive plates.
  • Question 4
    1 / -0
    Which of the following is absorbed efficiently in colloidal forms?
    Solution

    Colloidal sulfur is a suspension of fine sulfur particles, usually in a gum base. A good way to think about this is if one were to grind up pure sulfur and dust it into a gelatin mix before it firmed up. Colloidal sulfur is a homoeopathic 'natural' remedy used to treat skin conditions such as acne, psoriasis, eczema, and dermatitis. Colloidal sulfur can be taken orally or mixed with other ingredients and used as soap or shampoo.

    Sulfur is lighter weight element and can serve as a powerful antioxidant, removing free radicals of oxygen and fluorine. Overall, colloidal sulfur is a safe substance that has been used throughout human history as a treatment for skin conditions and can be used today as an effective diet supplement.

  • Question 5
    1 / -0
    Which of the following process is responsible for formation of delta at a place where river meets the sea?
    Solution
    River water is a colloidal solution of clay and sea. Water contains various electrolytes. When river water comes in contact with sea water, then the electrolytes present in sea water coagulate the suspended colloidal particles which ultimately settle down at the point of contact.
  • Question 6
    1 / -0
    In an adsorption experiment, a graph between log$$\left(\displaystyle\frac{x}{m}\right)$$ versus log $$p$$ is found to be linear with slope of $$45^o$$. The intercept on log$$\left(\displaystyle\frac{x}{m}\right)$$ axis was found to $$0.3010$$. The amount of the gas adsorbed per gram of charcoal under the pressure of $$0.5$$ atm will be:
    Solution
    We know
    $$\displaystyle\frac{x}{m}=kp^{1/n}$$

    or, $$log\displaystyle\frac{x}{m}log k+\frac{1}{n}log p$$

    $$\therefore$$ Plot of $$log\displaystyle\frac{x}{m}vs\cdot log p$$ is linear

    with slope $$=\displaystyle\frac{1}{n}$$ and intercept $$=log k$$

    Hence, $$\displaystyle\frac{1}{n}=\tan\theta =\tan 45^o=1$$ i.e., $$n=1$$

    and $$log k=0.3010$$ or $$k=$$ antilog $$(0.3010)=2$$

    At $$p=0.5$$ atm, $$\displaystyle\frac{x}{m}=kp^{1/n}=2\times (0.5)^1=1.0$$.
  • Question 7
    1 / -0
    Activated charcoal is used to remove coloring matter from pure substances. It works by:
    Solution
    Activated charcoal is used to remove colouring matter from pure substances. It works by adsorption. Colour impurities are adsorbed on the surface of activated  charcoal.
  • Question 8
    1 / -0
    Cow milk, an example of neutral emulsion is stabilized by:
    Solution
    Cow milk an example of a neutral emulsion is stabilized by casein.

    Cow milk is liquid fat particles dispersed in water. It is oil in water type emulsion. Casein is protective colloid with gold number $$0.01-0.02$$. 

    Casein is a phosphoprotein which occurs in the milk of mammals as a suspension of calcium caseinate. It is the main protein of milk.

    Hence, option C is correct.
  • Question 9
    1 / -0
    Which is used for ending charge on colloidal solutions?
    Solution
    Electrolysis is used to end charge on colloidal particles. When an electric current is passed through a colloidal solution, the charged particles move towards the oppositely charged electrode and coagulate due to loss of charge.
  • Question 10
    1 / -0
    Bredig's arc method is used for the preparation of colloidal solution of:
    Solution
    Bredig's arc method is suitable for the preparation of colloidal solutions of metals like gold, silver, platinum, etc.
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