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Surface Chemistry Test - 23

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Surface Chemistry Test - 23
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Weekly Quiz Competition
  • Question 1
    1 / -0
    When $$KClO_3$$ is heated, it decomposes into $$KCl$$ and $$O_2$$. If some $$MnO_2$$ is added, the reaction goes much faster because :
    Solution
    Thermal decomposition of $$KClO_3$$ is found to be accelerated by the presence of $$MnO_2$$. Here, $$MnO_2$$ (foreign substance) act as a catalyst $$2KClO_3+[MnO_2]\longrightarrow 2KCl + 3O_2\uparrow + [MnO_2]$$
    A catalyst is a substance, which increases the rate of reaction without itself being consumed at the end of the reaction, and the phenomenon is called catalysis. There are some catalysts which decrease the rate of reaction and such catalysts are called negative catalyst. Obviously, the catalyst accelerating the rate will be positive catalyst. However, the term positive is seldom used and catalyst itself implies positive catalyst. Catalysts are generally foreign substances but sometimes one of the product formed may act as a catalyst and such a catalyst is called "auto catalyst" and the phenomenon is called auto catalysis.
  • Question 2
    1 / -0
    Activated charcoal is used to remove colouring matter from pure substances. It works by:
    Solution

  • Question 3
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    Rate of physical adsorption increases with:
    Solution

  • Question 4
    1 / -0
    Cow milk, an example of natural emulsion is stabilised by:
  • Question 5
    1 / -0

    The metal used as a catalyst in the hydrogenation of oil is:

    Solution
    It is a well known fact that the metal used as a catalyst in the hydrogenation of oil is nickel.
  • Question 6
    1 / -0

    A substance which alters the rate of reaction:

    Solution

    Catalyst is a substance that changes (usually increases) the rate of a reaction, without being involved in the reaction.A catalyst provides large surface area to one of the reactants, providing it an exposure to be reacted upon by the other reactant.

  • Question 7
    1 / -0
    If the adsorbate is held on the surface of an adsorbent by force of van der Waals type, the adsorption is called:
  • Question 8
    1 / -0

    Which metal is used as a catalyst in the hydrogenation of oils?

    Solution
    Raney Nickel is used as a catalyst in the hydrogenation of oils.Hydrogenation – to treat with hydrogen – is a chemical reaction between molecular hydrogen (H2) and another compound or element, usually in the presence of a catalyst such as nickel, palladium or platinum. The process is commonly employed to reduce or saturate organic compounds.
  • Question 9
    1 / -0
    The catalyst used in preparation of oxygen from hydrogen peroxide is:
    Solution

    Manganese dioxide lowers the activation energy which makes the reaction of decomposition of hydrogen peroxide to oxygen fast. It allows more molecules of $$H_2O_2$$ to undergo decomposition in a shorter period of time.

    Balanced chemical equation of reaction is $$2H_2O_2(aq) \xrightarrow{{MnO_2(s)}} 2H_2O(l)+O_2(g)$$

  • Question 10
    1 / -0
    Cod liver oil is:
    Solution
    $$Explanation:$$

    Cod liver oil is extracted from the liver of the codfish and is enriched with omega-3 fatty acids.

    Cod liver oil is an emulsion i.e. liquid in liquid type solution. In Cod liver oil, water acts as a dispersed phase while oil acts as a dispersion medium. we use acacia gum as an emulsifying agent.

    $$Final\ Answer:$$ Option $$A$$.
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