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Surface Chemistry Test - 22

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Surface Chemistry Test - 22
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Weekly Quiz Competition
  • Question 1
    1 / -0
    A catalyst is a substance which:
    Solution
    The two main ways catalysts affect chemical reactions are by creating a way to lower activation energy or by changing how the reaction happens. 

    Therefore, they can lower the energy of the transition state, so the overall activation energy needed for the reaction decreases.

    They can alter the mechanism of a reaction and thus change the transition state.

    Hence, option $$B$$ is correct.
  • Question 2
    1 / -0
    Pesticides & insecticides are available in the form of :
    Solution
    Pesticides & insecticides are available in the form of powder, sprays and emulsions.
  • Question 3
    1 / -0
    The catalyst in photosynthesis is:
    Solution

    The work of chlorophyll is to absorb light energy from sunlight and transfer it to other molecules used for a process of photosynthesis. This energy is utilized in synthesize carbohydrates using $$CO_2$$.

    Further, it also doesn't use in a reaction of photosynthesis hence it acts as the catalyst in this reaction.
    Complete balanced chemical equation is $$6H_2O + 6CO_2 \rightarrow C_6H_{12}O_6 + 6O_2$$

  • Question 4
    1 / -0
    Cleansing action of soaps includes:
  • Question 5
    1 / -0
    Which metal is used as a catalyst in the hydrogenation of oils?
    Solution

    Hydrogenation is a chemical reaction between molecular hydrogen $$(H_2)$$ 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 6
    1 / -0
    In physical adsorption, the adsorbent and adsorbate are held together by the:
    Solution
    In physical adsorption, the force of attraction between the molecules of the adsorbate and adsorbent is of weak Van der Waal's force. This is a weak force of attraction.

    So, the correct option is $$C$$
  • Question 7
    1 / -0
    The action of cleaning of oily dirt by soap is based on
    Solution
    The action of cleaning of oily dirt by soap is based on presence of hydrophilic and (i.e., ionic part) and hydrophobic end (i.e., hydrocarbon past).
  • Question 8
    1 / -0
    Whenever a mixture of gases is allowed to come in contact with a particular adsorbent under the same conditions, the more strong adsorbate is adsorbed to greater extent irrespective of its amount present. For example, $$H_2O$$ is adsorbed to more extent on silica gel than $$N_2$$ and $$O_2$$. This shows that some adsorbates are preferentially adsorbed. It is also observed that preferentially adsorbable adsorbents can displace a weakly adsorbed substance from the surface of an adsorbent.

    Which of the gas can displace remaining all the gases?
    Solution
    Whenever a mixture of gases is allowed to come in contact with a particular adsorbent under the same conditions, the more strong adsorbate(Depends on factors like polarity and chemical reactivity) is adsorbed to greater extent irrespective of its amount present, e.g.$$H_2O$$ is adsorbed to more extent on silica gel than $$N_2$$ and $$O_2$$
    Here, among given gases, CO is most reactive and most polar so it will replace all other gases.
  • Question 9
    1 / -0
    The metal used as a catalyst in the hydrogenation of oils is:
    Solution

    $$Ni$$ as catalyst binds both the $$H_2$$ and the unsaturated substrate and facilitates their union which is the mechanism of hydrogenation of oil while other given element can't able to do so.

    $$Ni$$ is used for most reaction as the catalyst because of it is cheaper to run the reaction with it, in commercial world cost-effectiveness is best and desired pathway.

  • Question 10
    1 / -0
    On adding dilute $$HCl$$ to chalk piece, $${CO}_{2}$$ is evolved. This is an example of:
    Solution
    Heterogeneous reactions are chemical reactions in which the reactants and products are in a different phase.
    Dilute $$HCl$$ is a liquid, chalk piece is solid. Both react with each other to form $$CO_2$$ gas. So this reaction is a heterogeneous reaction.

    $$2HCl(l) + CaCO_3(s)\rightarrow CaOCl_2(s) + CO_2(g)$$

    Hence, option $$A$$ is correct.
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