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Surface Chemist...

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  • Question 1
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    Consider the following reactions at 300 K: X $$\rightarrow$$ Y (uncatalysed reaction) & X $$\rightarrow$$ Y (catalysed reaction). The energy of activation is lowered by 83.14 kJmol$$^{-1}$$ for the catalysed reaction. 

    The rate of catalysed reaction is:

  • Question 2
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    A reaction is catalysed by $$H^{+}$$ ion in the presence of $$HA$$, rate constant is $$2\times 10^{-3}min^{-1}$$ and in presence of $$HB$$, rate constant is $$1\times 10^{-3}min^{-1}$$ . $$HA$$ and $$HB$$ (both strong acids) have relative strength as:

  • Question 3
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    Gelatin protects

  • Question 4
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    Assertion: A negative catalyst retards the rate of chemical reaction.
    Reason: Presence of negative catalyst boosted up the energy of activation.

  • Question 5
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    Consider the following statements and arrange in the order of true/false as given in the codes.
    $$S_1: $$ The rate of the reaction A $$\rightarrow$$ B having the rate law $$- \displaystyle \frac{d[A]}{dt} = k [A] [B]$$ when plotted against time will exhibit a maximum at some time.
    $$S_2: $$ A catalyst in a chemical reaction increases the forward E$$_a$$ and decreases the backward $$E_a$$
    $$S_3: $$ A catalyst in a chemical reaction decreases both forward and backward $$E_a$$
    $$S_4: $$ For a first-order reaction, the time required to reduce successively the concentration of reactant by a constant fraction is always same.

  • Question 6
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    Select the incorrect statement regarding the given reaction.


    $$RCOCl+H_2\xrightarrow{Pd-BaSO_4} RCHO+HCl$$

  • Question 7
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    Which of the following cannot be used to prepare an emulsion of benzene in water?

  • Question 8
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    Smoke screens consist of:

  • Question 9
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    Directions For Questions

    The catalytic activity and collodial nature of a substance are surface phenomenon. Both these properties depend upon the property of adsorption. Adsorption may be physisorption or chemisorption. Adsorption is spontaneous and always leads to decrease in entropy and evolution of heat. Chemisorption is irreversible with temperature, unilayer, specific and directional. Adsorbate molecules adsorbs on cataylst surface and thus, lower energy of activation of reaction to provide a new path way for reaction. In colloidal state, dispersed phase particles possess the adsorption characteristics at the interface.

    ...view full instructions

    Which statement is incorrect?

  • Question 10
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    Directions For Questions

    $$1$$ g of activated charcoal has a surface area $${10}^{3}\ {m}^{2}$$. One molecule of $$N{H}_{3}$$ having diameter $$0.3$$ nm is supposed to be adsorbed on complete surface of charcoal forming unilayer adsorption. The activated charcoal is brought in contact with $$100$$ mL of $$2\ M$$ $$N{H}_{3}$$ solution.

    ...view full instructions

    How many $$N{H}_{3}$$ molecules are adsorbed on charcoal surface?

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