MCQ Questions for Class 12 Engineering Chemistry Surface Chemistry Quiz 15

Although nitrogen does not adsorb on surface at room temperature, it adsorbs on the same surface at 83K . Which one of the following statements is correct?

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At 83 K, there is formation of monolayer
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At 83 K, nitrogen is adsorbed as atoms
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At 83 K, nitrogen molecules are held by chemical bonds
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At 83 K, there is formation of multimolecular layers

Read two statements:
(1) Milk is an example of oil in water (O/W) type emulsion
(2) Cold cream is an example of water in oil (W/O) type emulsion

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Only statement 1 is correct
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Only statement 2 is correct
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Both are correct
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None of these

Select correct statement:

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Water in oil emulsions are more viscous than the aqueous emulsions
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Electrical conductance of aqueous emulsions is less than that of oil emulsions
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De-emulsification can be done by soap or detergent
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An emulsion can be diluted with $H_2O$ then it is oil in water (O/W) type

$10\%$ sites of catalyst bed have adsorbed by

$H_{2}$ on Heating

$H_{2}$ gas is evolved from sites and collected at

$0.03$ atm and

$300\,K$ in a small vessel of

$2.46\,cm^{3}$ :
No. of sites available is

$5.4 \times 10^{16}\, per\,cm^{2}$ and surface area is

$1000\,cm^{2}$ . Find out the no. of surfaces sites occupied per molecule of

$H_{2}$ . (Given

$N_{A} = 6 \times 10^{23})$

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$1$
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$2$
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$3$
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None of these

Explanation

Adsorbed moles of

$H_{2} = \dfrac{0.03 \times 2.46 \times 10^{-3}}{0.0821 \times 300}$

$= 3 \times 10^{-6}$

$\therefore$ No. of absorbed molecules of

$H_{2}$

$= 3 \times 10^{-6} \times 6 \times 10^{23}$

$\Rightarrow 18 \times10^{17}$

Total no. of surface sites available

$= 5.4 \times 10^{16} \times 1000$

$\Rightarrow \, 5.4 \times 10^{19} \, cm^{2}$

No. of surface sites that is occupied by adsorption of

$H_{2}$

$= \dfrac{10}{100} \times 5.4 \times 10^{19}$

$\Rightarrow$

$5.4 \times 10^{18}$

No. of surface sites occupied by one molecule

$H_{2}$

$= \dfrac{5.4 \times 10^{18}}{18 \times 10^{17}} = 3$

CBSE Questions for Class 12 Engineering Chemistry Surface Chemistry Quiz 15 - MCQExams.com

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Practice Class 12 Engineering Chemistry Quiz Questions and Answers

CBSE Questions for Class 12 Engineering Chemistry Surface Chemistry Quiz 15 - MCQExams.com

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Practice Class 12 Engineering Chemistry Quiz Questions and Answers

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