Heterogeneous Catalysis

Q.

What is the chemical formula of zeolite?

Q.

How do Zeolites function in removing the hardness of water?

Q.

What is shape selective catalysis?

Q. Which of the following is always less than zero during adsorption?

1. $\Delta G$
2. $\Delta S$
3. $\Delta H$
4. All of the above

Q. what is catalist?

Q.

Describe some features of catalysis by zeolites. ?

Q.

Give four examples of heterogeneous catalysis ?

Q.

The free energy change of a reversible reaction at equilibrium is

1. +ve

2. Zero

3. Negative

4. Infinite

Q. which of the following statement is incorrect? (A) All elements are homogenous. (B) Compounds always contain two or more different elements (C) A mixture is not always heterogeneous. (D) Air is a heterogeneous mixtur

Q. A catalyst adsorbs $100$ mL of nitrogen gas at S.T.P. per gram of catalyst surface and forms as a mono-molecular layer. The effective surface area occupied by one nitrogen molecule on the surface of catalyst is $0.16\times {10}^{–14}{\text{cm}}^2$ . What is the total surface area occupied by nitrogen molecules per gram of catalyst?
(Given: Volume of gas at STP = 22.4 L)

1. $43.04\times {10}^5{\text{cm}}^2$
2. $0.18\times {10}^{–15}{\text{cm}}^2$
3. $42\times {10}^5{\text{cm}}^2$
4. $0.19\times 9^{–15}{\text{cm}}^2$

Q.

Which one is not true about catalyst ?

1. The catalyst accelerates the reaction

2. In a reversible recation the catalyst alters the equilibrium position

3. A small quantity of catalyst is often sufficient to bring about considerable amount of reaction

4. The catalyst is unchanged at the end of the reaction

Q.

What do you understand by activity and selectivity of catalysts ?

Q. Which of the following statement is incorrect about positive and negative catalysts?

1. Positive catalyst lowers the energy of activation.
2. Negative catalyst lowers the energy of activation.
3. Positive catalyst increases the rate of reaction.
4. Negative catalyst removes active intermediates.

Q. At the equilibrium condition in the process of adsorption ________

1. $\Delta H>0$
2. $\Delta H=T\Delta S$
3. $\Delta H>T\Delta S$
4. $AH<T\Delta S$

Q. In Deacon's process, chlorine is prepared by:

1. Heating $NaCl$ with concentrated $H_{2}S{O}_4$
2. Heating $NaCl,Mn{O}_2$ with concentrated $H_{2}S{O}_4$
3. Oxidation of $HCl$ with $O_2$ in presence $CuC{l}_2$ catalyst at $723\text{K}$
4. Passing $I_2$ vapors through $NaCl$ solution

Q. Deacons process is used for the preparation of:
[0.77 Mark]

1. $C{l}_2$
2. $H_{2}S{O}_4$
3. $N{H}_3$
4. $HN{O}_3$

Q.

What are the properties of zeolite?

Q. $CO\left(g\right)$ and $H_2\left(g\right)$ react to give different products in the presence of different catalysts. Which ability of the catalyst is shown by these reactions?

Q.

Example of the heterogeneous catalytic reaction

Q. Write short notes on the following:
(i) Tyndall effect
(ii) Activity and selectivity of catalysts.

Q. Heterogeneous catalysis is also called___catalysis.

Q. Adsorption theory of heterogenous catalyst fails to explain the action of catalytic poisons and catalytic promoters

1. True
2. False

Q. Platinised asbestos is used as a catalyst in, the manufacture of $H_{2}S{O}_4$. It is an example of:

1. induced catalyst
2. homogeneous catalyst
3. heterogeneous catalyst
4. autocatalyst

Q. Write one difference in each of the following:
(a) Multimolecular colloid and Associated colloid
(b) Coagulation and Peptization
(c) Homogeneous catalysis and Heterogeneous catalysis

Q. Which kind of catalysis can be explained on the basis of adsorption theory?

1. Homogeneous catalysis
2. Heterogeneous catalysis
3. Negative catalysis
4. Auto catalysis

Q. Explain Adsorption theory of Heterogeneous Catalysis.

Q. In which of the following reactions heterogeneous catalysis is involved?
(I) $2S{O}_2$ + $O_2$ $\stackrel{V_2{O}_5}{⟶}$ $2S{O}_3$
(II) $2S{O}_2$ + $O_2$ $\stackrel{N{O}_{\left(g\right)}}{⟶}$ $2S{O}_3$
(III) $2N_2+3H_2$ $\stackrel{Fe}{⟶}$ $2N{H}_3$
(IV) $C{H}_{3}COOC{H}_3$ + $H_{2}O$ $\stackrel{HC{l}_{\left(aq\right)}}{⟶}$ $C{H}_{3}COOH$ + $C{H}_{3}OH$

1. (I), (III)
2. (II), (III), (IV)
3. (I), (II), (III)
4. (IV)

Q. (a) What is selectivity of catalyst? Write example.
(b) What happens when hydrated ferric oxide sol is mixed with arsenius sulphide sol?
(c) Explain Tyndall effect with labelled diagram.

Q.

What is shape selective catalysis?

Q.

What is shape selective catalysis ?