Types of Catalysis

Q.

Which of the following compounds is used as an antifreeze in automobile radiators?

1. Methyl alcohol

2. Glycol

3. Nitrophenol

4. Ethyl alcohol

Q. 10g of MnO2 on reaction with HCl forms 2.24L of Cl2(g) at NTP, the percentage impurity of MnO2 is MnO2 + 4HCl MnCl2 + Cl2 + 2H2O (1) 87% (2) 25% (3) 33.3% (4) 13%

Q.

What conditions must be present for a chemical reaction?

Q.

What is the coordination entity formed when excess of aqueous KCN is added to an aqueous solution of copper sulphate? Why is it that no precipitate of copper sulphide is obtained when H₂S(g) is passed through this solution?

Q.

Will CCl₄ give white precipitate of AgCl on heating it with silver nitrate? Give reason for your answer.

Q.

Explain the functioning of Inhibitor.

Q.

The catalyst used in the hydrogenation of oils is _____________(iron/nickel).

Q.

Why zeolites are called good shape selective catalyst

Q. In an enzyme solution, sucrose undergoes fermentation. If $0.10M$ solution of sucrose is reduced to $0.05M$ in $10$ hours and to $0.025M$ in $20$ hours, what is the rate constant ?

1. 
   $1.1\times {10}^{-5}{s}^{-1}$
2. 
   $1.4\times {10}^{-5}{s}^{-1}$
3. 
   $1.9\times {10}^{-5}{s}^{-1}$
4. 
   $0.5\times {10}^{-5}{s}^{-1}$

Q. In Ostwald’s process, oxidation of gaseous ammonia into nitric acid takes place in the presence of solid platinum gauze, which acts as the catalyst for this reaction. This is an example of:

1. Homogeneous catalysis
2. Heterogeneous catalysis
3. Both a and b
4. Cannot be determined

Q.

Assertion: Enzymes lower the activation energy.
Reason: A substrate molecule can be acted upon by a particular enzyme.

1. Both A and R are true and R is the correct Explanation for A.

2. Both A and R are true, but R is not the correct explanation for A.

3. A is true and R is false.

4. A is false and R is true.

Q.

A following mechanism has been proposed for a reaction

The rate law expression for the reaction is:

1. r = k[A]²[C]

2. r = k[A]²

3. r = k[A][B]

4. r = k[A]²[B]

Q.

The addition of MnO₂ to KClO₃ decreases the temperature at which KClO₃ decomposes because MnO₂ added acts as ______ catalyst.

Q. Which of the following is not an example of heterogeneous catalysis?

1. Combination of dinitrogen and dihydrogen to form ammonia in the presence of finely divided iron in Haber’s process
2. Hydrogenation of vegetable oils in the presence of finely divided nickel as catalyst
3. Oxidation of sulphur dioxide to sulphur trioxide in the presence of Pt
4. Oxidation of sulphur dioxide to sulphur trioxide with dioxygen in the presence of oxides of nitrogen as catalysts in the lead chamber process

Q.

An example of auto-catalytic reaction

1. Oxidation of oxalic acid by acidified $KMn{O}_4$

2. Thermal decomposition of $KCl{O}_3$ in presence of $Mn{O}_2$

3. Hydrogenatin of oils in presence of nickle

4. Decomposition of Hydrogen Peroxide in presence of Ferric chloride

Q.

Why does Activation Energy need to be reduced?

Q. A plot of log (x/m) and log ‘p’ is a straight line at an angle of 45° and the intercept on the y-axis is equal to 0.3010. Calculate the amount of gas adsorbed in gram per gram of adsorbent when pressure is 0.2 atm.

Q. Which of the following reaction involves homogeneous reduction?

1. 
2. 
3. 
4. 

Q. Which equation is true to calculate the energy of activation, if the rate of reaction is doubled by increasing temperature from $T_{1}Kto{T}_{2}K?$

1. $lo{g}_{10}\left(\frac{k_1}{k_2}\right)=\frac{E_a}{2.303R}[\frac{1}{T_1}-\frac{1}{2T_2}]$
2. $lo{g}_{10}2=\frac{2E_a}{2.303R}[\frac{1}{T_1}-\frac{1}{T_2}]$
3. $lo{g}_{10}\frac{1}{2}=\frac{E_a}{2.303R}[\frac{1}{T_1}-\frac{1}{T_2}]$
4. $lo{g}_{10}2=\frac{E_a}{2.303R}[\frac{1}{T_1}-\frac{1}{T_2}]$

Q.

Describe the preparation of potassium permanganate. How does the acidified permanganate solution react with (i) iron(II) ions (ii) SO₂ and (iii) oxalic acid?

Write the ionic equations for the reactions.

Q.

Give reasons:

${\mathrm{MnO}}_2$ is used for decomposition of potassium chlorate

Q. 48.Which of the following is adsorbed maximum by activated charcoal? 1)CH4 2)N2 3)CO2 4)H2

Q.

Energy is_____ when Nitrogen combines with Oxygen to form NO.

Q.

A substance which increases the efficiency of a catalyst is known as ___________________.

Q. Which one of the following is an example of negative catalysis?

1. Oxidation of SO₂ to SO₃ in presence of V₂O₅
2. Decomposition of H₂O₂ in presence of phosphoric acid
3. Oxidation of NH₃ in presence of platinum.
4. Combination of N₂ and H₂ to form NH₃ in presence of iron

Q. Burning of coal is represented as $C\left(s\right)+O_2\left(g\right)\to C{O}_2\left(g\right).$ The rate of this reaction is increased by:

1. Decreasing in the concentration of oxygen
2. Powdering the lumps of coal
3. Decreasing the temperature of coal
4. Providing inert atmosphere

Q. If 0.228g of silver salt of dibasic acid gave a residue of 0.162g of silver on ignition, then molecular weight of the acid is

Q. Air can oxidize sodium sulphite in aqueous solution but not sodium arsenite. However, if air is passed through a solution containing both, then both are oxidized. This is an example of

1. auto-catalysis
2. positive catalysis
3. negative catalysis
4. induced catalysis

Q. Which is a stronger reducing agent Cr2+ or Fe2+ aned why!

Q. The oxidation of oxalic acid by acidified $KMn{O}_4$ is an example of autocatalysis. It is due to which of the following?

1. $S{O}_4^{2-}$
2. $M{n}^{2+}$
3. $K^{\oplus }$
4. $Mn{O}_4^{2-}$