- 1(current)
Q. No.Enzymes are:
1. Biochemical catalysts.
2. Protein molecules of high molecular masses.
3. Both (1) and (2)
4. None of the above.
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Shape selective catalysis is:
| 1. | Catalytic reaction depends upon the pore structure of the catalyst. |
| 2. | Catalytic reactions depend on the size of the reactant and the product molecules. |
| 3. | Both '1' and '2' |
| 4. | None of the above. |
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Which one of the following statements about enzyme catalysis is incorrect?
| 1. | Enzymes are mostly proteinous in nature. |
| 2. | Enzyme action is specific. |
| 3. | Enzymes are denaturized by ultraviolet rays at high temperatures. |
| 4. | Enzymes are least reactive at an optimum temperature. |
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Heterogeneous catalysis is shown in:
| 1. | \(2SO_{2}{(g)} \ + \ O_{2}{(g)} \ \xrightarrow[]{Pt(s)} \ 2SO_{3}{(g)}\) |
| 2. | \(4NH_{3}{(g)} \ + \ 3H_{2}{(g)} \ \xrightarrow[]{Fe(s)} \ 2NH_{3}{(g)}\) |
| 3. | \(Vegetable \ oil(l) \ + \ H_{2}(g) \ \xrightarrow[]{Ni(s)} \ Vegetable \ ghee(s)\) |
| 4. | All of the above |
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KClO3 on heating decomposes into KCl and O2. If some MnO2 is added, the reaction goes much faster because:
1. MnO2 decomposes to give oxygen.
2. MnO2 provides heat by reacting.
3. Better contact is provided by MnO2
4. MnO2 acts as a catalyst.
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The compound that acts as an inhibitor for knocking in the combustion of petrol is:
1. (C2H5)4Pb
2. Ni(CO)4
3. Both (1) and (2)
4. None of the above.
A small amount of phosphoric acid can be used to prevent H2O2 decomposition. This an example of?
1. Neutralization
2. Negative catalysis
3. Positive catalysis
4. Catalytic poisoning
The active species in Zeigler-Natta polymerisation of ethylene is:
1. AlCl3
2. Et3Al
3. H2C=CH2
4. Ti+3
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- 1(current)
Q. No.
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