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Chemistry MCQs Quiz For Entry Test
1. The substance that alters the rate of a chemical reaction but recovered unchanged at the end is called a:
Reactant
Catalyst (Answer)
Product
Promoter
2. Half life period of a first order reaction is independent of:
Conditions of temperature
Initial concentration of the compound (Answer)
Presence of catalyst
All of the above
3. A pseudo uni-molecular reaction has order of reaction:
1 (Answer)
3
2
0
4. Which property of a liquid is measured by polarimeter:
Conductance
Refractive index
Change in volume
Optical activity (Answer)
5. The rate determining step is the:
Moderate step
Fastest step
Slowest step (Answer)
Slowest step and Fastest step
6. When NaOH solution reacts with aluminium in different physical states most rapid reaction occurs:
Aluminium powder (Answer)
Aluminium foil
Alloy of aluminium
Cubes of aluminium
7. Catalyst changes:
Enthalpy of reactions
Enthalpy of none
Enthalpy of products (Answer)
Enthalpy of reactants
8. A zero order reaction is one in which:
Concentration of reactant do not change with passage of time.
Rate is not affected by changing concentration of reactants. (Answer)
One reactant s in large excess.
Reactants do not react.
9. A white precipitate of silver chloride immediately formed on addition of:
Silver chloride solution to sodium nitrate solution.
Silver nitrate solution to potassium chloride solution.
Silver nitrate solution to sodium chloride solution. (Answer)
Silver nitrate solution to hydrogen chloride solution.
10. When rate of reaction is restarted by adding a substance, it is said to be:
Negative catalyst (Answer)
Auto catalyst
Positive catalyst
Catalyst
11. The example of a photochemical reaction is photosynthesis has order of reaction:
3
1
0 (Answer)
2
12. The unit of the rate constant is the same as that of rate of reaction in:
Third order reaction
First order reaction
Second order reaction
Zero order reaction (Answer)
13. Which of the following will affect the rate:
Last step of reaction
First step of reaction
Rate determining step (Answer)
Fastest step
14. All reactions occur in:
Two step
A series of steps
A single step and A series of steps (Answer)
A single step
15. Which of the following reactions occur at moderate rate:
Rusting of iron
Fermentation of sugars
Hydrolysis of an ester (Answer)
Chemical weathering of stone work of buildings by acidic gases in atmosphere.
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