| 1 |
Rate of chemical reaction depends upon :
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A. The number of total collisions per second.
B. Number of molecules taking part in a chemical reaction.
C.Number of fruitful collisions per second
D. Number of fruitless collisions per second.
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| 2 |
Which of the following reactions occur at moderate rate :
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A. Rusting of iron
B. Chemical weathering of stone work of buildings by acidic gases in atmosphere.
C.Hydrolysis of an ester
D. Fermentation of sugars
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| 3 |
Half life period of a reaction is inversely proportion to the initial concentration of the reactant, then order of reaction is
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A. Third order
B. Second order
C.Fist order
D. Zero order
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| 4 |
Refrectrometric method is used when
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A. Reactions involving absorption of I.R. or U. V
B. Reactions involving change of refractive index
C.Reactions involving ions
D. Change of optical activity
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| 5 |
The actual number of atoms or molecules taking part in rate determining step is
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A. Rate of reaction
B. Velocity of reaction
C.Order of reaction
D. Molecularly
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| 6 |
When we perform the same reaction by taking two different initial concentrations of a reactant for a second order reaction then
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A. Reaction becomes exothermic
B. Energy of activation is different
C.Mechanism of reaction is changed
D. Half life period is changed
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| 7 |
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A. 1st order
B. 2nd order
C.Zero order
D. 3rd order
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| 8 |
A catalyst is a substance which increase the rate of a chemical reaction, but remains unchanged at the end of reaction, nut remains unchanged at the end of reaction, because
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A. It increases the temperature
B. It increase the surface area
C.It increases the rate constant
D. It decrease the energy energy of activation
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| 9 |
The rate equation for a reaction is Rate =k[A]. what are unit of K ?
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A. Mole-1 dm3 S-1
B. Mole dm3 S-1
C. Mole dm3
D. S-1
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| 10 |
Which of the following is not affected by light
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| 11 |
The unit of rate constant K ismole-1
dm3for a chemical reaction, the order of reaction is :
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A. Order of reaction can determined by an experiment
B. Order of reaction can determined from a balance equation only.
C.Order of reaction can determined increases by increasing temperate.
D. Order of reaction must be in whole number and not in fraction.
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| 12 |
Factor which slows down the rate of reaction is
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A. Small size of the particles of the reactant
B. High temperature of reaction
C.More concentration of reactant
D. Lowering the temperature
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| 13 |
For effective collisions the molecules slow down before collision and their kinetic energy decreases which results in increase in their
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A. Activation energy
B. Average energy
C.Potential energy
D. Collisions frequency
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| 14 |
The example of a photo chemical reaction is photosynthesis has order of reaction :
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A. 1
B. 2
C.0
D. 3
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| 15 |
Platinum is poisoned by
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A. Arsenic
B. Silver
C.Argon
D. Zinc
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| 16 |
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A. Rate is independent of concentration of water since it is in excess
B. Rate is independent of concentration of ester since it is in exces
C.Rate depends upon the concentration of acid catalyst added
D. Rate = k[CH3COOC2H5]1/2[H2O]1/2
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| 17 |
The rate of reaction :
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A. Increase as the reaction proceeds.
B. Decreases as the reaction proceeds.
C.Remains the same as the reaction proceed.
D. May decrease or increase as the reaction proceeds.
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| 18 |
A white precipitate ofsilver chlorideimmediately formed on additionof :
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A. Silver nitrate solution to sodium chloride solution.
B. Silver chloride solution to sodium nitrate solution.
C.Silver nitrate solution to potassium chloride solution
D. Silver nitrate solution to hydrogen chloride solution.
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| 19 |
When the rate of reaction is entirely independent of the conc. of reaction molecules then order of reaction is
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A. Zero
B. First
C.Second
D. Third
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| 20 |
With increases in temperature of 10 K of the reacting gases the rate of reaction is doubled because
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A. Increase in number of collisions
B. Number of molecules having energy more than Ea is doubled
C.Increase in order of reaction
D. Increase in surface area
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| 21 |
For a chemical reaction to take place the particles must have sufficient energy for the effective collisions, the energy is called
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A. Average energy
B. Activation energy
C.Potential energy
D. Collision energy
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| 22 |
In the hydrolysis of CH3COOC2H5the acid produced is
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A. Inhibitor
B. Catalyst
C.Auto catalyst
D. None of above
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| 23 |
It rate law of an equation is written asdx/dt=K[A][B]
?
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A. Reaction is independent of the concentration of A and B.
B. Product is decreasing with passage of time.
C.Reactant in increasing with passage of time.
D. Reactant is increasing with passage of time.
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| 24 |
Value of rate constant k is specific for a reaction, and varies from reaction to reaction. The value of k of a reaction changes with
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A. Time
B. Temperature
C.Concentration of reactants
D. Order of reaction
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| 25 |
Optical rotation method is sued when
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A. Reaction involve ions
B. Change of refractive indices
C.Reactions involving change of optical activity
D. None of the above
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| 26 |
Hydrolysis of ethyl-acetate (ester) has order of reaction :
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A. 3
B. 2
C.1
D. 1
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| 27 |
Which of the following factors does not influenced the rate of reaction
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A. Concentration of the reaction
B. Nature of the reactants
C.Molecularity of the reaction
D. Temperature
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| 28 |
Which statement is true about order of reaction :
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A. Order of reaction can only be determined by an experiment.
B. Order of reaction can be determined from a balance equation only.
C.Order of reaction increase by increasing temperature.
D. Order of reaction must be in whole number and not in fraction.
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| 29 |
It is common observation that rates of chemical reactions differ :
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A. Greatly.
B. A little bit.
C.Moderately.
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| 30 |
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A. First order
B. Pseudo first order
C.Second order
D. Zero order
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