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Chemistry M.C.Q (1 Marks)

Chemical Kinetics · CBSE STD 12 Science (CBSE - English Medium). 39 questions.

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M.C.Q (1 Marks)

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39 questions · timed · auto-graded

MCQ 11 Mark
It is used to express rate at any instant of time $\qquad$ ?
  • A
    initial rate
  • ✓
    instantaneous rate
  • C
    average rate
  • D
    standard rate
Answer
Correct option: B.
instantaneous rate
b
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MCQ 21 Mark
Used to express velocity at any instant of time :
  • A
    initial velocity
  • ✓
    instantaneous velocity
  • C
    average velocity
  • D
    standard velocity
Answer
Correct option: B.
instantaneous velocity
b
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MCQ 31 Mark
The graph between $\ln [R]$ and $t$ for the first order reaction is :
  • ✓
     Image
  • B
     Image
  • C
     Image
  • D
     Image
Answer
Correct option: A.
 Image
a
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MCQ 41 Mark
The graph between in $[R]$ and $t$ for the first order reaction is :
  • ✓
     Image
  • B
     Image
  • C
     Image
  • D
     Image
Answer
Correct option: A.
 Image
a
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MCQ 51 Mark
What is the order of integral rate reaction with expression $k =\frac{2.303}{t} \log \frac{[ R ]_0}{[ R ]}$ ?
  • A
    Zero order
  • ✓
    First order
  • C
    Second order
  • D
    Third order
Answer
Correct option: B.
First order
b
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MCQ 61 Mark
The slope of the graph for reaction (k) with time for a zero order reaction :
  • A
    $\frac{+k}{2.303}$
  • ✓
    - k
  • C
    $\frac{-k}{2.303}$
  • D
    + k
Answer
Correct option: B.
- k
b
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MCQ 71 Mark
For the reaction $2 A \rightarrow 3 B$, what is the reaction rate $-\frac{ d ( A )}{ dt }$ is equal to ?
  • A
    $\frac{+3 d[ B ]}{2 dt }$
  • ✓
    $\frac{+2}{3} \frac{d[ B ]}{ dt }$
  • C
    $\frac{+1 d[ B ]}{3 dt }$
  • D
    $+\frac{2 d[ B ]}{ dt }$
Answer
Correct option: B.
$\frac{+2}{3} \frac{d[ B ]}{ dt }$
b
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MCQ 81 Mark
The slope of the graph of $( k )$ with time for a zero order reaction is :
  • A
    $\frac{+ k }{2.303}$
  • ✓
    - k
  • C
    $\frac{-k}{2.303}$
  • D
    + k
Answer
Correct option: B.
- k
b
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MCQ 91 Mark
For reaction $2 A \rightarrow 3 B$ what is the reaction rate $-\frac{d(A)}{d t}$ equals to?
  • A
    $\frac{+3}{2} \frac{d( B )}{ dt }$
  • ✓
    $\frac{+2}{3} \frac{d( B )}{ dt }$
  • C
    $\frac{+1}{3} \frac{d( B )}{ dt }$
  • D
    $\frac{+2 d(B)}{ dt }$
Answer
Correct option: B.
$\frac{+2}{3} \frac{d( B )}{ dt }$
b
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MCQ 101 Mark
The expression $k =\frac{2.303}{ t } \log \frac{[ R ]_0}{[ R ]}$ is the integral velocity equation of the order of reaction :
  • A
    zero order
  • ✓
    first order
  • C
    second order
  • D
    third order
Answer
Correct option: B.
first order
b
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MCQ 111 Mark
The reaction speed rule is given $\frac{d P}{d t}=K[A][B]$ for $2 A+ B \longrightarrow$ Product $( P )$ when $[ B ] \gg[ A ]$, then order of reaction is this situation will be :
  • A
    0
  • ✓
    1
  • C
    2
  • D
    1.5
Answer
Correct option: B.
1
b
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MCQ 121 Mark
Find two third $\left( t \frac{2}{3}\right)$ life span for first order reaction (Given : $k =5.48 \times 10^{-14}$ second) :
  • ✓
    $2.00 \times 10^{13}$ second
  • B
    $200 \times 10^{13}$ second
  • C
    $200 \times 10^{20}$ second
  • D
    $0.200 \times 10^{10}$ second
Answer
Correct option: A.
$2.00 \times 10^{13}$ second
a
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MCQ 131 Mark
If a and $t \frac{1}{2}$ is the initial concentration of the reactants and the half-life of the zero order reaction respectively, then which of the following is the correct relationship?
  • A
    $t_{1 / 2} \propto \frac{1}{a}$
  • ✓
    $t_{1 / 2} \propto a$
  • C
    $t_{1 / 2} \propto \frac{1}{a^2}$
  • D
    $t_{1 / 2} \propto a^2$
Answer
Correct option: B.
$t_{1 / 2} \propto a$
b
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MCQ 141 Mark
By doubling the initial concentration of a reagent, its $t \frac{1}{2}$ becomes half. The order of this reaction will be :
  • A
    first order
  • B
    zero order
  • ✓
    second order
  • D
    third order
Answer
Correct option: C.
second order
c
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MCQ 151 Mark
The differential rate equation for the reaction $A+2 B$ $\longrightarrow$ product is :
  • A
    $\frac{-1 d[ A ]}{2} \frac{- d [ B ]}{ dt }= k [ A ][ B ]^2$
  • B
    $\frac{1}{2} \frac{d[ A ]}{ dt }=\frac{ d [ B ]}{ dt }= k [ A ][ B ]^2$
  • ✓
    $\frac{- d [ A ]}{ dt }=\frac{-1}{2} \frac{d[ B ]}{ dt }= k [ A ][ B ]^2$
  • D
    $\frac{ d [ A ]}{ dt }=\frac{1}{2} \frac{d[ B ]}{ dt }= k [ A ][ B ]^2$
Answer
Correct option: C.
$\frac{- d [ A ]}{ dt }=\frac{-1}{2} \frac{d[ B ]}{ dt }= k [ A ][ B ]^2$
c
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MCQ 161 Mark
The time taken to complete the zero order reaction is :
  • ✓
    $\frac{[ R ]_0}{ k }$
  • B
    $\frac{2 k }{[ R ]_0}$
  • C
    $[ R ]_0 k$
  • D
    None of these
Answer
Correct option: A.
$\frac{[ R ]_0}{ k }$
a
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MCQ 191 Mark
By doubling the initial concentration of reactant in a reaction, the half-life of that reaction also doubles as compared to before, then the order of this reaction will be :
  • A
    3
  • B
    Zero
  • ✓
    2
  • D
    1
Answer
Correct option: C.
2
c
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MCQ 211 Mark
The temperature dependence of the rate constant of a reaction is given by which of the following equation?
  • ✓
    $\ln k =\ln A -\frac{ E _{ a }}{ RT }$
  • B
    $\ln A =\ln k -\frac{ E _{ a }}{ RT }$
  • C
    $\ln k = A \frac{ E _{ a }}{ RT }$
  • D
    $\ln A = RT \ln E _{ a }-\ln k$
Answer
Correct option: A.
$\ln k =\ln A -\frac{ E _{ a }}{ RT }$
a
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MCQ 221 Mark
The factor affecting the activation energy of a reaction is :
  • A
    collision frequency
  • B
    concentration
  • C
    concentration
  • ✓
    heat
Answer
Correct option: D.
heat
d
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MCQ 231 Mark
For the reaction $2 A+ B \longrightarrow 3 C + D$, which of the following expressions does not represent the rate of the reaction :
  • A
    $-\frac{ d ( A )}{2 dt }$
  • B
    $-\frac{ d ( B )}{ dt }$
  • ✓
    $-\frac{ d ( C )}{ dt }$
  • D
    $+\frac{ d ( D )}{ dt }$
Answer
Correct option: C.
$-\frac{ d ( C )}{ dt }$
c
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MCQ 241 Mark
The minimum energy required to convert reactant molecules into products is :
  • A
    kinetic energy
  • B
    potential energy
  • ✓
    activation energy
  • D
    kinetic energy + potential energy
Answer
Correct option: C.
activation energy
c
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MCQ 251 Mark
The threshold energy for any chemical reaction is :
  • A
    Activation energy - normal energy of reactants
  • ✓
    Activation energy + normal energy of reactants
  • C
    Equal to activation energy
  • D
    Equal to the normal energy of the reactants
Answer
Correct option: B.
Activation energy + normal energy of reactants
b
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MCQ 261 Mark
The half-life of $C _{14}$ is 5760 years. After how many years will a 100 mg sample of ${ }^6 C _{14}$ be reduced to 25 mg ?
  • A
    1440 years
  • B
    23040 years
  • ✓
    11520 years
  • D
    None of these
Answer
Correct option: C.
11520 years
c
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MCQ 271 Mark
For the reaction $A + B =2 C$, the speed of extinction of A is $10^{-2}$ mole litre 'second', then what will be the speed of formation of C ?
  • A
    $1.5 \times 10^{-2}$ mole litre second $^{-1}$
  • B
    $0.5 \times 10^{-2} mole^{-1}$ litre second
  • C
    $1 \times 10^{-2}$ mole litre second
  • ✓
    $2.0 \times 10^{-1} mole litre ^{-1} sec ^{-1}$
Answer
Correct option: D.
$2.0 \times 10^{-1} mole litre ^{-1} sec ^{-1}$
d
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MCQ 281 Mark
Which of the following statements is true for a zero order reaction?
  • ✓
    Velocity $= k$
  • B
    Half-life $\left( t \frac{1}{2}\right) \propto \frac{1}{\text { Initialconcentration of reactant }}$
  • C
    Unit of $k =$ second $^{-1}$
  • D
    All of the above
Answer
Correct option: A.
Velocity $= k$
a
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MCQ 291 Mark
If the velocity of a reaction does not depend on the concentration of the reactants, then what will be the order of that reaction?
  • A
    1
  • ✓
    Zero
  • C
    2
  • D
    3
Answer
Correct option: B.
Zero
b
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MCQ 301 Mark
Example of zero order reaction :
  • A
    $H _2+ I _2 \longrightarrow 2 HI$
  • ✓
    $2 HI \xrightarrow[\Delta]{\Delta u } H _2= I _2$
  • C
    Alkaline hydrolysis of ester
  • D
    $C _2 H _{4(g)}+ H _{2(g)} \longrightarrow C _2 H _{6(g)}$
Answer
Correct option: B.
$2 HI \xrightarrow[\Delta]{\Delta u } H _2= I _2$
b
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MCQ 311 Mark
The half-life of first order reaction depends :
  • A
    on the concentration of reactants
  • B
    on the concentration of products
  • ✓
    at velocity constant
  • D
    on catalyst
Answer
Correct option: C.
at velocity constant
c
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MCQ 321 Mark
The rate constant of a reaction depends on which of the following?
  • A
    Concentration
  • ✓
    Pressure
  • C
    Temperature of reaction
  • D
    Nature of medium
Answer
Correct option: B.
Pressure
b
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MCQ 331 Mark
Activation energy of a reaction in the presence of a catalyst :
  • A
    increases
  • ✓
    decreases
  • C
    remains stable
  • D
    None of these
Answer
Correct option: B.
decreases
b
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MCQ 341 Mark
The unit of velocity of reaction is :
  • A
    mol litre
  • B
    mole second
  • ✓
    mole litre second
  • D
    mole litre second
Answer
Correct option: C.
mole litre second
c
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MCQ 351 Mark
The unit of rate constant of first order reaction is :
  • A
    minute
  • B
    mole litre second
  • ✓
    second
  • D
    None of these
Answer
Correct option: C.
second
c
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MCQ 361 Mark
The speed of reaction between x and y becomes 100 times. When the concentration of x is increased 10 times, then the order of the reaction with respect to x will be :
  • A
    10
  • ✓
    4
  • C
    2
  • D
    1
Answer
Correct option: B.
4
b
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MCQ 371 Mark
For the reaction $X + Y \longrightarrow$ Product, the velocity of the reaction $= K [ X ]^{ a }[ Y ]^{ b }$, then the order of the reaction will be :
  • A
    b
  • B
    a
  • ✓
    $a+b$
  • D
    None of these
Answer
Correct option: C.
$a+b$
c
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MCQ 381 Mark
If the half life of first order reaction is 100 seconds, then its rate constant will be :
  • ✓
    $6.93 \times 10^{-3} s$
  • B
    $6.93 \times 10^{-2} s$
  • C
    0.393 s
  • D
    6.93 s
Answer
Correct option: A.
$6.93 \times 10^{-3} s$
a
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MCQ 391 Mark
The order and molecular number of reaction of $CH _3 COOC _2 H _5+ H _2 O \xrightarrow{ H ^{+}} CH _3 COOH +$ $C _2 H _5 OH$ are respectively
  • A
    1,3
  • ✓
    1,2
  • C
    2,1
  • D
    2,2
Answer
Correct option: B.
1,2
b
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