Q1. For a certain reaction a plot of ([c_0-c])/c against time t, yields a straight line. c_0 and c are concentrations of reactant at t=0 and t=t respectively. The rate of reaction is:
  •  1
  •  3
  •  0
  •  2
For II order reaction (c_0-c)/c=K∙t∙c_0.

Q2.For the first order reaction with the rate constant k, which expression gives the rate half-life period? (Initial conc. = a)
  •  1/k
  •  0.693/k
  •  1/ka
  •  3/2 ka^2

Q3.  The reaction; N_2 O_5 in 2NO_2+1/2〖 O〗_2 (g) is of first order for N_2 O_5 with rate constant 6.2×〖10〗^(-4) s^(-1). What is the value of rate of reaction when [N_2 O_5 ]=1.25 mole L^(-1)?
  •   5.15×〖10〗^(-5) mole L^(-1) s^(-1)
  •  6.35×〖10〗^(-3) mole L^(-1) s^(-1)
  •  3.85×〖10〗^(-4) mole L^(-1) s^(-1)
  •  7.75×〖10〗^(-4) mole L^(-1) s^(-1)
r=K[N_2 O_5 ]=6.2×〖10〗^(-4)×1.25=7.75×〖10〗^(-4) M/s

Q4. For the reaction, H_2+I_2→2HI, the differential rate law is
  •  -d[H_2 ]/dt=-d[I_2 ]/dt=-(d[HI])/dt
  •  -d[H_2 ]/dt=-(d[I_2])/dt=(d[HI])/dt
  •  -d[H_2 ]/dt=-2 (d[I_2])/dt=1/2(d[HI])/dt
  •  -d[H_2 ]/dt=-(d[I_2])/dt=1/2(d[HI])/dt

Q5.For a reaction between gaseous compounds, 2A+B→C+D The reaction rate=k[A][B]. If the volume of the container is made 1/4 of the initial, then what will be the rate of reaction as compared to the initial rate?
  •  16 times
  •  4 times
  •  1/8 times
  •  1/16 times
 When volume is reduced to one fourth, concentration become four times. Hence, the rate of reaction becomes 16 times as compared to the initial rate.

Q6. For zero order reaction the integrated rate equation is
  •  kt=[A]/[A]_0
  •  [A]=-kt+[A]_0
  • [A]=kt-[A]_0
  •  kt=[A]-[A]_0

Q7.Which order of reaction obeys the relation t_(1/2)=1/Ka?
  •  First
  •  Zero
  •  Second
  •  Third

Q8.For a I order reaction A⟶B the reaction rate at reactant concentration 0.01M is found to be 2.0×〖10〗^(-5) Ms^(-1). The half-life period of the reaction is:
  •  30s
  •  347s
  •  300s
  •  220s
rate=K[A]^1 K=(2.0×〖10〗^(-5))/0.01=2.0×〖10〗^(-3) s^(-1) ∴ t_(1/2)=0.693/(2×〖10〗^(-3) )=347s .

Q9.The half-life of two samples is 0.1 and 0.4 s. Their reactive concentration is 200 and 50 respectively. What is the order of reaction?
  •  4
  •  0
  •  1
  •  2





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