First Order Reaction
Trending Questions
Q. For a first order reaction A(g)→2B(g)+C(g) at constant volume and 300 K, the total pressure at the beginning (t= 0) and at time t are P0 and Pt, respectively. Initially, only A is present with concentration [A0], and t13 is the time required for the partial pressure of A to reach 13rd of its initial vlaue. The correct option(s) is (are) (Assume that all these gases behave as ideal gases)
Q. The rate of a first order reaction has been found to be 2.45×10−6molL−1s−1at concentration C1. The value of C1 is (rate constant = 3.5×10−5)
- 7molL−1
- 0.7molL−1
- 0.07molL−1
- 2.1molL−1
Q. The rate of a first order reaction R→Pis 7.5×10−4molL−1s−1 when the concentration of R is 0.5 mol L−1.
The rate constant is
The rate constant is
- 4.16×10−7s−1
- 2.5×10−5s−1
- 1.5×10−5s−1
- 1.5×10−3s−1
Q. The reaction : A → B follows first order kinetics. The time taken for 0.8 mol of A to produce 0.6 mol of B is 1 hour. What is the time taken for conversion of 0.9 mol of A produce 0.675 mol of B?
- 1 hr
- 0.5 hr
- 0.25 hr
- 2 hr
Q. A reaction 2A+BK−→C+D is first order w.r.t. and second order w.r.t. . Initial conc. (t=0) of is C0 while is 2C0. If at as 300 minutes the conc. of C is C04 then rate expression at t = 300 minutes is
- R=7C30k16
- R=27C30k32
- R=247C30k64
- R=49C30k32
Q.
In the reaction, P + Q ⟶ R + S
the time taken for 75% reaction of P is twice the time taken for 50% reaction of P. The concentration of Q varies with reaction time as shown in the figure. The overall order of the reaction is
- 0
- 1
2
- 3
Q. The rate constant for a first order reaction is k=7×10−4s−1. The time taken for the reactant to be reduced to 14 of the initial concentration is
- 990 s
- 1980 s
- 445 s
- 2970 s
Q. What is the half life period of a radioactive substance if 87.5% of any given amount of the substance disintegrates in 40 minutes?
- 160 min
- 10 min
- 13.58 min
- 20 min
Q. 75% of a first order reaction was completed in 32 minutes. 50% of the reaction was complete in
- 4 min
- 8 min
- 16 min
- 24 min
Q. The rate for a first order reaction is 0.639×10−2mol dm−1min−1 and the initial concentration is 0.2 mol dm−3. The half-life period is
- 1200 s
- 20 s
- 600 s
- 0.33 s