+91-87964 74404
FlagBACK
Question icon
Grade 12Physical Chemistry

Which of the following statements is/are false?

THIS QUESTION HAS MULTIPLE CORRECT OPTIONS

A) A fast reaction has a large rate constant and short half-life

B) Half life depends on concentration of reactants for first order reaction.

C) For a first order reaction, the half-life is independent of concentration

D) The half-life of a reaction is half the time required for the reaction to go to completion

Profile image of john wick
5 Years agoGrade 12
Answers icon

2 Answers

Profile image of Vikas TU
5 Years ago
Dear student 
For the first-order reaction, the half-life period is independent of the concentration of the reactants 
t half life = 0.693/K 
Hence, option B is false and option C is true.
Half-life is when half of the concentration is reacted not the half the time required for the reaction to go to completion.
Hence, the answers are B and D
Profile image of Vikas Amritiya
5 Years ago

The rate of a fast reaction is high. Hence, a fast reaction has a large rate-constant and short half-life. Thus option A is true.

For the first-order reaction, the half-life period is independent of the concentration of the reactants. t1/2
​=
​.0.693/k 
Hence, option B is false and option C is true.
Half-life is when half of the concentration is reacted not the half the time required for the reaction to go to completion.
 
Hence, the answers are B and D

Other Related Questions on physical chemistry

question mark
Which of the following aqueous solutions remains neutral after
electrolysis
physical chemistry
0 Answer Available

Last Activity: 3 Years ago

question mark
In the reaction A + 2B ⇌ 2C, if 2 moles of A, 3 moles of B and 2 moles of C are placed in a 2 L flask and
the equilibrium concentration of C is 0.5 mol/L. The equilibrium constant (KC) for the reaction is.....and please tell how you know that the reaction is going forward .. imean how to calculate the reaction quotient ???
 
physical chemistry
1 Answer Available

Last Activity: 3 Years ago

question mark
True or false when an electron in ground state of hydrogen atom is excited with an energy that is greayer than e2-e1 but less than e3-e1 the electron will get excited n=2
physical chemistry
1 Answer Available

Last Activity: 3 Years ago

question mark
18 19 gram mixture of na2co3 and nahco3 on heating gives 2.2 gram CO2 gas find the percent nahco3 (by mass) in mixture
physical chemistry
1 Answer Available

Last Activity: 4 Years ago

question mark
A 100 cm cube solution of sodium carbonate is prepared by dissolving 8.653 g of salt in water the density of solution is 1.0816g per ml what are the molarity and molality of the solution.
 
physical chemistry
1 Answer Available

Last Activity: 4 Years ago