In chemical equation H (g) + I (g) \(\rightleftharpoons\) 2HI (g) the equilibrium constant K depends on
  • total pressure
  • catalyst used
  • amount of H and I
  • temperature
If the rate of a reaction is expressed by, rate = A [A]² [B], the order of reaction will be
  • 2
  • 3
  • 1
  • 0
How long time will 5 g of this reactant take to reduce to 3 g?
  • 444 s
  • 400 s
  • 528 s
  • 669 s
A reaction in which reactants (R) are converted into products (P) follows second order kinetics. If concentration of R is increased by four times, what will be the increase in the rate of formation of P?
  • 9 times
  • 4 times
  • 16 times
  • 8 times
For a reaction nx – y → z the rate of reaction becomes twenty seven times when the concentration of X is increased three times. What is the order of the reaction?
  • 2
  • 1
  • 3
  • 0
The rate constant of a reaction depends upon
  • temperature of the reaction
  • extent of the reaction
  • initial concentration of the reactants
  • the time of completion of reaction
The unit of rate and rate constant are same fora
  • zero order reaction
  • first order reaction
  • second order reaction
  • third order reaction
The number of molecules of the reactants taking part in a single step of the reaction is indicative of
  • order of a reaction
  • molecuiarity of a reaction
  • fast step of the mechanism of a reaction
  • half-life of the reaction
Fora unimolecular reaction
  • the order and molecuiarity of the slowest step are equal to one
  • molecuiarity of the reaction can be zero, one or two
  • molecuiarity of the reaction can be determined only experimentally
  • more than one reacting species are involved in one step
The overall rate of a reaction is governed by
  • the rate of fastest intermediate’step
  • the sum total of the rates of all intermediate steps
  • the average of the rates of all the intermediate steps
  • the rate of slowest intermediate step
The order of reaction is decided by
  • temperature
  • mechanism of reaction as well as relative concentration of reactants
  • molecularity
  • pressure
Rate constant in case of first order reaction is
  • inversely proportional to the concentration units
  • independent of concentration units
  • directly proportional to concentration units
  • inversely proportional to the square of concentration units
Half life period of a first order reaction is 10 min. What percentage of the reaction will be completed in 100 min?
  • 25%
  • 50%
  • 99.9%
  • 75%
In pseudo unimolecular reactions
  • both the reactants are present in low concentration
  • both the reactants are present in same concentration
  • one of the reactant is present in excess
  • one of the reactant is non-reactive
A first order reaction takes 40 min for 30% decomposition. What will be t
  • 77.7 min
  • 52.5 min
  • 46.2 min
  • 22.7 min
Radioactive disintegration is an example of
  • zero order reaction
  • first order reaction
  • second order reaction
  • third order reaction
A plot of log (a – x) against time t is a straight line. This indicates that the reaction is of
  • zero order
  • first order
  • second order
  • third order
Rate of which reaction increases with temperature?
  • Exothermic reaction
  • Endothermic reaction
  • (a) and (b) both
  • None of the above
The activation energy in a chemical reaction is defined as
  • the difference in energies of reactants and products
  • the sum of energies of reactants and products
  • the difference in energy of intermediate complex with the average energy of reactants and products
  • the difference in energy of intermediate complex and the average energy of reactants
In a reaction, 2X → Y, the concentration of X decreases from 0.50 M to 0.38 M in 10 min. What is the rate of reaction in Ms
  • 2 × 10
  • 4 × 10
  • 1 × 10
  • 3 × 10
0 h : 0 m : 1 s

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