Class 9 Chemical kinetics CDF 1

For a reaction A->B,r=

• -dA/dt

• +dB/dt

• -dB/dt

• Both 1 and 2

Which can be determined graphically and at any time

• Average rate

• Instantaneous rate

• Slow rate

• Fast rate

Which is equal to the slope of a line drawn tangentto the concentration vs time curve at that time

• Average rate

• Instantaneous rate

• Slow rate

• Fast rate

Factors affecting rate of the reaction

• Nature of the reactants

• Temperature

• Light

• All the above

Which of the following affect the rate of the reaction as nature of the reactant

• Physical size of the reactant

• Ionic or covalent substances

• Both 1 and 2

• None

Among the solids , the rate increases with___in particle size

• Increase

• Decrease

• Remains same

• None

Among the solids the rate ----with decrease in size

• Increase

• Decrease

• Remains same

• None

In ____ state rate of the reaction is maximum

• Powdered state

• Plasma state

• Liquid state

• Gas state

In powdered state rate of the reaction is maximum is due to

• Increase in surface area

• Decrease in surface area

• Increase in density

• Decrease in density

Reaction between ionic substance is___than covalent substance.

• Slower

• Faster

• Both are same

• None