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Law of mass action MCQ Basic level

Dear Readers,

Compared to other sections, Chemistry is considered to be the most scoring section. If prepared thoroughly, chemistry can help students to secure a meritorious position in the exam. These questions are very important in achieving your success in Exams after 12th.

Q1.The active mass of a reactant is

•  Its gram molecular weight
•  Its equivalent weight
•  Per litre number of moles
•   None of these

Per litre number of moles

Q2. In a reaction the rate of reaction is proportional to its active mass, this statement is known as

•  Law of mass action
•  Le- chatelier principle
•  Faraday law of electrolysis
•  Law of constant proportion

Law of mass action

Q3. The law of mass action was enunciated by

•  Guldberg and Waage
•  Bodenstein
•  Berthelot
•  Graham

Guldberg and Waage

Q4. Theory of ‘active mass’ indicates that the rate of chemical reaction is directly proportional to the

•  Equilibrium constant
•  Properties of reactants
•   Volume of apparatus
•   Concentration of reactant

Concentration of reactant

Q5. 240g of urea is present in 10 litre solution the active mass of urea will be

•  0.2 mol/litre
•  0.06 mol/litre
•  0.4 mol/litre
•   0.08 mol/litre

0.4 mol/litre

Q6.  According to law of mass action, the rate of a reaction is directly proportional to

•  Molarities of the reactants
•  Normalities of the reactants
•  Molalities of the reactants
•  Mole fractions of the reactants

Molarities of the reactants

Q7. The number of gram molecules of substance present in unit volume is termed as

•  Activity
•  Normal solution
•  Molar concentration
•  Active mass

Molar concentration

Q8.  The active mass of 64 gm of HI in a two litre flask would be

•  2
•  1
•  5
•  0.25

0.25

Q9. 120 gm of urea are present in 5 litre solution, the active mass of urea is

•  0.2
•  0.06
•  0.4
•  0.08

0.2

Q10. Active mass is given as, {If f = activity coefficient & CM= Molarity}

•  a = f CM
•  a = r CM
•  Amount of substance per unit Volume
•  Number of g mol per 100 litre

Amount of substance per unit Volume