Free MCQs & Online Quiz Practice for Exams

Q: 1 M solution of Ca(OH)2 is mixed with 1 M solution of HCl. The product solution is

A) Acidic

B) Basic

C) Neutral

D) Amphoteric

Q: Cl⁻ is the conjugate base of

A) AlCl3

B) NaCl

C) HCl

D) KCl

Q: pH of an aqueous solution is 9. Its pOH is

A) 11

B) 9

C) 7

D) 5

Q: Salt of a weak base and strong acid has a pH approximately

A) 8

B) 6

C) 7

D) 9

Q: The unit of Kw is

A) mol·dm⁻³

B) mol²·dm⁻⁶

C) mol²·dm⁻⁶

D) mol²·dm³

Q: A very large Ka value means that the substance is a

A) Strong acid

B) Weak acid

C) Weak base

D) Strong base

Q: In the following halogen acids which one is the strongest acid?

A) HF

B) HCl

C) HBr

D) HI

Q: Which one of the following solutions has pH = 0?

A) 1 M HCl

B) 0.5 M H2SO4

C) 0.1 M HNO3

D) 1 M CH3COOH

Q: Which one is NOT true for acids?

A) Liberate H⁺

B) Accept electrons

C) Have high pH

D) Turn blue litmus red

Q: 10⁻³ moles of HNO₃ is dissolved per dm³. Its pH is

A) -3

B) 5

C) 3

D) 1

Q: A solution with a pKa value of 9 suggests that it is (best interpretation)

A) Strong acid

B) Strong base

C) Weak base

D) Strong base

Q: An acidic buffer solution can be prepared by mixing

A) A weak acid and its salt (salt from the strong base)

B) A strong acid and its salt with a weak base

C) A weak base and its salt with a strong acid

D) A strong base and its salt with a weak acid

Q: Activated complex is a substance which is

A) Stable

B) Unstable

C) Can be isolated

D) Can exist as product

Q: A reaction is first order with respect to A and second order with respect to B, the rate equation is

A) rate = k[A][B]²

B) rate = k[A]²[B]

C) rate = k[A][B]

D) rate = k[A]

Q: For a reaction A → Product, doubling the concentration of A quadruples the rate. The reaction is

A) First order

B) Second order

C) Zero order

D) Third order

Q: With the increase in temperature, the rate of reaction increases due to

A) Decrease in collisions

B) Decrease in activation energy

C) Increase in kinetic energy of the molecules

D) More number of molecules attain activation energy

Q: You can speed up a reaction by

A) Using less concentrated solution

B) Lowering the temperature

C) Using more concentrated solution

D) Stopping stirring

Q: When the catalyst and reactants are in different physical phases, we call the catalysis

A) Heterogeneous

B) Homogeneous

C) Concentrated

D) Positive catalysis

Q: Increasing the temperature increases the rate of reaction by

A) Lowering the activation energy

B) Increasing the activation energy

C) Lowering the frequency of effective collisions

D) Increasing the frequency of effective collisions

Q: The energy needed to start the reaction is called

A) Potential energy

B) Activation energy

C) Kinetic energy

D) Ionization energy