Free MCQs & Online Quiz Practice for Exams

Q: Natural gas is mainly composed of

A) CH₄

B) C₂H₈

C) C₂H₆

D) C₂H₂

Q: Catenation is the linkage of carbon with other

A) Oxygen atoms

B) Carbon atoms

C) Nitrogen atoms

D) Halogens

Q: oxygen is bonded on both sides to Carbon atom in

A) Alcohol

B) Ketone

C) Aldehyde

D) Ether

Q: At dynamic equilibrium

A) The reverse reaction stops

B) The forward reaction stops

C) Both forward and reverse reactions stop

D) Both forward and reverse reactions continue at the same rate

Q: A reversible reaction have the following characteristics except

A) They proceed in both directions

B) They never complete

C) Products do not form reactants again again

D) They are represented by ⇌

Q: The equilibrium constant (Kc) is:

A) The sum of the two reactants

B) The difference of the two rate constants

C) The ratio of the two rate constants

D) The product of the two rate constants

Q: When the value of Kc is very small it shows that

A) Reaction will go in the forward direction

B) Reaction will go in the reverse direction

C) Reaction is at equilibrium

D) Equilibrium will never establish

Q: For which reaction the Kc will have no units?

A) 4NH₃(g) + 5O₂(g) ⇌ 4NO(g) + 6H₂O(g)

B) N₂(g) + 3H₂(g) ⇌ 2NH₃(g)

C) N₂(g) + O₂(g) ⇌ 2NO(g)

D) CO(g) + 3H₂(g) ⇌ CH₄(g) + H₂O(g)

Q: When the value of Kc is very large it shows that

A) Reaction is at equilibrium

B) Equilibrium will never be achieved

C) Reaction will move in the forward direction

D) Reaction will go in the reverse direction

Q: Active mass means

A) The total mass of reactants

B) The total mass of products

C) The total mass of products and reactants

D) Concentration of reactants and products in moles per dm³ in a dilute solution

Q: The reaction between PCl₃ and Cl₂ will produce PCl₅(g). The units of Kc for this reaction are

A) mol.dm⁻³

B) mol⁻¹.dm⁻³

C) mol⁻¹.dm³

D) mole.dm³

Q: What is the radian measure between the arms of watch at 5.00 pm?

A) 1 radian

B) 2 radian

C) 3 radian

D) 4 radian

Q: 1° =

A) 0.01745 radian

B) 1 radian

C) 3.14 radian

D) 2π radian

Q: The metric prefix for 0.000001 is

A) hecto

B) micro

C) deca

D) nano

Q: Which of the following is the CORRECT way of writing units?

A) 71 Newton

B) 12 mu s

C) 8 Kg

D) 43 kg m⁻³

Q: A student measures a distance several times. The readings lie between 49.8 cm and 50.2 cm. This measurement is best recorded as

A) (49.8±0.2) cm

B) (49.8±0.4) cm

C) (50.0±0.2) cm

D) (50.0±0.4) cm

Q: The percent uncertainty in the measurement of (3.76±0.25) m is

A) 4%

B) 6.60%

C) 25%

D) 376%

Q: The temperatures of two bodies measured by a thermometer are t₁=(20±0.5)℃ and t₂=(50±0.5)℃. The temperature difference and the error therein is

A) 30℃±0.0℃

B) 30℃±0.5℃

C) 30℃±1℃

D) 30℃±1.5℃

Q: (5.0 m±4.0%) × (3.0 s±3.3%) =

A) 15.0 ms±13.2%

B) 15.0 ms±7.3%

C) 15.0 ms±0.7%

D) 15.0 ms±15.3%

Q: (2.0 m±2.0%)³ =

A) 8.0 m³±1.0%

B) 8.0 m³±2.0%

C) 8.0 m²±5.0%

D) 8.0 m³±6.0%