All Free Chemistry MCQs with Answers

• A. Redox reaction
• B. Precipitation reaction
• C. Substitution reaction
• D. Free radical reaction

Explanation: To determine whether such a reaction is a redox reaction, the oxidation states of the reactants and products is compared.

• A. Colligative
• B. None of these
• C. Constitutive
• D. Additive

Explanation: Boiling point elevation is a colligative property which means it depends on the presence and the number of dissolved particles and not on…

• A. All of these
• B. Have proper orientations
• C. Have proper energies
• D. Be in a homogenous mixture

Explanation: The collision theory states that for particles to take part in a chemical reaction, they must collide with one another, have sufficient…

• A. 0.55
• B. 0.1
• C. 10
• D. 1

Explanation: 0.55: This option suggests a molarity of 0.55 for the glucose solution.

• A. Option A
• B. Option B
• C. Option C
• D. Option D

Explanation: The solubility product constant, Ksp , is the equilibrium constant for a solid substance dissolving in an aqueous solution.

• A. Remains the same
• B. Increases
• C. First increases, then decreases
• D. Decreases

Explanation: When a solute is dissolved in a solvent, the freezing point of the solution decreases compared to the pure solvent.

• A. Molar masses
• B. Volumes
• C. Pressures
• D. Masses

Explanation: Boiling point elevation is a colligative property that depends on the number of solute particles in a solution.

• A. Compound
• B. Solution
• C. Molecule
• D. Solid

Explanation: Mole fraction is the ratio of moles of a particular component to the total number of moles of a solution.

• A. Per dm3 of water
• B. In one gram of water
• C. Per m3 of water
• D. In 100 ml of water

Explanation: Molarity is the number of moles of any substance dissolved in 1 dm3 of water.

• A. 100.52 °C
• B. 100.00 °C
• C. 100.052 °C
• D. Less than 100 °C

Explanation: Mass of glucose = 18 g Mass of solvent = 1 kg Boiling point of pure water = 100°C n (glucose) = 18 / [6(12) + 12(1) + 6(18)] = 18 /180 =…

• A. 1.86
• B. 2.86
• C. 11.86
• D. 0.52

Explanation: The molal freezing point depression constant for H2O, Kf , is given as 1.86 °C kg/mole.

• A. 2.75 x 10^-2
• B. 2.75 x 10^2
• C. 1.17 x 10^-2
• D. 3.63 x 10^3

Explanation: The solubility product constant (Ksp) expression for Ca(OH)2is: Ca(OH)2(s) ⇌ Ca2+(aq) + 2OH-(aq) The Ksp expression can be written as: Ksp…

• A. M𝑔𝐶𝑂3
• B. A𝑙2(𝐶𝑂3)3
• C. K2𝐶𝑂3
• D. 𝑍𝑛𝐶𝑂3

Explanation: The solubility of compounds in pure water depends upon their respective lattice energy.

• A. 0.1m
• B. 1.0m
• C. 10.0m
• D. Statement is wrong

Explanation: According to the formula for the elevation of boiling point ∆Tb=kb×m Where kb is the ebullioscopic constant and m is the molality of the…

• A. 𝑀𝑔(𝑂𝐻)2
• B. 𝐻2𝐶𝑂3
• C. N𝐻4𝐶𝑙
• D. N𝐻4𝑂H

Explanation: Strong bases are defined as the base which completely dissociates when dissolved in water and is a strong electrolyte.

• A. Molality
• B. Mole Fraction
• C. Molarity
• D. Both Molality and Molarity

Explanation: Molarity of a solution depends upon temperature because volume of a solution is temperature dependent.

• A. Ordinary filter paper
• B. Coarse filter paper
• C. Fine Filter paper
• D. Extremely fine filter paper

Explanation: Colloidal particles are small solid particles that are suspended in a fluid phase. Their size range is typically between 10nm.

• A. Saturated solution
• B. Super saturated solution
• C. Buffer solution
• D. Dilute solution

Explanation: A buffer solution is a solution that resists changes in pH when small amounts of acid or base are added to it.

• A. 6.50-7.00
• B. 7.20 - 7.25
• C. 7.50 - 7.55
• D. 7.35-7.40

Explanation: knowledge-based question Human blood acts as a buffer and it can maintain a pH between 7.3 and 7.4

• A. poor conductor
• B. very good conductor
• C. slight conductance
• D. neutral

Explanation: Pure water is a poor conductor of electricity. It has a low concentration of ions, primarily H+ and OH− ions resulting from the…