All Free Chemistry MCQs with Answers

• A. Butane
• B. Butanone
• C. Butene
• D. Butyne

Explanation: Butane is the first hydrocarbon for which branching is possible, and it has the formula C4H10, hence the simplest compound out of all the…

• A. Tautomerism
• B. Metamerism
• C. Geometrical isomerism
• D. Position isomerism

Explanation: b) Metamerism: Metamerism is a type of isomerism where two or more compounds have the same molecular formula but differ in the arrangement…

• A. Reforming
• B. Isomerism
• C. Polymorphism
• D. Hybridization

Explanation: Isomerism is the existence of molecules that have the same numbers of the same kinds of atoms (and hence the same formula) but differ in…

• A. 2.44
• B. 23.2
• C. 48.93
• D. 2.32

Explanation: The ratio of the rate of diffusion of the given gases is 0.58:0.55 or 1.112.

• A. 4
• B. 16
• C. 10.5
• D. 30

Explanation: According to Graham's law of diffusion; RH2/RO2 = √MO2/ √MH2 RH2/RO2 = √32/√2 = 4. Hence, the correct option is A.

• A. Plasma state
• B. Liquid state
• C. Solid state
• D. Super condensed state

Explanation: a) Plasma state:In intense electric fields and at very high temperatures, matter can exist in a plasma state.

• A. 16
• B. 36
• C. 6
• D. 24
• E. 72

Explanation: The explanation for this question will be added soon.

• A. Solids
• B. Liquid
• C. Gases
• D. All of these options are correct

Explanation: Gases have the weakest intermolecular forces while these forces are at intermediate level in liquids and strongest in solids.

• A. Kinetic theory of gases
• B. Crystal field theory
• C. Molecular orbital theory
• D. Transition state theory

Explanation: KMT of gases suggests that idea that molecules are in constant motion

• A. Translational motion
• B. Vibrational motion
• C. Rotational motion
• D. Linear motion

Explanation: OPTION A: There is no translational motion in solids due to strong intermolecular forces.OPTION B: According to Kinetic Molecular…

• A. Repulsive force
• B. Interacting force
• C. Creative force
• D. None of these

Explanation: Option B is correct since each state of matter has a different strength of interacting forces; the strength of the force is maximum in…

• A. High
• B. Low
• C. Moderate
• D. Same

Explanation: The effusion of a gas is its movement through an extremely small opening of molecular size into a region of low pressure.

• A. Berzelius
• B. William Crooks
• C. Dalton
• D. Rutherford

Explanation: The existence of 'the fourth state of matter' was first identified by Sir William Crookes in 1879.

• A. High
• B. Low
• C. Moderate
• D. Same

Explanation: Effusion is the movement of a gas, from a region of high pressure, through an extremely small opening of molecular size into a region of…

• A. Low temperature
• B. High temperature
• C. Low pressure
• D. High pressure

Explanation: Plasma is an ionized gas that only occurs at "high temperatures" so it is difficult to maintain it at "low temperatures".

• A. NaCl
• B. NaBr
• C. Nal
• D. NaF

Explanation: Explanation for this question will be added soon.

• A. Atomization
• B. Neutralization
• C. Lattice energy
• D. Solution

Explanation: Explanation for this question will be added soon.

• A. Remains unchanged
• B. Changes
• C. Decreases
• D. Increases

Explanation: Option B is correct since Avogadro's law states that under the same conditions of temperature and pressure, equal volumes of different…

• A. Increasing reactant concentrations.
• B. Equal number of reactant and product gas molecules.
• C. Increasing temperature.
• D. Using a catalyst.

Explanation: Increasing the temperature will either increase or decrease the concentration of the reactants or products depending on whether the…

• A. Towards the product side
• B. toward the reactant side.
• C. Towards the middle.
• D. None of these

Explanation: When heat is removed, the temperature of the system is lowered, and that favors the exothermic reaction, which, according to Le…