All Free Chemistry MCQs with Answers

• A. Endothermic
• B. Exothermic
• C. Irreversible
• D. Slow

Explanation: The change in enthalpy of Haber process is negative and there is a release of energy upon completion, therefore, it is "exothermic" and…

• A. Law of Mass Action
• B. Catalyst
• C. Le chatelier's Principle
• D. All of these

Explanation: Le Chatelier's principle states that if a dynamic equilibrium is disturbed by changing the conditions, the position of equilibrium shifts…

• A. +878 kJ mol-1
• B. -1942 kJ mol-1
• C. -878 kJ mol-1
• D. -2474 kJ mol-1

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

• A. Joule's law
• B. Law of conservation of energy
• C. Hess's law
• D. Henry's law

Explanation: According to Hess's law, the thermal effects of a reaction depends upon the initial and final conditions of the reacting substances.

• A. Cube
• B. Pentagon
• C. Hexagon
• D. Tetrahedron

Explanation: The shape of CH4 is tetrahedron and the four Hydrogen atoms lie at the four corners of a tetrahedron.

• A. Methane
• B. Ethane
• C. Alkyne
• D. None of these options are correct

Explanation: The hybridization of methane molecules occurs by mixing one orbital with three p orbitals.

• A. Ethane
• B. Ethyne
• C. Ethene
• D. Cyclopropane

Explanation: C2H4 is a planar molecule and each bond angle is about 120 degrees.

• A. BF3
• B. C2H4
• C. BeCl2
• D. CH4

Explanation: Explanation for this question will be added soon.

• A. sp3
• B. sp
• C. sp2
• D. dsp

Explanation: The carbon atoms in alkanes are sp3 hybridized, and have tetrahedral shapes, with the bonded atoms at angles of 109.5° to each other.

• A. sp2
• B. sp3
• C. sp
• D. All of these

Explanation: Option: A In benzene, the carbon atom is joined to two other similar carbon atoms instead of just one.

• A. Sp3
• B. Sp2
• C. Sp
• D. Sp2d

Explanation: Ethyne molecule is sp hybridized since it has one sigma and two carbon-carbon pi bonds. Hence, option C is correct.

• A. Acetone
• B. Acetonitrile
• C. Acetic acid
• D. Acetamide

Explanation: Acetonitrile has a nitrile group (-CN), where the carbon is sp hybridized. The nitrogen is also sp hybridized.

• A. 1
• B. 2
• C. 3
• D. 4

Explanation: In the ethyne molecule (C2H2), each carbon atom is sp hybridized to form a triple bond between them.

• A. sp2
• B. sp3
• C. sp
• D. None of these

Explanation: The sp2 hybridization is the mixing of one s and two p atomic orbitals, which involves the promotion of one electron in the s orbital to…

• A. 109.5˚
• B. 180˚
• C. 90˚
• D. 120˚

Explanation: In sp2 hybridization, the orbital orientation is: 120 degrees. During sp2 hybridization, one s orbital and two p orbitals in the valence…

• A. 1
• B. 2
• C. 3
• D. 4

Explanation: In the formation of ethyne molecule, both the carbon atoms undergo sp-hybridization having two unhybridized orbital i.e., 2py and 2px.

• A. Acetone
• B. Acetonitrile
• C. Acetic acid
• D. Acetamide

Explanation: The structural formula of molecules is shown. Only acetonitrile is the one that does not have sp2 hybridization while others do contain…

• A. London dispersion Forces
• B. Dipole dipole forces
• C. Hydrogen bonding
• D. All of the above options are correct

Explanation: When two ice cubes are pressed over each other, they unite to form one cube, Hydrogen bonding is responsible for it.

• A. London dispersion forces
• B. Hydrogen bonding
• C. Dipole dipole forces
• D. Covalent bonding

Explanation: The water can form 4 hydrogen bonds as the intermolecular forces of interaction with other molecules.

• A. Dipole induced Dipole inter action
• B. London dispersion forces
• C. Intra molecular H - bonding
• D. Inter molecuar H - bonding

Explanation: The boiling of a compound is raised by Intermolecular hydrogen bonding.