Chemistry

Chemical Bonding and Molecular Structure

1,420 Questions

This section tests your knowledge of chemical bonding, molecular structure, and hybridization. It covers ionic and covalent bonds, octet rule exceptions, and molecular geometry. These chemistry questions are common in various competitive entrance examinations.

Ionic and covalent bondsHybridisation of elementsOctet rule exceptionsMolecular geometryIntermolecular forces

Chemical Bonding and Molecular Structure Questions

Multiple choice

When a cation is formed from a neutral atom, its size

  1. increases

  2. decreases

  3. remains same

  4. depends on the group to which the ion formed belongs
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The number of protons remaining the same the effective nuclear charge increase. Hence the size of the ion becomes smaller than thesize of the neutral atom

Multiple choice

Assertion (A) Na+ and Al3+ are isoelectronic but the magnitude of ionic radius of Al3+ is less than that of Na+. Reason (R) The magnitude of effective nuclear charge of the outershell electrons in Al3+ is greater than that in Na+.

  1. Both (A) and (R) are true and (R) is the correct explanation of (A).

  2. Both (A) and (R) are true but (R) is not the correct explanation of (A).

  3. (A) is true but (R) is false.

  4. (A) is false but (R) is true.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

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Multiple choice

Which of the following accepts terminal electron?

  1. Molecular oxygen

  2. Molecular water

  3. Molecular CO2

  4. NADPH2

  5. -
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Oxygen is the terminal electron acceptor in photosynthesis. In oxygenic photosynthesis, the first electron donor is water that creates oxygen as a waste product.

Multiple choice

Which of the following compounds is the most volatile?

  1. H2O

  2. H2S

  3. H2Se

  4. H2Te
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Volatility increases from H2O to H2S and then decreases to H2Po. H2S > H2Se > H2Te > H2Po > H2O The least volatility and high boiling point of water is due to hydrogen bonds.