Chemistry

Chemical Bonding and Molecular Structure

1,277 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

Which of the following elements do not form pentachloride?

  1. Nitrogen and phosphorus

  2. Arsenic and phosphorus

  3. Arsenic and bismuth

  4. Nitrogen and bismuth

  5. Nitrogen and antimony
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Both nitrogen and bismuth do not form pentachlorides. Nitrogen with n = 2, has s and p orbitals only. It does not have d orbitals to expand its covalence beyond four. That is why it does not form pentahalide. In bismuth, +5 oxidation state is not stable due to the inert pair effect. So, Bi does not form pentahalides (except BiF5).

Multiple choice

Which of the following fluorides are ionic in nature?

  1. CF4 and SiF4

  2. SiF4 and SnF4

  3. PbF4 and GeF4

  4. SnF4 and PbF4

  5. SiF4 and GeF4<!--?xml:namespace prefix = o /--><o:p></o:p>
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Most of the MX4 type halides of group 14 elements are covalent in nature. Exceptions are SnF4 and PbF4, which are ionic in nature.

Multiple choice

Which of the following is the most stable compound?

  1. Oxyhaemoglobin

  2. Carboxyhaemoglobin

  3. Carbaminohemoglobin

  4. None of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Carbon monoxide combines with haemoglobin to form carboxy-haemoglobin, which cuts down the capacity of blood to transport oxygen.

Multiple choice

Which of the following statements is not correct about the theory of electrolytic dissociation?

  1. Cations and anions are formed as a result of dissociation of electrolyte in water.

  2. All ions carry an electric charge and are responsible for the flow of current.

  3. The conductivity of electrolyte is independent of the concentration of ions in the solution.

  4. The degree of dissolution is the extent to which an electrolyte dissociates.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The conductivity of the electrolyte depends upon the concentration of ions in solution.

Multiple choice

Which of the following statements is incorrect about electrolytes such as HCl, H2SO4 and HNO3?

  1. These allow a large amount of electricity to flow through them.

  2. These are poor conductors of electricity.

  3. These are almost completely dissociated in fused or aqueous state.

  4. Their solutions contain almost only free mobile ions.

  5. None of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The given substances are examples of strong electrolytes and strong electrolytes are good conductors of electricity.

Multiple choice

In which of the following spectroscopy techniques does the transition occur between magnetic energy levels of paired electrons in a molecule?

  1. Electron spin resonance spectroscopy

  2. Nuclear Magnetic Resonance spectroscopy

  3. Raman spectroscopy

  4. Infrared spectroscopy

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

This answer is correct as in electron spin resonance the transition occurs between magnetic energy levels of paired electrons and region of EM spectrum is microwave. It involves the detection of physical phenomenon of absorption of electromagnetic radiation in microwave region by paramagnetic species.