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 zoology human influences on the environment carbon cycle ozone layer depletion and causes depletion of ozone layer

Substitute of chlorofluorocarbon is

  1. Hydrofluorocarbon

  2. Hydrochlorofluorocarbon

  3. Fluorocarbon

  4. Both A and B
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
Chlorofluorocarbons (CFC) are the chemicals used as refrigerants. They cause ozone depletion as they release chloride radicals which on reacting with ozone causes its degradation.
The chlorofluorocarbons can be substituted by Hydrofluorocarbon (HFC) or Hydrochlorofluorocarbon (HCFC) for using as refrigerants and in air conditioners. Though HFCs and HCFCs also deplete ozone but to lesser extent than CFCs.
Hence, both options A and B are correct.
So, the correct answer is 'Both A and B'.
Multiple choice chemistry nitrogen and sulfur nitrogen gas component of air - nitrogen nitrogen

Which of the following is an explosive compound of $N _2$?

  1. $N _2O _5$
  2. $NH _3$
  3. $NF _3$
  4. $NCl _3$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

$NCl _3$ is explosive. 

Halogen in the +1 oxidation state is a good oxidizing agent and it can oxidize the nitrogen to the highly stable $N _2$ and get itself reduced to $Cl _2$ , both stable gases with a release of energy.
Therefore, NCl3 is explosive.

Hence, option (D) is the correct answer.

Multiple choice chemistry nitrogen and sulfur nitrogen gas component of air - nitrogen nitrogen

Which one of the following statement is not correct for  $N _{2}$?

  1. It has small size

  2. It is a typical non metal

  3. It does not eadily react with oxygen

  4. d-orbitals are available for bonding
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

d-orbitals are not available for bonding in N. 
there are not any 2d orbitals 
Electronic configuration: $1s^{2} 2s^{2} 2p^{3}$

Multiple choice chemistry nitrogen and sulfur nitrogen gas component of air - nitrogen nitrogen

The mixed anhydride of nitrogen is:

  1. ${N} _{2}{O} _{2}(2NO)$
  2. ${N} _{2}{O} _{4}(2{NO} _{2})$
  3. ${N} _{2}{O} _{5}$
  4. ${N} _{2}{O} _{2}$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
Mixed anhydride or double acid anhydride is the compound that reacts with water to form a mixture of two acidic anhydride.
Two oxides of nitrogen are acid anhydrides; that is, they react with water to form two nitrogen-containing oxyacids.

$2NO _2 + H _2O \longrightarrow HNO _3 + HNO _2$
 
Hence, the correct option is B.
Multiple choice evs look, learn and experience matter: states, classification and properties study of matter general introduction: importance and scope of chemistry

Which of the following is a compound?

  1. Baking soda

  2. Octane

  3. Hydrogen peroxide

  4. All of above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Hydrogen peroxide is formed when two atoms of hydrogen form a bond with two atoms of oxygen that have bonded to each other. Octane is a hydrocarbon consisting of hydrogen and carbon. Sodium bicarbonate (baking soda) can be produced from the reaction of carbon dioxide with an aqueous solution of sodium hydroxide, which creates sodium carbonate; it is then combined with carbon dioxide molecules to produce sodium bicarbonate. All the compounds are made up of different elements and have properties different from their constituent element.

Multiple choice evs look, learn and experience matter: states, classification and properties study of matter general introduction: importance and scope of chemistry

Which of the following is an ionic compound?

  1. ${ SO } _{ 3 }$
  2. $ICl$
  3. $KI$
  4. ${ CHCl } _{ 3 }$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
An ionic compound is composed of cation and anion and by the electrostatic force of attraction. But after formation, cation attracts the electron pair towards itself and cause some deformation of electron density of anion. Above all if the ionic character predominates over covalent character, then we call it ionic.

$KI$ consist of $K^+ $ cations  and $I^-$ anions.

The bond is purely ionic and the compound is ionic.


Option C is correct.

Multiple choice oxoacids of halogens p- block elements-ii p-block elements the p-block elements chemistry

The correct statement (s) regarding, $\left( i \right)\,\,HCIO\,\,\,\,\left( {ii} \right)\,\,\,HCI{O _2}\,\,\,\,\left( {iii} \right)\,\,\,HCI{O _3}$ and $\left( {iv} \right)\,\,\,HCI{O _4}$, is 

  1. The number of $CI=O$ bond in $(ii)$ and $(iii)$ together is two.
  2. The numbers of lone pairs of electrons on $CI$ in $(ii)$ and $(iii)$ together is three.
  3. The hybridization of $CI$ in $(iv)$ is $s{p^3}$.
  4. Amongst $(i)$ to $(iv)$, the strongest acid is $(i)$.
Reveal answer Fill a bubble to check yourself
B Correct answer