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 biology natural disasters: winds, storms and cyclones composition of air introduction to air natural resources - air

Which of the following compounds produce $N _2$ on strong heating?

  1. $NaNO _2$
  2. $NaNO _3$
  3. $NH _4NO _2$
  4. $AgNO _3$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The thermal decomposition of sodium nitrite to produce sodium oxide(III), nitrogen and oxygen. This reaction takes place at a temperature of $700-900°C.$

$4NaN{ O } _{ 2 }→2{ Na } _{ 2 }O+2{ N } _{ 2 }+3{ O } _{ 2 }$

Multiple choice chemistry chemical changes electrochemical reactions electrolysis and its applications electrolytic cells and electrolysis

Aqueous solution of nickel sulphate contains $Ni^{2+}$ and ${SO _{4}}^{2-}$ ions. Which ion moves towards the cathode?

  1. $Ni^{2+}$
  2. ${SO _{4}}^{2-}$

  3. both A and B

  4. none of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
 Reaction at cathode (Reduction)  Reaction at Anode (Oxidation)
 Ions at cathode : $Ni^{2+} , H^+$ Preferential discharge of $Ni^{2+}$ ions takes place. $Ni^{2+} (aq) + 2e^- \rightarrow Ni^0(s)$Nickel metal deposits on the article. i.e. nail.  Ions at anode : $SO _4^{2-} , OH^-$$Ni^0 (s) - 2e^- \rightarrow Ni^{2+} (aq)$$Ni^{2+}$ ions are formed at anode.

None of the above ions discharge at anode ; instead Ni atoms of the anode lose electrons to form $Ni^{2+}$ ions.

Multiple choice chemistry biomolecules enzymes and hormones hormones coordination in human beings- chemical control

Which bond angle $\theta $ gives maximum dipole moments for triatomic molecule $XY _{ 2 }$ :-

  1. $\theta \quad =\quad 90^{ \circ }$
  2. $\theta \quad =\quad 120^{ \circ }$
  3. $\theta \quad =\quad 180^{ \circ }$

  4. Both 2 and 3
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

For a triatomic molecule XY2, the dipole moment is the vector sum of individual bond dipoles. When the bond angle theta is 90 degrees, the vector sum of the two bond dipoles is maximized because the angle creates a sharper resultant vector compared to a linear 180-degree arrangement where the dipoles cancel out completely.

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.