Previous Year Papers

Download Solved Question Papers Free for Offline Practice and view Solutions Online.

Test Series

Take Zigya Full and Sectional Test Series. Time it out for real assessment and get your results instantly.

Test Yourself

Practice and master your preparation for a specific topic or chapter. Check you scores at the end of the test.

Chemical Bonding and Molecular Structure

Long Answer Type

141.

Discuss the formation of compounds in which octet rule is violated.

153 Views

142.

Discuss the Modern(or Quantum) Theory of covalent bond.

99 Views

143. Explain the formation of H₂ molecule on basis of valence bond theory.
Or
In the light of attractive and repulsive forces, show that a molecule of hydrogen is formed.

966 Views

144. In the light of attractive and repulsive forccs, show that helium molecule is not formed.

192 Views

145.

What are general characteristics of covalent compounds?

118 Views

146.

Give the comparison between electrovalent and covalent bonds.

228 Views

147.

Give the comparison between Electrovalent (or ionic compounds) compounds and covalent compounds (special reference to properties).

220 Views

148.
Discuss the orbtial concept or quantum concept for the formation of covalent bond.
Or
Explain the formation of covalent bond on the basis of valence bond theory.

According to the orbital concept, a covalent bond is formed by the partial overlap of two half-filled atomic orbitals containing electrons with opposite spins. During the orbital overlap, a certain amount of enthalpy is released. Greater the enthalpy released, stronger will be the bond formed. The new orbital which gets formed as a result of orbital overlap is called molecular orbital. For example, in the formation of H₂ molecule, orbital of each hydrogen atom having electrons in opposite spin overlaps mutually as shown.