Ncert Solutions Chemistry Class 12th

This is a short answer type question as classified in NCERT Exemplar

Oxygen is more electronegative than sulphur, the bond angle of H₂O is greater, and the bod pair electron of an OH bond will be closer to oxygen, causing bond-pair repulsion between bond pairs of two OH bonds

This is a short answer type question as classified in NCERT Exemplar

Chlorine has vacant d-orbitals, which become excited upon bonding when electrons from the 3p-orbital are promoted to the 3d-orbital, giving it a covalency of three.

Due to the lack of unoccupied d-orbitals in the second energy shell, fluorine cannot expand its octet. As a result, it can only have one covalency.

This is a short answer type question as classified in NCERT Exemplar

NO₂ exists as a monomer with one unpaired electron in the gaseous state, but it dimerises to N₂O₄ in the solid state, leaving no unpaired electron, making the solid form diamagnetic.

This is a short answer type question as classified in NCERT Exemplar

Three P—Cl bonds are arranged in one plane at a 1200 angle. These bonds are known as equatorial bonds because they are formed between two points. The remaining two P—Cl bonds, one above the equatorial plane and the other below it, form  90° angle with the plane. Axial bonds are the name for these types of bonds. Because axial bond pairs are subjected to greater repulsive interaction than equatorial bond pairs, axial bonds are slightly longer and hence slightly weaker than equatorial bonds, making the PCl₅ molecule more reactive.

This is a short answer type question as classified in NCERT Exemplar

PH₃ is insoluble in water and cannot create hydrogen bonds with it, it forms bubbles, whereas NH₃ dissolves because it is soluble in water and can form hydrogen bonds with it.

This is a short answer type question as classified in NCERT Exemplar

This is a short answer type question as classified in NCERT Exemplar

4NH₃ + 5O₂ 4NO + 6H₂O

This is a short answer type question as classified in NCERT Exemplar

SO₃ generates a dense fog of sulphuric acid that does not condense quickly, it is not absorbed directly in water to form H₂SO_4.

This is a long answer type question as classified in NCERT Exemplar

A = NH₄NO₂

B = N₂

C = NH₃

D = HNO₃ 

(i) NH₄NO₂→N₂ + 2H₂O

(ii) N₂ + 3H₂→2NH₃

(iii) 4NH₃ + 5O₂→4NO + 6H₂O

4NO + O₂→4NO₂

3NO₂ + H₂O→2HNO₃ + NO