Science (English Medium) कक्षा १२ - CBSE Question Bank Solutions for Chemistry

Give the structures of A, B and C in the following reactions:

Although phenoxide ion has more number of resonating structures than carboxylate ion, carboxylic acid is a stronger acid than phenol. Give two reasons.

How would you account for the following:

The chemistry of actinoids is more complicated as compared to lanthanoids.

Write the structures of main products when benzene diazonium chloride `(C_6H_5N_2^(+)Cl^-)`reacts with the following reagents:

CuCN/KCN

Write the structures of main products when benzene diazonium chloride `(C_6H_5N_2^(+)Cl^-)`reacts with the following reagents:

H₂O

Write the structures of main products when benzene diazonium chloride `(C_6H_5N_2^(+)Cl^-)`reacts with the following reagents:

CH₃CH₂OH

Give a reason for the following: 

Actinoids show irregularities in their electronic configurations.

Write the structures of A, B and C in the following:

Why pKa of F-CH₂-COOH is lower than that of Cl−CH₂−COOH?

What happens when the external pressure applied becomes more than the osmotic pressure of solution?

Blood cells are isotonic with 0.9% sodium chloride solution. What happens if we place blood cells in a solution containing

(i) 1.2% sodium chloride solution?

(ii) 0.4% sodium chloride solution?

How would you account for the following:

Actinoid contraction is greater than lanthanoid contraction.

Why do actinoids show a wide range of oxidation states?

Write on similarity between the chemistry of lanthanoids and actinoids.

Distinguish between the following : Benzoic acid and methyl benzoate

A solution containing 15 g urea (molar mass = 60 g mol^–1) per litre of solution in water has the same osmotic pressure (isotonic) as a solution of glucose (molar mass = 180 g mol^–1) in water. Calculate the mass of glucose present in one litre of its solution.

With reference to structural variability and chemical reactivity, write the differences between lanthanoids and actinoids

Give the structures of A, B and C in the following reaction:

Explain the following term with a suitable example:

F-centres

If NaCl is doped with 10⁻³ mol % of SrCl₂, what is the concentration of cation vacancies?