PUC Science 2nd PUC Class 12 - Karnataka Board PUC Question Bank Solutions for Chemistry

Discuss the nature of bonding in metal carbonyls.

Where does the water present in the egg go after boiling the egg?

What is the effect of denaturation on the structure of proteins?

Account for the following:

Diazonium salts of aromatic amines are more stable than those of aliphatic amines.

Predict the product of the following reaction:

\[\ce{CH3 - CH2 - CH2 - O - CH3 + HBr ->}\]

Predict the product of the following reaction:

Predict the product of the following reaction:

\[\ce{(CH3)3C - OC2H5 ->[HI]}\]

Show how will you synthesize cyclohexylmethanol using an alkyl halide by an S_N2 reaction.

Write the equation of the reaction of hydrogen iodide with 1-propoxypropane.

Write the equation of the reaction of hydrogen iodide with methoxybenzene.

Write the equation of the reaction of hydrogen iodide with benzyl ethyl ether.

Explain the fact that in aryl alkyl ethers 

1. the alkoxy group activates the benzene ring towards electrophilic substitution and
2. it directs the incoming substituents to ortho and para positions in the benzene ring.

Why does O₃ act as a powerful oxidising agent?

How is O₃ estimated quantitatively?

Which aerosols deplete ozone?

Determine the osmotic pressure of a solution prepared by dissolving 2.5 × 10⁻² g of K₂SO₄ in 2L of water at 25°C, assuming that it is completely dissociated.

(R = 0.0821 L atm K⁻¹ mol⁻¹, Molar mass of K₂SO₄ = 174 g mol⁻¹)

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