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

Calculate Δ_rG^° for the reaction 

Mg (s) + Cu²⁺ (aq) → Mg²⁺ (aq) + Cu (s)

Given : E^°_cell = + 2.71 V, 1 F = 96500 C mol^–1

Define the following terms as related to proteins :

Peptide linkage

Why is it essential to wash the precipitate with water before estimating it quantitatively?

Discuss briefly, giving an example of the role of coordination compounds in medicinal chemistry.

Draw the structure of the given derivative.

Acetaldehydedimethylacetal

Discuss briefly, giving an example of the role of coordination compounds in analytical chemistry.

Discuss briefly, giving an example of the role of coordination compounds in extraction/metallurgy of metals.

What happens when: SO₂ gas is passed through an aqueous solution Fe⁺³ salt?

Write the structures of A and B in the following reactions

Predict the products of the following reactions:

Name the reagents used in the following reactions:

3.9 g of benzoic acid dissolved in 49 g of benzene shows a depression in freezing point of 1.62 K. Calculate the van't Hoff factor and predict the nature of solute (associated or dissociated).

(Given : Molar mass of benzoic acid = 122 g mol⁻¹, K_f for benzene = 4.9 K kg mol⁻¹)

Calculate the amount of benzoic acid (C₆H₅COOH) required for preparing 250 mL of 0.15 M solution in methanol.

19.5 g of CH₂FCOOH is dissolved in 500 g of water. The depression in the freezing point of water observed is 1.0°C. Calculate the van’t Hoff factor and dissociation constant of fluoroacetic acid.

What are enzymes?

Account for the following:

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

Show how the following compound can be converted to benzoic acid.

Ethylbenzene

Show how the following compound can be converted to benzoic acid.

Acetophenone

Show how the following compound can be converted to benzoic acid.

Bromobenzene

Show how the following compound can be converted to benzoic acid.

Phenylethene (Styrene)