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

Explain the following term with suitable examples: 

Frenkel defect

Explain the following term with a suitable example:

Interstitials

Boiling point of water at 750 mm Hg is 99.63°C. How much sucrose is to be added to 500 g of water such that it boils at 100°C? Molal elevation constant for water is 0.52 K kg mol⁻¹.

Write the chemistry of recharging the lead storage battery, highlighting all the materials that are involved during recharging.

Explain the term with suitable examples:

Alcosol

Explain the term with suitable examples:

Aerosol

Explain the term with suitable examples:

Hydrosol

Aqueous copper sulphate solution (blue in colour) gives a green precipitate with aqueous potassium fluoride. Explain this experimental result.

A solution of [Ni(H₂O)₆]²⁺ is green but a solution of [Ni(CN)₄]²⁻ is colourless. Explain.

[Fe(CN)₆]⁴⁻ and [Fe(H₂O)₆]²⁺ are of different colours in dilute solutions. Why?

What will be the correct order for the wavelengths of absorption in the visible region for the following?

[Ni(NO₂)₆]⁴⁻, [Ni(NH₃)₆]²⁺, [Ni(H₂O)₆]²⁺

How do you explain the amphoteric behaviour of amino acids?

Describe a method for the identification of primary, secondary and tertiary amines. Also write chemical equations of the reactions involved.

Give a plausible explanation for the following:

Why do primary amines have higher boiling points than tertiary 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.