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

Classify the following amine as primary, secondary or tertiary:

(C₂H₅)₂CHNH₂

Calculate the molarity of the following solution: 

30 mL of 0.5 M \[\ce{H2SO4}\] diluted to 500 mL.

Explain the ligand.

Explain the following, giving two examples:

Coordination polyhedron

Explain the following, giving two examples:

Coordination number

Explain the following, giving two examples: 

Homoleptic

Give two examples of unidentate ligands.

What is meant by didentate ligand?

Give two examples of didentate ligands.

Give two examples of ambidentate ligands.

What are interstitial compounds?

Write the differences between physisorption and chemisorption with respect to the following: 

(i) Specificity

(ii) Temperature dependence

(iii) Reversibility and

(iv) Enthalpy change

Which metal in the first transition series (3d series) exhibits + 1 oxidation state most frequently and why?

Which of the following cations are coloured in aqueous solutions and why ?

Sc³⁺, V³⁺, Ti⁴⁺, Mn²⁺ (At. Nos. Sc = 21, V = 23, Ti = 22, Mn = 25)

How would you account for the following? 

Transition metals exhibit variable oxidation states.

Complete the following chemical equations:

`(i) Cr_2O_7^(2-)+6Fe^(2+)+14H^+ ->`

`(ii) 2CrO_4^(2-)+2H^+ ->`

`(iii) 2MnO_4^-+5C_2O_4^(2-)+16H^+ ->`

Pb(NO₃)₂ on heating gives a brown gas which undergoes dimerisation on cooling? Identify the gas

Account for the following:

Mn shows the highest oxidation state of +7 with oxygen but with fluorine, it shows oxidation state of +4.

Account for the following: 

Cr²⁺ is a strong reducing agent.

Account for the following:

Cu⁺² salts are coloured, while Zn²⁺ salts are white.