PUC Science 2nd PUC Class 12 - Karnataka Board PUC Important Questions

Explain why Cu⁺ ion is not stable in aqueous solutions?

How is the variability in oxidation states of transition metals different from that of the non-transition metals? Illustrate with examples.

Indicate the steps in the preparation of KMnO₄ from pyrolusite ore.

How would you account for the following? 

Transition metals and their compounds act as catalysts.

On adding NaOH to ammonium sulphate, a colourless gas with pungent odour is evolved, which forms a blue-coloured complex with Cu²⁺ ion. Identify the gas.

Write the IUPAC name of the given compound:

When a co-ordination compound CrCl₃.6H₂O is mixed with AgNO₃, 2 moles of AgCl are precipitated per mole of the compound. Write

(i) Structural formula of the complex.

(ii) IUPAC name of the complex.

Differentiate between adsorbtion and absorption.

Out of MgCl₂ and AlCl₃, which one is more effective in causing coagulation of negatively charged sol and why?

Out of sulphur sol and proteins, which one form multimolecular colloids?

Out of sulphur sol and proteins, which one form multimolecular colloids?

For the complex [Fe(CN)₆]^3–, write the hybridization type, magnetic character and spin nature of the complex. (At. number : Fe = 26).

Draw one of the geometrical isomers of the complex [Pt(en)₂Cl₂]²⁺ which is optically active.

Write the IUPAC name of the given compound :

Out of BaCl₂ and KCl, which one is more effective in causing coagulation of a negatively charged colloidal Sol? Give reason.

Write down the IUPAC name of the following complex: [Cr(NH₃)₂Cl₂(en)]Cl (en = ethylenediamine)

Write the formula for the following complex:

Pentaamminenitrito-O-Cobalt(III)

Draw the geometrical isomers of complex [Pt(NH₃)₂Cl₂].

Write the hybridization and magnetic behaviour of the complex [Ni(CO)₄].

(At.no. of Ni = 28)

Give reasons for the following observations: Leather gets hardened after tanning.