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

Which one of the following has the highest dipole moment?

What is the covalence of nitrogen in N₂O₅?

Bond angle in `PH_(4)^(+)` is higher than that in PH₃. Why?

Why does the reactivity of nitrogen differ from phosphorus?

How is nitrogen prepared in the laboratory? Write the chemical equations of the reactions involved.

Give the resonating structure of N₂O₅.

How would you account for the following? 

Zr (Z = 40) and Hf (Z = 72) have almost identical radii.

How would you account for the following? 

Transition metals and their compounds act as catalysts.

In the complexes `[Fe(CN)_6]^(3-)` and `[pt(en) (H_2O)_2(NO_2 (Cl)^(2+)]``the respective oxidation numbers of central metal atoms are

1) +3 and +4

2) +6 and + 4

3) +6 and +3

4) +3 and + 3

Describe the oxidising action of potassium dichromate and write the ionic equation for its reaction with iron (II) solution.

Describe the oxidising action of potassium dichromate and write the ionic equation for its reaction with H₂S.

For M²⁺/M and M³⁺/M²⁺systems, the E^Θ values for some metals are as follows:

Use this data to comment upon:

The ease with which iron can be oxidised as compared to a similar process for either chromium or manganese metal.

Decide which of the following atomic numbers are the atomic numbers of the inner transition elements:

29, 59, 74, 95, 102, 104

Compare the general characteristics of the first series of the transition metals with those of the second and third series metals in the respective vertical columns. Give special emphasis on the following point:

Oxidation states

Compare the general characteristics of the first series of the transition metals with those of the second and third series metals in the respective vertical columns. Give special emphasis on the following point:

Ionisation enthalpies

Compare the general characteristics of the first series of the transition metals with those of the second and third series metals in the respective vertical columns. Give special emphasis on the following point:

Atomic sizes

Give an example of chelate effect.

Write the formula of Tetraminodichloroplatinum (IV) chloridex.

Sucrose decomposes in acid solution to give glucose and fructose according to the first order rate law. The half life of the reaction is 3 hours. Calculate fraction of sucrose which will remain after 8 hours.