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

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.

How will you convert: Propene to Propan-2-ol?

Calculate the e.m.f. of the following cell at 298 K:

Fe(s) | Fe²⁺ (0.001 M) | | H⁺ (0.01 M) | H₂(g) (1 bar) | Pt(s)

Given that \[\ce{E^0_{cell}}\] = 0.44 V

[log 2 = 0.3010, log 3 = 0.4771, log 10 = 1]

For a first order reaction, show that time required for 99% completion is twice the time required for the completion of 90% of reaction.

 A first order reaction takes 40 minutes for 30% decomposition. Calculate t_1/2 for this reaction. (Given log 1.428 = 0.1548)

Write the fomulae of the following compounds

Sodium hexanitrito- N - cobaltate (III)

Write the chemical equation involved in the following reaction:

Hoffmann-bromamide degradation reaction

Write the structures of A and B in the following reactions:

Complete the following equations:

Complete the following equations: Cr₂O₇^2- + 14H⁺ + 6I →

Using IUPAC norms, write the formula for the following: 

Potassium tetracyanidonickelate(II)

Name the reagents used in the following reactions:

Complete the following equation:

\[\ce{2MnO4- + 6H+ + 5NO2- ->}\]

Illustrate the following reaction giving suitable example in each case:Gabriel phthalimide synthesis

A first order reaction takes 23.1 minutes for 50% completion. Calculate the time required for 75% completion of this reaction.

(log 2 = 0.301, log 3 = 0.4771, log 4 = 0.6021)

When chromite ore FeCr₂O₄ is fused with NaOH in presence of air, a yellow-coloured compound (A) is obtained, which on acidification with dilute sulphuric acid gives a compound (B). Compound (B) on reaction with KCl forms an orange coloured crystalline compound (C).

(i) Write the formulae of the compounds (A), (B) and C.

(ii) Write one use of compound (C).

Complete the following chemical equation

8MnO₄^- + 3S₂O₃^2- + H₂O →