Science (English Medium) Class 12 - CBSE Question Bank Solutions

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.

Draw the structure of the following derivative.

Acetaldehydedimethylacetal

Write the structure of the following compound.

Di-sec.butylketone

Draw the structure of the following derivative.

The ethylene ketal of hexan-3-one.

Write the structure of the compound whose IUPAC name is as follows:

4-Chloro-3-ethylbutan-1-ol

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: