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

What is meant by the chelate effect? Give an example.

What is meant by the chelate effect? Give an example.

Calculate the standard cell potential of a galvanic cell in which the following reaction takes place:

\[\ce{Fe{^{2+}_{(aq)}} + Ag{^{+}_{(aq)}} -> Fe{^{3+}_{(aq)}} + Ag_{(s)}}\]

Calculate the Δ_rG° and equilibrium constant of the reaction.

Why are interstitial compounds well known for transition metals?

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.

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]