Organic Compounds Containing Nitrogen — Chemistry STD 12 Science — Question

Why chloroform is kept in the dark in coloured bottle?

Note: In the following questions a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.

1. Both assertion and reason are true and the reason is the correct explanation of assertion.
2. Both assertion and reason are true and the reason is not the correct explanation of assertion.
3. Assertion is true but the reason is false.
4. Both assertion and reason are false.
5. Assertion is false but reason is true.

Assertion: Conductivity of all electrolytes decreases on dilution.
Reason: On dilution number of ions per unit volume decreases.

Why molecularity is applicable only for elementary reactions and order is applicable for elementary as well as complex reactions?

What is meant by 'disproportionation'? Give two examples of disproportionation reaction in aqeuous solution.

Answer the following:
(a) For a certain reaction large fraction of molecules has energy more than the threshold energy, yet the rate of reaction is very slow. Why?
(b) State a condition under which a bimolecular reaction is kinetically first-order reaction.

Explain as to why haloarenes are much less/reactive than haloalkanes towards nucleophilic substitution reactions.

Compare the chemistry of the actinoid with that of lanthanoids with reference to:
Oxidation states.

Which methods are usually employed for purifying the following metals?
(i) Nickel, (ii) Iron
Mention the principles.

Write a note on Double Helical structure of DNA.