Coordination Compounds — Chemistry STD 12 Science — Question

How will you convert :
(i) Ethanoic acid into methanamine
(ii) Hexanenitrile into 1-aminopentane
(iii) Methanol to ethanoic acid
(iv) Ethanamine into methanamine

The experimental data for decomposition of N₂O₅
[2N₂O₅ → 4NO₂ + O₂]
in gas phase at 318K are given below:

t/s	0	400	800	1200	1600	2000	2400	2800	3200
102 × [N2O5]/mol L-1	1.63	1.36	1.14	0.93	0.78	0.64	0.53	0.43	0.35

1. Plot [N₂O₅] against t.
2. Find the half-life period for the reaction.
3. Draw a graph between log[N₂O₅] and t.
4. What is the rate law?
5. Calculate the rate constant.
6. Calculate the half-life period from k and compare it with (ii).

Discuss the different chemical properties of amines.

Why is it not possible to obtain pure ethanol by fractional distillation? What general name is given to binary mixtures which show deviation from Raoult’s law and whose components cannot be separated by fractional distillation. How many types of such mixtures are there?

i. Tert-Butylamine cannot be prepared by the action of NH₃ on tert-butyl bromic. Explain why?
ii. Suggest a convenient method for the preparation of tert-butylamine.

CoSO₄Cl.5NH₃ exists in two isomeric forms ‘A’ and ‘B’. Isomer ‘A’ reacts with AgNO₃ to give white precipitate, but does not react with BaCl₂. Isomer ‘B’ gives white precipitate with BaCl₂ but does not react with AgNO₃. Answer the following questions.

1. Identify ‘A’ and ‘B’ and write their structural formulas.
2. Name the type of isomerism involved.
3. Give the IUPAC name of ‘A’ and ‘B’.

Prove that the relative depression of vapour pressure is equal to the mole fraction of solute.

Describe a method for the identification of primary, secondary and tertiary amines. Also write chemical equations of the reaction involved.

All energetically effective collisions do not result in a chemical change. Explain with the help of an example.