Amines — Chemistry STD 12 Science — Question

Explain the terms ideal and non-ideal solutions in the light of forces of interactions operating between molecules in liquid solutions.

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’.

Explain the properties of vitamins and also classify them.

Explain the terms primary and secondary structure of proteins. What is the difference between α-helix and β-pleated sheet structure of proteins?

1. Describe the general trends in the following properties of the first series of the transition elements:

1. Stability of +2 oxidation state.
2. Formation of oxometal ions.

2. Assign reason for each of the following:

1. Transition elements exhibit variable oxidation states.
2. Transition metal ions are usually coloured.

Explain the various methods of determining the order of a reaction.

The air is a mixture of a number of gases. The major components are oxygen and nitrogen with approximate proportion of 20% is to 79% by volume at 298 K. The water is in equilibrium with air at a pressure of 10 atm. At 298 K if the Henry’s law constants for oxygen and nitrogen at 298 K are 3.30 × 10⁷ mm and 6.51 × 10⁷ mm respectively, calculate the composition of these gases in water.

 Match the compounds given in Column I with the oxidation state of cobalt present in it (given in Column II) and assign the correct code.

	Column I (Compound)		Column II (Oxidation state of Co)
a.	[Co(NCS)(NH3)5](SO3)	1.	+4
b.	[Co(NH3)4Cl2]SO4	2.	0
c.	Na4[Co(S2O3)3]	3.	+1
d.	[Co2(CO)8]	4.	+2
		5.	+3

Code:

1. A (1), B (2), C (4), D (5).
2. A (4), B (3), C (2), D (1).
3. A (5), B (1), C (4), D (2).
4. A (4), B (1), C (2), D (3).

How does colour appear in coordination compounds? Its explanation is based on crystal field theory.