3.

Fill in the blanks choosing appropriate words given in brackets :  
 [water, ethylamine, aniline, amino acids, nucleic acids, sodium chloride, caesium chloride, sulphur dioxide, copper, diamond, graphite, peptide, glycosidic, geometric, chain, optical, position, hydrogen bonding, inductive, mesomeric],

(i) Crystals of________and_________have face centered cubic lattices.

(ii) Examples of structural isomerism are________isomerism and________isomerism

(iii) _______is more basic than NH₃ because of__________effect.

(iv) Boiling point of_______is more than that of H₂S because of_______.

(v) Proteins are made up of________units held together by________linkages.

• Always slows down a reaction.
• Starts a reaction that does not occur in its absence.
• Changes the relative concentration of the reactants and products at equilibrium.
• Changes the relative concentration of the reactants and products at equilibrium.

• Bauxite
• Fluorspar
• Feldspar
• Feldspar

• Concentration 
• Calcination
• Refining 
• Refining 

Complete the following sentences by selecting the correct alternative from the choices given:

When hydrogen sulphide reacts with sulphur dioxide to give sulphur and water :

• Both H₂S and SO₂ are oxidised

• Both H₂S and SO₂ are reduced

• H₂S is oxidised and SO₂ is reduced

• H₂S is reduced and SO₂ is oxidized.

• Condensation  
• Reduction
• Hydrolysis
• Hydrolysis

Correct the following statements: 

Osmotic pressure and boiling point are colligative properties.

Correct the following statements: 
The rate constant of any reaction is proportional to the concentration of the reactants.