\(2PbS+{ 3O }_{ 2 }\longrightarrow 2pbO+{ 2SO }_{ 2 }\) Name the process ________.

(a)

Roasting

(b)

Calcination

(c)

Smelting

(d)

Leaching

In graphite electrons are _______.

(a)

localised on each C-atom

(b)

localised on every third C-atom

(c)

delocalised within the layer

(d)

present in anti-bonding orbital

Repeated use of which one of the following fertilizers would increase the activity of the soil_______.

(a)

Ammonium sulphate

(b)

Superphosphate of lime

(c)

Urea

(d)

Potassium nitrate

Which one of the following exhibits highest oxidation state?

(a)

Ni

(b)

Mn

(c)

V

(d)

Zr

The name of [Pt^IV(NH₃)₂CI₂]²⁺is _______.

(a)

Diamminedichloroplatinum(IV) ion

(b)

Diamminedichloroplatinate (IV)

(c)

Diamminedichloroplatinum

(d)

Dichlorodiammineplatinum (IV) ion

Which of the following has an offensive odour?

(a)

Phenol

(b)

Benzy lalcohol

(c)

Acrolein

(d)

Benzyl benzoate

Glucose + aceticanhydrid \(\overset { pyridine }{ \longrightarrow } ?\)

(a)

di acetate

(b)

tetra acetate

(c)

penta acetate

(d)

hexa acetate

Cholesterol is an example of _________.

(a)

protein

(b)

vitamin

(c)

carbohydrat

(d)

lipid

The helical structure of protein is stabilised by_________

(a)

peptide bonds

(b)

disulphide bonds

(c)

hydrogen bonds

(d)

Vanderwaals inter action

The class of drugs used for the treatment of stress is _______

(a)

antihistamine

(b)

tranquilizens

(c)

antimicrobials

(d)

aminoglycosides