Placebo' is often given to patients. It is:

(1) an antidepressant

(2) a broad spectrum antibiotic

(3) a sugar pill

(4) a tonic

The antibiotic streptomycin is specific against:

(1) tuberculosis

(2) typhoid

(3) malaria

(4) AIDS

Various phenol derivatives, tincture of iodine (2-3% I₂ in water/alcohol) and some dyes like methylene blue are :

(1) antiseptics

(2) disinfectants

(3) analgesics

(4) antipyretics

The insecticide containing 99% $\mathrm{\gamma }$-isomer of benzene hexachloridc is known as:

(1) lindane

(2) TNT

(3) malathion

(4) methoxychlor

The poisonous gas evolved in Bhopal tragedy from the pesticide plant of Union Carbide Co. was:

(1) CO                   

(2) methyl isocyanate

(3) phosgene         

(4) chloropicrin

Oil of winter green and salol are the esters of:

1. salicylic acid

2. lactic acid

3. acetic acid

4. sulphanilic acid

Sulphaguanadine is used for:

(1) dysentery           

(2) urinary infections

(3) antiseptic           

(4) antipyretic

The correct statement among the following about Saccharin is -

1. It is also known as Ortho-sulphobenzimide

2. It is 550 times sweeter than sugar.

3. It is used as a sweetening agent.

4. All of the above.

Which of the following is an example of basic dye ?

(1) Alizarin

(2) Malachite green

(3) Indigo

(4) Orange I

Which of the following is not a chromophore?

(1) —N=N—

(2) —NO

(3) —NO₂

(4) —NH₂