A certain dye was prepared from a plant grown on a large scale in India. Name the dye:

1. Malachite green

2. Congo red

3. Indigo

4. Turmeric

Which of the following structures represents a colourless substance?
 1.  $C_6{H}_5—N=N=C_6{H}_5$
$|$
$O$

(2) C₆H₅-N=N-C₆H₅

(3) C₆H₅-NH-NH-C₆H₅

(4) None of the above

Malachite green is a direct dye for silk and wool. It is prepared by condensing:

(1) Benzaldehyde and dimethyl aniline

(2) carbonyl chloride and dimethyl aniline

(3) benzene diazonium chloride with dimethyl aniline

(4) none of the above

The propellant in the proposed PSLV rocket of the Indian space programme shall consist of :

(1) a composite solid propellant

(2) liquid propellants such as N₂O₄ + unsymmetrical dimethyl hydrazine (UDMH) and N₂O₄ + monomethyl hydrazine (MMH)

(3) both (1) and (2) in different stages of rocket propulsion

(4) kerosene and liquid oxygen

The following compound is used as:

1. an anti-inflammatory compound

2. analgesic

3. hypnotic

4. antiseptic

The mixture of chloroxylenol and terpineol acts as-
(1) analgesic

(2) antiseptic

(3) antipyretic

(4) antibiotic

Which of the following is an analgesic?

1. Penicillin

2. Streptomycin

3. Chloromycetin

4. Novalgin

Bithional is generally added to the soaps as an additive to function as a/an

1. softener

2. dryer

3. buffering agent

4. antiseptic

The artificial sweetener that is stable under cold conditions only is: 

1. Saccharine                     

2. Sucralose

3. Aspartame                     

4. Alitame

The incorrect statement among the following is : 

1. A 0.2% solution of phenol is an antiseptic while 1 % solution acts as a disinfectant.

2. Chlorine and iodine are used as strong disinfectants.

3. Dilute solutions of boric acid and hydrogen peroxide, are strong antiseptics.

4. Disinfectants harm the living tissues.