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

Which of the following groups is not an auxochrome ?

(1)-N(CH₃)₂

(2)-OH

(3)-OCH₃

(4) $>\mathrm{C}=\mathrm{N}$

The compounds used to fix a dye to fabric is known as:

(1) mordant                     

(2) azeotrope

(3) bleaching agents         

(4) lake

Which one is disperse dye?

(1) Congo red

(2) Alizarin

(3) Celliton

(4) None of these

Red ink is prepared from :

(1) Phenol

(2) Aniline

(3) Congo red

(4) Eosin

Alizarin a mordant dye is not used in:

(1) cotton dyeing

(2) printing

(3) painting

(4) Chromium lakes for wood dyeing 

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