Red ink is prepared from:

(1) phenol 

(2) aniline 

(3) congo red 

(4) eosin 

A dizonium salt reacts with a phenol to give an azo dye. 

This reaction is known as:

(1) diazotisation 

(2) condensation 

(3) coupling 

(4) reduction 

Alizarin gives a red colour by mordanting it with the sulphate of a metal.

The metal ion involved is:

1. Cr${}^{3+}$

2. Fe${}^{3+}$

3. Al${}^{3+}$

4. Sn${}^{2+}$

Which one is acidic dye?

(1) Methyl orange 

(2) Methyl red 

(3) Phenolphthalein 

(4) All of these 

A vat dye, often used in dyeing jeans is -

1. Indigo 

2. Alizarin 

3. Picric acid 

4. Crystal violet 

Which of the following is a  dye?

(1) Methyl orange 

(2) Orange l

(3) Aniline yellow 

(4) All of these

Which of the following is a natural dye?

(1) Martius yellow 

(2) Alizarin 

(3) Phenolphthalein 

(4) Oragne l

The rose odour from an ester is formed by the action of HCOOH on:

(1) pine oil 

(2) olive oil 

(3) geraniol 

(4) turpentine oil 

Sulphaguanidine is used for:

(1) dysentery 

(2) urinary infections 

(3) antiseptic 

(4) antipyretic  

The insecticide containing 99% -isomer of benzene hexachloride is known as:

(1) lindane 

(2) TNT 

(3) malathion 

(4) methoxychlor