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

(1) lindane 

(2) TNT 

(3) malathion 

(4) methoxychlor 

Sulphaguanidine is used for:

(1) dysentery 

(2) urinary infections 

(3) antiseptic 

(4) antipyretic  

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 

Which of the following is a natural dye?

(1) Martius yellow 

(2) Alizarin 

(3) Phenolphthalein 

(4) Oragne l

Which of the following is a  dye?

(1) Methyl orange 

(2) Orange l

(3) Aniline yellow 

(4) All of these

A vat dye, often used in dyeing jeans is -

1. Indigo 

2. Alizarin 

3. Picric acid 

4. Crystal violet 

Which one is acidic dye?

(1) Methyl orange 

(2) Methyl red 

(3) Phenolphthalein 

(4) All of these 

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${}^{2+}$