Which one is acidic dye?

(1) Methyl orange 

(2) Methyl red 

(3) Phenolphthalein 

(4) All of these 

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 of the followig is not a chromophore?

(1) $—$N=N$—$

(2) $—$NO

(3) $—$NO${}_2$

(4) $—$NH${}_2$

A vat dye, often used in dyeing jeans is -

1. Indigo 

2. Alizarin 

3. Picric acid 

4. Crystal violet 

Which one of the following is a vat dye?

(1) Alizarin 

(2) lndigo 

(3) Malachite green 

(4) Methyl orange 

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 

Which is correct about vanillin?

(1) A flavoring agent giving vanilla flavor 

(2) o-hydroxy-m-methoxy benzaldehyde 

(3) A food additive 

(4) All of the above

Which of the following is not a chlorinated insecticides?

(1) DDT

(2) Methoxychlor 

(3) Parathion

(4) BHC

Which of the following is not antipyretic?

(1) Aspirin 

(2) Paracetamol 

(3) Barbituric acid 

(4) Phenacetin