Question

Match the following compounds with their uses given:

Column 1	Column 2
Oxalic acid	Production of oxyacetylene flame
Ethanol	Manufacture of polymers
Butane	Component of fruit juices
Ethyne	Important component of LPG
Citric acid	Removing ink stains
Ethene	Thermometric liquid

Answer 1

(A) Oxalic acid - (V) Removing ink stains

The solvent used for removing ink stains from the clothes is oxalic acid, as it helps in converting the insoluble ions to soluble ions.

(B) Ethanol - (VI) Thermometric liquid

Thermometric liquids are generally used in cold regions. Ethanol has a low freezing point as compared to Mercury, so to avoid freezing they are used as thermometric liquids.

(C) Butane - (IV) Important components of LPG

LPG contains both Propane and Butane. Butane is used because it does not vaporize ( liquid to gas) in the colder region. So it is an important component of LPG.

(D) Ethyne - (I) Production of oxyacetylene flame

Combustion of Ethyne gas in the presence of air creates a high temperature of about ${3600}^{\circ }\mathrm{C}$ produces Carbon dioxide and water.

Such combustion produces an Oxyacetylene flame

The chemical reaction involved in such a process is as follows: $\underset{\left(\mathrm{Ethyne}\right)}{{\mathrm{C}}_2{\mathrm{H}}_2\left(\mathrm{g}\right)}+\frac{5}{2}{\mathrm{O}}_2\stackrel{{3600}^{\circ }\mathrm{C}}{\to }\underset{(\mathrm{Carbon}\mathrm{dioxide})}{2{\mathrm{CO}}_2\left(\mathrm{g}\right)}+{\mathrm{H}}_2\mathrm{O}\left(\mathrm{l}\right)$

(E) Citric acid - (III) Components of fruit juices

The highest concentration of Citric acid is found in fruits such as lemon, orange grapefruit, etc. The Citric juice helps in adding tart and tangy flavor to any of the substance.

(F) Ethene - (II) Manufacture of polymers

Basically, polymers are made up of Ethene. A large number of monomers are connected together to form a chain commonly known as Polyethene.

Hence, we get the following results:

Compounds	Use
(A) Oxalic acid	(V) Removing ink stains
(B) Ethanol	(VI) Thermometric liquid
(C) Butane	(IV) Important components of LPG
(D) Ethyne	(I) Production of oxyacetylene flame
(E) Citric acid	(III) Components of fruit juices
(F) Ethene	(II) Manufacture of polymers