Question

Match the substances in Column I with those in Column II.

Column 1	Column 2
Tartaric acid	Soap
Calcium hydroxide	Curd
Formic acid	Unripe mangoes
Sodium Hydroxide	Ant’s sting
Lactic acid	Lime water

Answer 1

(A)Tartaric Acid-(III)Unripe mangoes

• Tartaric acid (${\mathrm{C}}_4{\mathrm{H}}_6{\mathrm{O}}_6$) occurs naturally in many fruits like tamarind, citrus fruits, grapes, and unripe mangoes.

(B)Calcium hydroxide-(V) Lime water

• Calcium hydroxide ($\mathrm{Ca}{\left(\mathrm{OH}\right)}_2$) is also called lime water because it is obtained from lime $\left(\mathrm{CaO}\right)$ Calcium oxide.
• It is derived from Calcium Carbonate (${\mathrm{CaCO}}_3$) commonly known as limestone.

(C)Formic acid-(IV) ant's sting

• Nature has given ants formic acid or methanoic acid M to save them from their enemies which can cause irritation or itching and pain in humans.

(D)Sodium Hydroxide-(I) Soap

• Sodium Hydroxide $\left(\mathrm{NaOH}\right)$ is used in the process of making soaps in laboratories known as Saponification.

(E)Lactic acid-(II) Curd

• Lactic acid$\left({\mathrm{CH}}_3\mathrm{CHCOOH}\right)$ is a naturally occurring acid that can be synthesized in laboratories and also present in curd.

Therefore,

Column I	Column II
(A)Tartaric Acid	(III)Unripe mangoes
(B)Calcium hydroxide	(V) Lime water
(C)Formic acid	(IV) ant's sting
(D)Sodium Hydroxide	(I) Soap
(E)Lactic acid	(II) Curd