Question

Some naturally occurring acids are given below with their sources.

Identify the incorrect pair:

a. vinegar - Acetic acid                               

b. Oranges - Citric acid

c. Tamarind - Tartaric acid                         

d. Tomatoes - Oxalic acid

e. Sour milk (curds) - Lactic acid               

f. Lemons - Citric acids

g. Ant sting - Methanoic acid                   

h. Nettle sting - Sulphuric acid

1. c
2. d
3. g
4. h

Answer 1

Correct Answer - Option 4 : h

The correct answer is h.

• Nettles are covered with tiny hollow hair. These cause intense pain when touched.
• Stinging happens because of presence of-
  • Formic acid
  • Histamine
  • Oxalic acid
• The pain caused by nettle sting can be reduced by antihistamines which neutralizes the effect of histamine present in the nettle and caused inflammation and pain.

 

• Sulfuric acid (H₂SO₄) is also called oil of vitriol, or hydrogen sulfate.
  • It is viscous, colorless and corrosive liquid.
  • It has high affinity for water.
  • Its pH is 1.87 - highly acidic.
• Properties of acids-
  • They are sour in taste and are soluble in water.
  • They have corrosive action.
  • Aqueous solution of acid conduct electricity.
  • It turns blue litmus red.
  • Acid react with metals to release Hydrogen gas.
  • Acids react with bases and produces salt.