Correct option is A
Solution
Concept:
Acid and Base
| Acid |
Base |
| Acids are sour in taste. |
Bases are bitter in taste and have a soapy feel. |
| Acids are present in sour fruits, vinegar, toilet cleaner, etc. |
Bases are present in neem, clove, soaps, etc. |
| Acids turn blue litmus paper to red. |
Bases turn litmus paper from red to blue. |
| Acids have a higher concentration of H + ions in its aqueous solution. |
Bases have a higher concentration of OH - ions in their aqueous solution. |
· Strong and weak acid
· Strong acids have a very high concentration of H + ions. Sulphuric acid, hydrochloric acid, Nitric acid are some examples of strong acids.
· Weak acids have comparatively low concentrations of H + ions. Citric acid, tartaric acid, acetic acid are some examples of strong bases.
So, citric acid is a weak acid.
Important Points Strongness of an acid or base is determined by its pH value.
pH = - log [H +]
It is measured from a scale of 0 - 14
Strong acids have pH : 0 - 3
Weak acids have pH: 3 - 6
Neutral solutions have pH = 7
Weak bases have pH: 8 - 11
Strong bases have pH 11 - 14
English
150 Questions
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