Find the number of aqueous solutions which turn blue litmus paper red:
(i) $Na_{2} CO_{3}$ (ii) $FeCl_{3}$ (iii) $KNO_{3}$ (iv) $NH_{4} NO_{3}$ (v) $KHSO_{4}$ (vi) $CH_{3} COOK$ (vii) $AlCl_{3}$

Question

Find the number of aqueous solutions which turn blue litmus paper red: (i) Na 2 ​ CO 3 ​ (ii) FeCl 3 ​ (iii) KNO 3 ​ (iv) NH 4 ​ NO 3 ​ (v) KHSO 4 ​ (vi) CH 3 ​ COOK (vii) AlCl 3 ​

TestHub · Accepted Answer

Acidic solutions turn blue litmus red.

(ii) $FeCl_{3}$ and (vii) $AlCl_{3}$ are salts of weak bases and strong acid (cation hydrolysis).

(iv) $NH_{4} NO_{3}$ is also a salt of a weak base and strong acid.

(v) $KHSO_{4}$ gives $H^{+}$ directly ( $HSO_{4}^{-}$ is a fairly strong acid).

(i) and (vi) are basic, and (iii) is neutral.

Answer: 4.

Chemistry - Ionic Equilibrium Question with Solution | TestHub

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