Which type of salt have pH less than 7 ?

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Salt of strong acid and strong base.

Salt of strong acid and weak base.

Salt of weak acid and strong base.

Salt of the weak acid and weak base.

answer is B.

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Detailed Solution

When an acid and base react, they neutralize each other to form salt and water.

$Acid + Base \to Salt + Water$

The salt produced can further be classified as acidic salt, basic salt, and neutral salt.

When a strong acid reacts with a strong base, the salt produced is neutral in nature with pH = 7.

When a strong acid reacts with a weak base, the salt produced is acidic in nature with pH <7.

When a weak acid reacts with a strong base, the salt produced is basic in nature with pH > 7.

Hence, the correct option is (B).

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