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Which of the following options shows the correct arrangement of different substances with increasing pH values?

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Potassium hydroxide, calcium hydroxide, acetic acid and hydrochloric acid

Sulphuric acid, lactic acid, sodium hydroxide and ammonium hydroxide

Hydrochloric acid, lactic acid, ammonium hydroxide and potassium hydroxide

Ammonium hydroxide, magnesium hydroxide, lactic acid and sulphuric acid

answer is C.

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Detailed Solution

Hydrochloric acid, pH value 3.01.

Lactic acid pH value 3.5

Ammonium hydroxide pH value 10.09

Potassium hydroxide pH value 12.88

Hence the correct increasing order is-

Strong Acid < Weak Acid < Weak Base < Strong Base

Hydrochloric acid, lactic acid, ammonium hydroxide and potassium hydroxide.

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