What is the colour of methyl red in the solution of (i) pH = 4 (ii) pH = 9.
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(a) Acids are : HCl and lemon juice because the pH is less than 7.
(b) Alkaline or basic solution turns phenolphthalein pink.
(c) Neutral solutions : Distilled water and NaCl.
(d) HCl is the strongest acid and NaOH is the strongest base.
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