If 10 mL of H2SO4 is mixed with 10 mL of Mg(OH)2 of the same concentration, the resultant solution will give the following colour with universal indicator :
(A) Red (B) Yellow
(C) Green (D) Blue
Correct Answer: (C) Green
Explanation: If 10 mL of H2SO4 is mixed with 10 mL of Mg(OH)2 of the same concentration, the resultant solution will give pH of 7 as it is a strong acid- strong base titration. The given equation is $H_2SO_4 + Mg(OH)_2 \rightarrow MgSO_4 + 2 H_2O$.
As we know, pH 7 gives green color in the universal indicator, hence, (c) is the correct option.
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