A) It turns blue litmus red and phenolphthalein pink, hence it is an acidic solution.
B) It turns red litmus blue and phenolphthalein pink, hence it is a basic solution.
C) It turns blue litmus red and gives no colour with phenolphthalein, hence it is an acidic solution.
D) It does not change colour of red or blue litmus and phenolphthalein, hence it is a neutral solution.
Correct Answer: B
Solution :
\[\underset{Magnesium}{\mathop{Mg}}\,+\underset{Oxygen}{\mathop{{{O}_{2}}}}\,\to \underset{\begin{smallmatrix} Magnesium \\ oxide\,(ash) \end{smallmatrix}}{\mathop{MgO}}\,\] \[\underset{\begin{smallmatrix} Magnesium \\ oxide \end{smallmatrix}}{\mathop{MgO}}\,+\underset{Water}{\mathop{{{H}_{2}}O}}\,\to \underset{\begin{smallmatrix} Magnesium \\ hydroxide \\ (X) \end{smallmatrix}}{\mathop{Mg{{(OH)}_{2}}}}\,\] \[Mg{{(OH)}_{2}}\] solution is basic in nature which turns red litmus blue and phenolphthalein pink.
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