CTET paper 2, Feb 2016 Q89

89A student burns a magnesium ribbon in air and dissolves the ash of the ribbon left after burning in distilled water. On pouring one drop each of this solution, first in blue litmus and then in red litmus solution, he would observe that

Option : D
Explanation : When magnesium ribbon is burnt in air, then it forms MgO. This MgO when dissolving in water forms Mg(OH)₂which is basic in nature (pH = 10.1). So, this solution turns red litmus into blue.

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