Which of the following hydrides liberate H2 with water and give a solution that turns red litmus blue?

JEE Advanced levelOne or more correct optionsDifficulty 3 of 3sb038

Which of the following hydrides liberate $H X_{2}$ with water and give a solution that turns red litmus blue?

LiH

CaH X_{2}

and

SrH X_{2}

are ionic and hydrolyse as

MH + H X_{2} O MOH + H X_{2}

giving alkaline solutions.

B X_{2} H X_{6} + 6 H X_{2} O 2 H X_{3} BO X_{3} + 6 H X_{2}

also gives

H X_{2}

but the boric acid solution is weakly acidic, so it does not turn red litmus blue.