In the reaction Al(OH)3 + 2HCl -> Al(OH)Cl2 + 2H2O, the equivalent mass of Al(OH)3 (molar mass 78 g mol^-1) is:

JEE Main levelSingle correct optionDifficulty 2 of 3eq006

In the reaction $Al (OH) X_{3} + 2 HCl Al (OH) Cl X_{2} + 2 H X_{2} O$ , the equivalent mass of $Al (OH) X_{3}$ (molar mass $78 g mo l^{- 1}$ ) is:

Only two of the three

OH X^{-}

groups are replaced, so the n-factor is

2

(not

3

). Equivalent mass

= 78/2 = 39

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