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JEE Advanced levelSingle correct optionDifficulty 3 of 3pb045

$5.4 g$ of aluminium is dissolved in excess hot aqueous NaOH, giving sodium tetrahydroxoaluminate. Taking $Al = 27$ and molar volume $22.4 L/mol$ at STP, the volume of hydrogen evolved is

A $13.44 L$
B $3.36 L$
C $6.72 L$
D $4.48 L$

Answer: C

2 Al + 2 NaOH + 6 H X_{2} O 2 Na [Al (OH) X_{4}] + 3 H X_{2}

.

n (Al) = 5.4/27 = 0.20 mol

gives

0.20 \times 3/2 = 0.30 mol

H X_{2}

.

V = 0.30 \times 22.4 = 6.72 L

.

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