MolSynapsequestion bank

MolSynapse / Question bank / p-Block Elements: Groups 13 and 14 / Boron compounds: diborane, boric acid, borax, boron halides

JEE Main levelNumerical answerDifficulty 2 of 3pb033

Diborane hydrolyses completely according to $B X_{2} H X_{6} + 6 H X_{2} O 2 H X_{3} BO X_{3} + 6 H X_{2}$ . Calculate the volume of hydrogen, in litres at STP, produced from $8.4 g$ of $B X_{2} H X_{6}$ . Take $B = 11$ , $H = 1$ and molar volume $= 22.4 L/mol$ . Give the answer to two decimal places.

Numerical answer type, answer in L, tolerance 0.01.

Answer: 40.32 L

Molar mass of

B X_{2} H X_{6} = 2 (11) + 6 (1) = 28 g/mol

, so

n = 8.4/28 = 0.30 mol

. The equation gives 6 mol

H X_{2}

per mol

B X_{2} H X_{6}

, so

n (H X_{2}) = 1.80 mol

.

V = 1.80 \times 22.4 = 40.32 L

.

Practice p-Block Elements: Groups 13 and 14 More on Boron compounds: diborane, boric acid, borax, boron halides

Previous questionNext question

More questions on Boron compounds: diborane, boric acid, borax, boron halides

Hydrolysis of BF3 with water, after the HF formed has reacted with unreacted BF3, finally gives JEE Main level
Select the correct statement(s) about diborane, B2H6. JEE Main level
Select the correct statement(s) about borax. JEE Main level
The anion of borax is [B4O5(OH)4]^2-. The sum of the number of sp^3 hybridised boron atoms and the number of terminal hydroxyl groups in thi... JEE Advanced level
On gradual heating, orthoboric acid passes through which sequence of products? JEE Advanced level
Diborane reacts with ammonia on heating to give borazine, B3N3H6 (a planar six-membered ring), with release of hydrogen: 3B2H6 + 6NH3 -> 2B3... JEE Advanced level