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JEE Main 20198 AprilMorning Shift

Exam: JEE Main
Year: 2019
Date: 8 April
Shift: Morning Shift
Subject: Chemistry
Chapter: p Block Elements (Group 13 & 14)

JEE Main 2019 · 8 April · Morning Shift · Chemistry · p Block Elements (Group 13 & 14)

Diborane ( B _ 2 H _ 6 ) reacts independently with O _ 2 and H _ 2...

Diborane

\left({B}_{2}{H}_{6}\right)

reacts independently with

{O}_{2} and {H}_{2}O

to produce, respectively:

Options

A $HB{O}_{2}$ and ${H}_{3}B{O}_{3}$
B ${H}_{3}B{O}_{3}$ and ${B}_{2}{O}_{3}$
C ${B}_{2}{O}_{3}$ and ${[ B{H}_{4} ]}^{-}$
D ${B}_{2}{O}_{3}$ and ${H}_{3}B{O}_{3}$

Correct answer

D. ${B}_{2}{O}_{3}$ and ${H}_{3}B{O}_{3}$

Step-by-step solution

Diborane reacts with oxygen exothermically to form boric oxide

( {B}_{2}{O}_{3} )

{B}_{2}{H}_{6} + 3{O}_{2} \to {B}_{2}{O}_{3} + 3{H}_{2}O

Diborane gets readily hydrolysed to give boric acid

{B}_{2}{H}_{6} + 3{H}_{2}O \to 2B{\left(OH\right)}_{3} + 3{H}_{2} ( g )

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