JEE Main 202329 JanuaryMorning Shift

Exam: JEE Main
Year: 2023
Date: 29 January
Shift: Morning Shift
Subject: Chemistry
Chapter: p Block Elements (Group 13 & 14)

JEE Main 2023 · 29 January · Morning Shift · Chemistry · p Block Elements (Group 13 & 14)

During the borax bead test with CuSO _ 4 , a blue green colour of...

During the borax bead test with

{CuSO}_{4}

, a blue green colour of the bead was observed in oxidising flame due to the formation of

Options

A ${Cu}_{3}{B}_{2}$
B $Cu$
CCu{ $\left({BO}_{2}\right)}_{2}$
D $CuO$

Correct answer

C. Cu{ $\left({BO}_{2}\right)}_{2}$

Step-by-step solution

Blue green colour is due to formation of $Cu{\left({BO}_{2}\right)}_{2}$ . Copper gives blue green colour in borax bead test. Reactions which lead to formation of borax bead:

${CuSO}_{4}\overset{\Delta}{⟶}CuO + {SO}_{3}$

$CuO + {B}_{2}{O}_{3} \to Cu{\left({BO}_{2}\right)}_{2}$

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