- Home
- Standard 11
- Chemistry
p-Block Elements - I
medium
The green colour produced in the borax bead test of a chromium$(III)$ salt is due to formation of______:
A
$Cr \left( BO _2\right)_3$
B
$CrB$
C
$Cr _2\left( B _4 O _7\right)_3$
D
$Cr _2 O _3$
(IIT-2019)
Solution
Chromium $(III) salt \xrightarrow{\Delta} Cr _2 O _3$
Borax $\xrightarrow{\Delta} B _2 O _3+ NaBO _2$
$2 Cr _2 O _3+6 B _2 O _3 \longrightarrow 4 Cr \left( BO _2\right)_3$
So correct answer is option$(1)$
Standard 11
Chemistry
