Browse by Stream
QnA
Home
QnA
Go To Your Study Dashboard

Get Answers to all your Questions

header-bg qa
  • Home
  • Engineering
  • When borax is heated with on a platinum loop, blue coloured bead formed is largely due to<div

When borax is heated with \mathrm{CoO} on a platinum loop, blue coloured bead formed is largely due to

Option: 1

\mathrm{B}_{2} \mathrm{O}_{3}


Option: 2

\mathrm{Co}\left(\mathrm{BO}_{2}\right)_{2}


Option: 3

\mathrm{CoB}_{4} \mathrm{O}_{7}


Option: 4

\mathrm{Co}\left[\mathrm{B}_{4} \mathrm{O}_{5}(\mathrm{OH})_{4}\right]


Answers (1)

best_answer

Borax bead test
\mathrm{Na}_{2} \mathrm{B}_{4} \mathrm{O}_{7} \overset{\Delta }{\rightarrow} 2\, \mathrm{NaBO}_{2}+\mathrm{B}_{2} \mathrm{O}_{3}
                                  Sodium
                                  metaborate

\mathrm{CoO+B_{2}O_{3}\overset{\Delta }{\rightarrow}Co\left ( BO_{2} \right )_{2}}
                                    Cobalt metoborate
                                      (blue)

Hence option (2) is correct.

Posted by

admin

View full answer

JEE Main high-scoring chapters and topics

Study 40% syllabus and score up to 100% marks in JEE

Similar Questions

Trending Articles/News

anam-khan

JEE Main Maths 2025: Five tips to score high marks in ‘toughest’ subject; most important chapters
anam-khan

JEE Main 2025 exam city intimation slip for session 1 soon at jeemain.nta.nic.in
anam-khan

Focus on modern physics, formulas to solve tricky problems; 5 tips to tackle JEE Main physics 2025

Latest Question