Browse by Stream
QnA
Home
QnA
Go To Your Study Dashboard

Get Answers to all your Questions

header-bg qa
  • Home
  • Engineering
  • reacts with to give a white solid A which turns to a brow

\mathrm{MnCl_2} reacts with \mathrm{NaOH} to give a white solid A which turns to a brown solid B in presence of air. What is A and B?

Option: 1

\mathrm{Mn(OH)_2, MnO}


Option: 2

\mathrm{Mn(OH)_2, Mn_2O_3}


Option: 3

\mathrm{Mn_2O_3, MnO(OH)_2}


Option: 4

\mathrm{Mn(OH)_2, MnO(OH)_2}


Answers (1)

best_answer

On addition of \mathrm{NaOH} solution in excess, a white precipitate of manganese hydroxide is formed which turns brown due to atmospheric oxidation into hydrated manganese dioxide.

\mathrm{MnCl_2 + 2NaOH \rightarrow Mn(OH)_2 (White \: precipitate) + 2NaCl}

\mathrm{Mn(OH)_2 + [O] \rightarrow MnO(OH)_2 (Brown \: colour)}

Hence option 4 is correct.

 

Posted by

sudhir kumar

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 2026 application correction begins on jeemain.nta.nic.in; edit details by December 2
anam-khan

JEE Mains 2026 LIVE: NTA to conduct session 1 from January 21 to 30; exam pattern, syllabus
anam-khan

JEE Main 2026 correction window opens tomorrow; NTA allows exam city change

Latest Question