When $MnO_2$ is fused with $KOH$,a coloured compound is formed. The product and its colour are:
- A$K_2MnO_4$,purple green
- B$KMnO_4$,purple
- C$Mn_2O_3$,brown
- D$Mn_3O_4$,black
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The most basic hydroxide among the following is
Chromite ore $\xrightarrow{Na_2CO_3 + O_2} A$ $\xrightarrow[NaOH]{H_2SO_4} B$. Which of the following is correct?
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View SolutionWhen dilute $H_2SO_4$ is added to an aqueous solution of potassium chromate,the yellow color of the solution turns to orange. What does this indicate?
$A$ metal $M$ which is not affected by strong acids like conc. $HNO_3$,conc. $H_2SO_4$ and conc. solutions of alkalies like $NaOH$,$KOH$ forms $MCl_3$,which finds use for toning in photography. The metal $M$ is:
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