1. name a reducing agent that can be used to obtain manganese from manganese dioxide. write balanced chemical equation for the reaction?
2. why should curd and sour substance not be kept in brass and copper vessels?
3. write balanced chemical equation when dil.HCl reacts with
a.magnesium ribbon
b. Iron filings
Answers
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1. It is done to prevent photolytic decomposition of hydrogen peroxide.
3 MnO2 + 4 Al ----> 2 Al2O3 + 3 Mn
Here, Reducing Agent is Aluminium (Al).
2. Curd and sour substance not be kept in brass and copper vessels to prevent the reaction between acid which is curd or sour substance and base which is copper or brass.
So, if they react together it will form salt and water which is neutralisation reactions.
3. (a) When HCl reacts with magnesium ribbon,
2HCl + 2Mg --------> 2MgCl + H2
(b) When HCl reacts with Iron filling,
4HCl + 2Fe ---------> 2Fe(Cl)2 + 2H2
3 MnO2 + 4 Al ----> 2 Al2O3 + 3 Mn
Here, Reducing Agent is Aluminium (Al).
2. Curd and sour substance not be kept in brass and copper vessels to prevent the reaction between acid which is curd or sour substance and base which is copper or brass.
So, if they react together it will form salt and water which is neutralisation reactions.
3. (a) When HCl reacts with magnesium ribbon,
2HCl + 2Mg --------> 2MgCl + H2
(b) When HCl reacts with Iron filling,
4HCl + 2Fe ---------> 2Fe(Cl)2 + 2H2
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