$Mg$ (Magnesium) burns in $CO$ to produce

Number of moles of $KMnO_4$ required to oxidize one mole of $Fe(C_2O_4)$ in acidic medium is

How many electrons are involved in the following redox reaction?
$Cr_2O_7^{2-} + Fe^{2+} + C_2O_4^{2-} \to Cr^{3+} + Fe^{3+} + CO_2$ (Unbalanced)

In a weak alkaline medium,iodide is changed into which of the following compounds by $KMnO_4$?

Assign $A$,$B$,$C$,$D$ from the given type of reaction.
$Ca(OH)_2 + SO_2 \longrightarrow CaSO_3 \downarrow + H_2O$

$NaClO$ solution reacts with $H_2SO_3$ as,$NaClO + H_2SO_3 \to NaCl + H_2SO_4$. $A$ solution of $NaClO$ used in the above reaction contained $15 \ g$ of $NaClO$ per litre. The normality of the solution would be