MCQ
Oxidation number of nitrogen in $NaN{O_2}$ is
- A$+2$
- ✓$+3$
- C$+4$
- D$-3$
$ + 1 + x + ( - 2) \times 2 = 0$
$1 + x - 4 = 0$; $x = + 3$
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$C ( s )+\frac{1}{2} O _{2}( g ) \rightarrow CO ( g )+100 \;kJ$
When coal of purity $60 \%$ is allowed to burn in presence of insufficient oxygen, $60 \%$ of carbon is converted into $'CO'$ and the remaining is converted into $'CO _{2}$$'$.
The heat generated when $0.6 \;kg$ of coal is burnt is
[At. nos. $Zn = 30, Sc = 21, $$Ti = 22, Cr = 24$]