MCQ
The correct order of decreasing ionic nature of lead dihalides is
- ✓$Pb{F_2} > PbC{l_2} > PbB{r_2} > Pb{I_2}$
- B$Pb{F_2} > PbB{r_2} > PbC{l_2} > Pb{I_2}$
- C$Pb{F_2} < PbC{l_2} > PbB{r_2} < Pb{I_2}$
- D$Pb{I_2} < PbB{r_2} < PbC{l_2} < Pb{F_2}$
$PbF _2\,<\, PbCl _2\,>\, PbBr _2\,<\, PbI _2$
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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