MCQ
The oxidation states of phosphorus vary from
- ✓$-3$ to $+5$
- B$-1$ to $+1$
- C$-3$ to $+3$
- D$-5$ to $+1$
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Reason : Transparent bead $(NaBO_2 + B_2O_3)$ forms coloured bead with coloured cation.

$C_2H_5OH_{(l)}+{3O_2} _{(g)} \rightarrow 2{CO_2} _{(g)}+3{H_2O}_{(l)}$
the amount of heat produced as measured in bomb calorimeter, is $1364.47\, kJ\, mol^{-1}$ at $25\,^oC.$ Assuming ideality the enthalpy of combustion, $\Delta_CH,$ for the reaction will be : $(R = 8.314\,kJ \,mol^{-1})$ .....$kJ\, mol^{-1}$