MCQ
Which of the following is the most electropositive element
- AAluminium
- ✓Magnesium
- CPhosphorus
- DSulphur
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$(I)$ $Be$ has smaller atomic radius compared to $Mg$
$(II)$ $Be$ has higher ionization enthalpy than $Al.$
$(III)$ Charge/radius ratio of $Be$ is greater than that of $Al$.
$(IV)$ Both Be and $Al$ form mainly covalent compounds.
[Given : Molal elevation constant of water $K _{ b }=0.5\, \,K\, kg\, mol ^{-1}$ boiling point of pure water $\left.=100^{\circ} C \right]$