MCQ
The life span of atomic hydrogen is:
- AFraction of one sec.
- BNe year.
- COne hour.
- DOne day.
Explanation:
The life span of hydrogen is approximately 0.3 sec.
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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.
$Na _{2} O , As _{2} O _{3}, N _{2} O , NO$ and $Cl _{2} O _{7}$
Number of amphoteric oxides is ..... .