MCQ
In a period, elements are arranged in strict sequence of
- ADecreasing charges in the nucleus
- ✓Increasing charges in the nucleus
- CConstant charges in the nucleus
- DEqual charges in the nucleus
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$I :$ The three elements are metals.
$II :$ The electro negativities decrease from $X$ to $Y$ to $Z$.
$III :$ The atomic radius decreases in the order $X, Y$ and $Z.$
$IV : X, Y$ and $Z$ could be phosphorus, aluminium and sodium respectively.
Diazonium salts $\,+\,Cu_2Cl_2 \, + \, HCl \,\, \to$