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Which statement is incorrect ? (1) Be ex...

Which statement is incorrect ? (1) Be exhibits coordination number six (2) Chlorides of both Be and Al have bridged structure in vapour phase (3)In alkali metals the reactivity increases but in halogens it decreases with increases in atomic number down the group (4) One mole of Mg3N2 when treated with excess of water give two moles of NH3

A

Be exhibits coordination number six

B

Chlorides of both Be annd Al have bridged structure in vapour phase

C

In alkali metals the reactivity increases but in halogens it decreases with increases in atomic number down the group

D

One mole of `Mg_(3)N_(2)` when treated with excess of water give two moles of `NH_(3)`

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