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Name an element which is invariably biva...

Name an element which is invariably bivalent and whose oxide is soluble in excess of NaOH and its dipositive ion has a noble gas core.

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The elements which satisfies the following requirements:
(a). Invariably bivalent.
(b). Oxide is soluble in `NaOH`.
(c ) Dipostive ion has noble gas core is beryllium.
(i) The bivalent ion of beryllium is `Be^(2+)`.
(ii). Since `BeO` is amphoteric. It reacts both with an acid and an alkali, whereas other oxides of group `2` elements are basic and do not react with `NaOH`.
`BeO+2NaOHrarrNa_(2)BeO_(2)+H_(2)O`
(iii) `Be^(2+)` ion has noble gas core
`Be^(2+)`ion `1s^(2)2s^(0)` or `[He]2s^(0)`
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Knowledge Check

  • An inorganic compound (X) shows the following reactions : (a) It is white solid, exists as dimer and fumes in moist air. (b) It sublimes at 180^@ C and forms monomer on heating to 400^@ C . ( c) Its aqueous solution turns blue litmus red and gives a white precipitate with AgNO_(3) solution which is soluble in excess of NH_(4) OH . (d) Addition of NaOH to the solution of (A) gives a white gelatinous precipitate which is, however, soluble on excess of NaOH . Identify the compound (A) .

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