Which of the following statement are incorrect?

Be dissolves in alkali forming

[B e (O H)_{4}]^{2 -}

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LiCI is soluble in pyridine

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Alkali metal ions have high hydration enthalpies owing to their small size

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B e F_{2}

forms a complex with NaF in which, beryllium acts as the cation

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Solution

The correct option is D $B e F_{2}$ forms a complex with NaF in which, beryllium acts as the cation

$B e F_{2} + 2 N a F \to N a_{2} [B e F_{4}]$

Beryllium lies in the coordination sphere, and sodium exists as the cation, outside the coordination sphere in this complex.

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Similar questions

Q. Assertion :Lithium salts are mostly hydrated. Reason: The hydration enthalpies of alkali metal ions decrease with increase in ionic sizes.

The solubility of metal halides depends on their nature, lattice enthalpy and hydration enthalpy of the individual ions. Amongst flurides of alkali metals, the lowest solubility of LiF in water is due to
(a) Ionic nature fo lithium fluoride
(b) high lattice enthalpy
(c) high hydration enthalpy for lithium ion
(d) low ionisation enthalpy of lithium atom

Q. The solubility of metal halides depends on their nature, lattice enthalpy and hydration enthalpy of the individual ions. Amongst fluorides of alkali metals, the lowest solubility of

L i F

in water is due to:

Name :

(a) a metallic hydroxide soluble in excess of $N H_{4} O H$ .
(b) a metallic oxide soluble in excess of caustic soda solution. (c) a strong alkali.
(d) a weak alkali.
(e) two colourless metal ions.
(f) two coloured metal ions.
(g) a metal that evolves a gas which burns with a pop sound when boiled with alkali solutions.
(h) two bases which are not alkalis but dissolve in strong alkalis. (i) a coloured metallic oxide which dissolves in alkalis to yield colourless solutions.
(j) a colourless cation, not a representative element.

Q. Name
(a) a metallic hydroxide soluble in excess of NH₄OH.
(b) a metallic oxide soluble in excess of caustic soda solution.
(c) a strong alkali
(d) a weak alkali
(e) two coloured metal ions.
(f) two bases which are not alkalis but dissolve in strong alkalis.
(g) a coloured metallic oxide which dissolves in alkalis to yield colourless solutions.

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Which of the following statement are incorrect?

The correct option is D BeF2 forms a complex with NaF in which, beryllium acts as the cation BeF2+2NaF→Na2[BeF4] Beryllium lies in the coordination sphere, and sodium exists as the cation, outside the coordination sphere in this complex.

The correct option is D $B e F_{2}$ forms a complex with NaF in which, beryllium acts as the cation

$B e F_{2} + 2 N a F \to N a_{2} [B e F_{4}]$

Beryllium lies in the coordination sphere, and sodium exists as the cation, outside the coordination sphere in this complex.