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Zinc Ion

The hydroxide...

Question

The hydroxide which is soluble in excess of $N a O H$ is :

A

Z n (O H)_{2}

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B

F e (O H)_{3}

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C

F e (O H)_{2}

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D

None of these

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Solution

The correct option is A $Z n (O H)_{2}$

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Identify the hydroxide which is soluble in excess of NaOH

Q. Fill in the blanks:
(a) Salts of ________ [normal / transition] elements are generally coloured. From the ions K¹⁺, Cr³⁺, Fe²⁺, Ca²⁺, SO₃²⁻, MnO₄¹⁻, NO₃¹⁻ the ions generally coloured are _________ .
(b) The hydroxide which is soluble in excess of NaOH is ________ [Zn(OH)₂ / Fe(OH)₃ / Fe(OH)₂].
(c) The salt which will not react with NH₄OH solution ________ [ZnCl₂ / CuCl₂ / NH₄Cl / FeCl₂].
(d) The substance/ s which react/ s with hot conc. NaOH solution and undergoes a neutralization reaction ________ [Al₂O₃ / Al / Al(OH)₃].
(e) To distinguish soluble salts of zinc and lead _________ [NaOH / NH₄OH] can be used.

Assertion: The solubility product of hydroxide of

F e^{2 +}

is higher than that of

F e^{3 +}

Reason: The lattice energy of

F e (O H)_{2}

is lower than that of

F e (O H)_{3}

.

Q. Which one of the following metallic hydroxides does not dissolve in sodium hydroxide solution?

Z n (O H)_{2}

F e (O H)_{3}

Q. Aluminium hydroxide is soluble in excess of

N a O H

forming the ion :

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