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Analytical Chemistry Uses of Ammonium Hydroxide and Sodium Hydroxide — Chemistry STD 10 — Question

ICSE BoardEnglish MediumSTD 10ChemistryAnalytical Chemistry Uses of Ammonium Hydroxide and Sodium Hydroxide1 Mark
MCQ
Ammonium hydroxide solution is added to Copper(II) sulphate solution in small quantities and then in excess.
  • ✓
    Tetraamine Copper Sulphate is formed at the product side.
  • B
    Reddish Brown Colour precipitate of Zinc hydroxide and NaCl is formed at the product side
  • C
    Zinc Oxide is formed at the product side.
  • D
    Light Brown crystals of Copper hydroxide is formed at the end of product side
✓

Answer

Correct option: A.
Tetraamine Copper Sulphate is formed at the product side.
(a) Tetraamine Copper Sulphate is formed at the product side.
Explanation :
When ammonium hydroxide $\left( NH _4 OH \right)$ solution is added to copper(II) sulphate ( $CuSO _4$ ) solution in small quantities, a light blue precipitate of copper hydroxide is formed. On adding excess of ammonium hydroxide solution, the precipitate thus formed dissolves and forms a complex ion called tetraammine copper sulphate, $\left[ Cu \left( NH _3\right)_4\right] SO _4$ which has a distinctive deep blue colour. The chemical reactions can be represented as follows :
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