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Physical Change

Precipitation...

Question

Precipitation reaction involves reaction between

insoluble

M g C O_{3}

by adding

N a_{2} C O_{3}

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insoluble

M g (O H)_{2}

by adding

C a (O H)_{2}

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insoluble

M g S O_{4}

by adding

N a_{2} S O_{4}

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insoluble

M g C l_{2}

by adding NaCl

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Solution

The correct option is B insoluble $M g (O H)_{2}$ by adding $C a (O H)_{2}$
Principle behind this process is that $C a (O H)_{2}$ is soluble in water while $M g (O H)_{2}$ is sparingly soluble in water.

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How would you distinguish between Zn²⁺ and Pb²⁺ using ammonium hydroxide solution?

F e^{3 +} (a q) + S C N^{-} (a q) ⇌ F e S C N^{2 +} (a q)

N a O H (a q)

F e (O H)_{3}

F e^{3 +} (a q) + S C N^{-} (a q) ⇌ F e S C N^{2 -} (a q)

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