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Question
A strip of metal X is dipped in a blue coloured salt solution YSO4. After some time, a layer of metal Y from the salt solution is formed on the surface of metal strip X. Metal X is used in galvanisation whereas metal Y is used in making electric wires. Metal X and metal Y together form an alloy Z.
- What could metal X be?
- What could metal Y be?
- Name the metal salt YSO4.
- What type of chemical reaction takes place when metal X reacts with salt solution YSO4? Write the equation of the chemical reaction involved.
- Name the alloy Z.
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Solution
- Metal X is zinc (Zn). Zinc is widely used for galvanising iron to prevent it from rusting.
- Metal Y is copper (Cu). Copper is highly conductive and is the standard metal used for making electric wires.
- Metal salt YSO4 is Copper(II) Sulphate (CuSO4). This salt is known for its distinctive blue colour.
- A displacement reaction takes place. Because zinc is more reactive than copper, it displaces the copper from the copper sulphate solution, forming a layer of copper on the zinc strip.
\[\ce{Zn_{(s)} + CuSO4_{(aq)} -> ZnSO4_{(aq)} + Cu_{(s)}}\] - Brass
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