1. why precipitate is formed during a double displacement reaction?
2. what are the advantages of corrosion?

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Solution

1. Double displacement reaction occur in aqueous solution, and the combination of cation and anion occur forming a compound which is insoluble in water. That is why always precipitation reaction occur.
For ex.,
BaCl₂ + Na₂SO₄ ------- BaSO₄ + 2 NaCl

2. Advantages of corrosion
cSometimes when metal is exposed to moisture it forms an oxide layer which protects the metal from being further corroded by corrosion. This process is called anodizing. Ex., Sacrificial anode as zinc which protects the underlying copper or iron.
Disadvantages:
The metal slowly starts corroded and its strength decreases
The lustrous appearance of the metal will be lost.

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(a) When you have mixed the solutions of lead(II) nitrate and potassium iodide,
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1. why precipitate is formed during a double displacement reaction? 2. what are the advantages of corrosion?

1. why precipitate is formed during a double displacement reaction?
2. what are the advantages of corrosion?