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What is a chemical displacement reaction...

What is a chemical displacement reaction ? Mention the condition required for it.

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The chemical reaction in which the more reactive element displaces the less reactive element from its compound is called chemical displacement reaction.
`X+YZtoXZ+Y`
X is more reactive element than y.
`Y+XZto` No reaction
Y cannot displace X from its compound since it is less reactive than X.
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