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Question

Which of the following equation is not correct?


A
Amphoteric oxide / Hydroxide + Acid Salt + Water
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B
Amphoteric oxide / Hydroxide + Alkali Salt + Water
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C
Metal + Alkali Salt + Water
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D
Metal + Alkali Salt + Hydrogen
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Solution

The correct option is C Metal + Alkali$$\rightarrow$$ Salt + Water
  • Amphoteric oxide / Hydroxide on reaction with an acid forms a salt and water. 
Example- ZnO + 2HCl → ZnCl₂ + H₂O. 
Hence, option A represents the correct equation.
  • Amphoteric oxide / Hydroxide on reaction with an Alkali forms a salt and water. 
Example- BeO + 2NaOH → Na₂BeO₂ + H₂O. 
Hence, option B also represents the correct equation.
  • When a metal reacts with an alkali, salt and hydrogen gas is formed. 
Example- Zn + 2NaOH → Na₂ZnO₂ + H₂ .

Hence, option C represents the incorrect equation and option D is the correct equation.

Chemistry

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