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Q. Name the following.pls answer the questions 18 to 25.(No irrelevant answers pls).

Dear Student
The answer to question number 21 is:
ZnO + 2NaOH   Na2ZnO2 + H2ONa2ZnO2 is called as sodium zincate
The answer to question number 23 is Aluminium as a protective layer o aluminium oxide is formed.

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19)manganese chloride
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