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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:
$$\begin{gathered} ZnO + 2NaOH \to N{a}_{2}Zn{O}_2 + H_{2}O \\ N{a}_{2}Zn{O}_2 is called as sodium zincate \end{gathered}$$
The answer to question number 23 is Aluminium as a protective layer o aluminium oxide is formed.

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