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What is the chemical name and formula of...

What is the chemical name and formula of table salt?

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1) Formula of calcium hydroxide is Ca`(OH)_2`.
2) From criss-cross method we know that the valency of calcium is 2 i.e., `Ca^(+2)` and hydroxide is 1 i.e., OH.
3) Formula of zinc phosphate is `Zn_3(PO_4)_2`.
4) Valency of Zn is i.e, `Zn^(+2)` and valency of phosphate is 3 i.e, `PO_4^-3`
5) Now the formula of calcium phosphate according to criss-cross method is `Ca_3(PO_4)_2`.
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