Which of the following represents a correct chemical formula?

Question:

Which of the following represents a correct chemical formula? Name it.

(a) $\mathrm{CaCl}$

(b) $\mathrm{BiPO}_{4}$

(c) $\mathrm{NaSO}_{4}$

(d) NaS.

Solution:

(b). Both Bi and $\mathrm{PO}_{4}$ are trivalent ion $\left(\mathrm{Bi}^{3+}\right.$ and $\left.\mathrm{PO}_{4}{ }^{3-}\right)$.

It is known as bismuth phosphate.

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