Is it true that the chemical formula of sodium phosphate is $N a_{3} P O_{3}$ ?

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True

False

answer is B.

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Detailed Solution

The above statement is false.
The oxidation state of Na is +1 and for phosphate

(P O_{4})

is -3. In the cris-cross method, oxidation state of cation is written in subscript of anion and vice versa irrespective of its charge. If we apply this for the given cation and anion, then the formula is

N a_{3} P O_{4}

.
The correct statement would be that the chemical formula of sodium phosphate is

N a_{3} P O_{3}

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