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प्रश्न
Write the chemical formula of the following compound in a step-by-step manner –
Potassium dichromate
उत्तर
Write the formula of
| Potassium dichromate | Symbol | Valency |
| Potassium | \[\ce{K}\] | \[\ce{1^{+}}\] |
| dichromate | \[\ce{Cr2O7}\] | \[\ce{2^{-}}\] |
Step I – Write each symbol with its valency.
Positive ion is written first
\[\ce{K}^{1+}\] \[\ce{[Cr2O7]}^{2-}\]
Step II – Interchange the valencies and ignoring the (+) and (−) signs.
The Formula is \[\ce{K2Cr2O7}\]
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