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Atoms and Molecules — Science STD 9 — Question

Gujarat BoardEnglish MediumSTD 9ScienceAtoms and Molecules1 Mark
Question
Write the chemical formula using criss-cross method:
Ammonium sulphate.
✓

Answer

Ammonium sulphate $\left(\mathrm{NH}_4\right)_2+\left(\mathrm{SO}_4\right)_1$
Cross multiply $\left(\mathrm{NH}_4\right)_1\left(\mathrm{SO}_4\right)_2=\left(\mathrm{NH}_4\right)_2 \mathrm{SO}_4$

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