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Atoms and Molecules — Science STD 9 — Question

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

Ammonium sulphate $(NH_4)_2 + (SO_4)_1$
Cross multiply $(NH_4)_1 (SO_4)_2 = (NH_4)_2SO_4$​​​​​​​

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