Question

the compound which is formed by thr combination of a polyatomic anion and a monoatomic cation (with 3 units positive charge) is 1. magnesium sulphate 2aluminium sulphate 3. aluminium sulphide 4.magnesium sulphide​

Answer 1

Answer:

In this article, we will discuss polyatomic ions. The prefix poly- means many, so a polyatomic ion is an ion that contains more than one atom. This differentiates polyatomic ions from monatomic ions, which contain only one atom. Examples of monatomic ions include \text{Na}^+Na

+

start text, N, a, end text, start superscript, plus, end superscript, \text{Fe}^{3+}Fe

3+

start text, F, e, end text, start superscript, 3, plus, end superscript, \text{Cl}^-Cl

−

start text, C, l, end text, start superscript, minus, end superscript, and many, many others. This article assumes you have a knowledge of basic monatomic ions as well as the conventions for naming ionic compounds and writing their chemical formulas.

Answer 2

The compound which is formed by thr combination of a polyatomic anion and a monoatomic cation (with 3 units positive charge) is aluminium sulphate. Option 2 is a correct answer.

The polyatomic anion sulphate ($SO_{4} ^{2-}$) and the monoatomic cation magnesium ($Mg^{2+}$), which has a 2+ charge rather than a 3+ charge, combine to create magnesium sulphate ($MgSO_{4}$).

The polyatomic anion sulphide ($S ^{2-}$) and the monoatomic cation magnesium ($Mg^{2+}$) combine to generate magnesium sulphide (MgS), however magnesium has a 2+ charge rather than a 3+ charge.

The polyatomic anion sulphide ($S ^{2-}$) and the monoatomic cation aluminium ($Al^{3+}$) combine to generate aluminium sulphide ($Al_{2} S_{3}$), which is not a sulphate compound.

The polyatomic anion sulphate ($SO_{4} ^{2-}$) and the monoatomic cation aluminium ($Al^{3+}$)  combine to generate aluminium sulphate ($Al_{2} (SO_{4} )_{3}$), which meets the requirement of possessing a monoatomic cation with a 3+ charge and a polyatomic anion.

Hence, The correct answer is 2. aluminum sulfate.

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