Valency of Mg in magnesium sulphate is

Explanation

To determine the valency of magnesium (Mg) in magnesium sulfate (MgSO₄), follow these steps:

### Step 1: Understand the Composition of Magnesium Sulfate
Magnesium sulfate is composed of magnesium ions (Mg²⁺) and sulfate ions (SO₄²⁻). The chemical formula for magnesium sulfate is MgSO₄.

**Hint:** Remember that the formula indicates the ratio of the elements involved in the compound.

### Step 2: Identify the Charge of the Sulfate Ion
The sulfate ion (SO₄) has a charge of -2. This means that it carries a negative charge of 2.

**Hint:** Look up common polyatomic ions to find their charges.

### Step 3: Determine the Overall Charge of Magnesium Sulfate
The overall compound, magnesium sulfate, is electrically neutral. This means that the total positive charge must equal the total negative charge.

**Hint:** The neutrality of the compound is key to finding the valency of magnesium.

### Step 4: Calculate the Required Charge on Magnesium
Since the sulfate ion has a charge of -2, to balance this and achieve neutrality, the magnesium ion must have a charge of +2.

**Hint:** Think about how charges balance out in ionic compounds.

### Step 5: Conclude the Valency of Magnesium
The valency of magnesium in magnesium sulfate is +2. This indicates that magnesium can combine with two negative charges from the sulfate ion.

**Hint:** Valency can often be inferred from the charges of the ions involved in the compound.

### Final Answer
The valency of magnesium (Mg) in magnesium sulfate (MgSO₄) is +2.

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