Excess sulphate in water causes blue baby syndrome.

Explanation

**Step-by-Step Solution:**

1. **Understanding the Question**: The question states that excess sulphate in water causes blue baby syndrome. We need to analyze if this statement is true or false.

2. **Identifying the Actual Cause**: Blue baby syndrome is primarily caused by the presence of high levels of nitrates in drinking water, not sulphates.

3. **Mechanism of Blue Baby Syndrome**: When infants consume formula made with nitrate-contaminated water, their bodies convert nitrates into nitrites.

4. **Impact on Hemoglobin**: The nitrites then bind to hemoglobin in the blood, forming methemoglobin. This form of hemoglobin is unable to effectively carry oxygen, leading to a condition where the baby appears blue due to lack of oxygen (cyanosis).

5. **Conclusion**: Therefore, the statement that excess sulphate in water causes blue baby syndrome is false. The correct cause is excess nitrate in water.

**Final Answer**: The statement is false; blue baby syndrome is caused by excess nitrates in water, not sulphates.

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