Which among the following is the correct composition of Borax ?

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Sodium, Boron, Magnesium and Hydrogen

Sodium, Boron, Oxygen and Hydrogen

Potassium, Boron, Oxygen and Hydrogen

Sodium, Boron, Nitrogen and Hydrogen

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UPSC NDA-1 – 2024

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The correct composition of Borax includes Sodium, Boron, Oxygen, and Hydrogen.

Borax is commonly found as the mineral sodium tetraborate decahydrate, with the chemical formula Na₂B₄O₇·10H₂O. This formula clearly shows the presence of Sodium (Na), Boron (B), Oxygen (O), and Hydrogen (H).

The B₄O₇²⁻ anion in borax is actually a complex polyborate ion, often more accurately represented as [B₄O₅(OH)₄]²⁻ in its hydrated forms. The decahydrate contains 10 water molecules of crystallization.

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