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Preparation of Sulphuric Acid by Contact process

The sulphur trioxide formed is first made to react with concentrated sulphuric acid. Sulphur trioxide cannot be dissolved in water directly as it leads to the formation of fog. The product obtained after this reaction is known as oleum. The oleum obtained is then dissolved in water to obtain concentrated sulphuric acid.

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Historical Context

The rubber head also plays a vital role in waterproofing. When these nails are installed, the rubber component creates a seal around the nail shank, preventing water infiltration. This characteristic is particularly important in roofing applications, where moisture can lead to severe structural damage over time.