Multiple choice general knowledge science & technology

Calcium Oxide? (Ask the gardener)

  1. Clay

  2. Nitrate

  3. Chalk

  4. Lime
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Calcium oxide (CaO) is commonly known as 'quicklime' or simply 'lime' in gardening. Gardeners use it to raise soil pH. Clay is a soil type, nitrate is a nitrogen compound, and chalk is calcium carbonate (different from calcium oxide).

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