presbyopia
30. Lime water reacts with chlorine to give
(a) bleaching powder
(b) baking powder
(d) washing soda
(c) baking soda
Answers
Explanation:
Pure lime, or quicklime, is calcium oxide. Its ease of manufacture and chemical properties make it an important industrial chemical.
Lime has a long history dating from the earliest of times. Its main uses were as an ingredient in mortar and as a soil fertiliser.
Lime manufacture
From the earliest of times, lime has been made by heating limestone to high temperatures. Production methods have evolved from heating limestone in open fires, to the use of brick lime kilns at the start of the 17th century, to today’s horizontal rotating kilns several metres in diameter and up to 100 metres in length. These modern kilns operate at a temperature of about 1100-1200°C, allowing rapid conversion of limestone into lime.
CaCO3(s) limestone → CaO(s) lime + CO2(g) carbon dioxide
Answer:
a) bleaching powder
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