Question

lime water reacts with chlorine to form
a)cacl2
b)caocl2
c)ca(clo3)2
d)cao2cl2​

Answer 1

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

CaO(s)

lime

+

H2O(l)

water

→

Ca(OH)2(s)

slaked lime

Ca(OH)2(s)

slaked lime

+

H2O(l)

water

→

Ca(OH)2(aq)

limewater

Ca(OH)2(aq)

limewater

+

CO2(g)

carbon dioxide

→

CaCO3(s)

calcium carbonate

+

H2O(l)

water

Lime reacts with acidic gases like sulfur dioxide.

CaO(s)

lime

+

SO2(g)

sulfur dioxide

→

CaSO3(s)

calcium sulfite

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option C

Answer 2

Lime water reacts with chlorine to form $CaOCl_{2}$. (Option b)

• Calcium hydroxide $Ca(OH)_{2}$ is a base and when it reacts with another compound it releases $OH^{-}$ ions. It is soluble in acids but only slightly soluble in water. When it is dissolved in water to a saturation point, it produces lime water.
• Lime water reacts with acids and forms salts. At the same time, when it reacts with chlorine, it forms $CaOCl_{2}$ which is also known as bleaching powder.
• The reaction of lime water and chlorine is as follows -
  $Ca(OH)_{2} +Cl_{2}$ → $CaOCl_{2} +H_{2}O$

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