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Question

A solution reacts with crushed egg-shells to give a gas that turns lime-water milky. The solution contains


A

NaCl

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B

HCl

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C

LiCl

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D

KCl

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Solution

The correct option is B

HCl


Explanation for the correct answer:-

Option (B) HCl

  • The egg shell is made up of Calcium carbonate(CaCO3).
  • Therefore, when it reacts with Hydrochloric acid, it forms Calcium chloride, water, and Carbon dioxide.
  • The complete reaction is:

CaCO3(s)Calciumcarbonate+HCl(aq)HydrochloricacidCaCl2(aq)Calciumchloride+H2O(l)Water+CO2(g)()Carbondioxide

  • The gas involved here is Carbon dioxide.
  • This Carbon dioxide when reacted with Calcium hydroxide(CaOH2)which is also called lime water, forms a milky solution of Calcium carbonate.
  • This Calcium carbonate formed here is a white ppt, and along with it, water is also formed as a by-product.
  • The complete reaction is:

Ca(OH)2(aq)Calciumhydroxide(Limewater)+CO2(g)CarbondioxideCaCO3(s)()(white)Calciumcarbonate+H2O(l)Water

  • Hence it is the correct option.

Therefore, option (B) HCl is the correct answer.


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