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Q.

A solution reacts with crushed eggshells to give a solution that turns lime-water milky. The solution contains:


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a

NaCl  

b

HCl  

c

LiCl  

d

KCl   

answer is B.

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Detailed Solution

concept - Lime water is actually a calcium hydroxide solution( Ca(OH) 2  ) and it turns milky on passing carbon dioxide.
Egg-shell is composed of calcium carbonate ( CaCO 3  ), and these egg-shells react with hydrochloric acid ( HCl  ) to produce calcium chloride ( CaCl 2  ), water and carbon dioxide ( CO 2  ). The produced carbon dioxide on passing through lime water ( Ca(OH) 2  ) turns the solution milky by forming calcium carbonate. The reaction is shown as
<math xmlns="http://www.w3.org/1998/Math/MathML"><msub><mi>CaCO</mi><mn>3</mn></msub><mo>&#xA0;</mo><mo>+</mo><mo>&#xA0;</mo><mn>2</mn><mi>HCl</mi><mo>&#xA0;</mo><mo>&#x2192;</mo><mo>&#xA0;</mo><msub><mi>CaCl</mi><mn>2</mn></msub><mo>&#xA0;</mo><mo>+</mo><mo>&#xA0;</mo><msub><mi mathvariant="normal">H</mi><mn>2</mn></msub><mi mathvariant="normal">O</mi><mo>&#xA0;</mo><mo>+</mo><mo>&#xA0;</mo><msub><mi>CO</mi><mn>2</mn></msub></math>Therefore, the solution that reacts with crushed eggshells to give a solution that turns lime-water milky is hydrochloric acid ( HCl  )
Hence, the correct answer is 2.
 
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