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Q.

When a gas ‘X’ is passed through a solution ‘Y’ formed a white precipitate in the test tube.  Student continued to pass gas ‘X’ and observed that the precipitate formed is disappeared by forming Z gas X is a main component in photosynthesis reaction.  Identity the correct statement.

(i) Y is lime water       (ii) Z is calcium bicarbonate

(iii) Gas ‘X’ is CO2      (iv) X is H2    

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a

(ii), (iii)

b

(i), (ii)

c

(i), (ii), (iii)

d

(i), (ii), (iv)

answer is D.

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Detailed Solution

X+Y(lime)whiteppt

X+Y(excess)whitepptdisappeared(Z)

Y=Ca(OH)2(aq);X=CO2(g)Z=Ca(HCO3)2(aq)

Ca(OH)2(aq)+CO2(g)(limit)CaCO3(s)(Whiteppt)+H2O(l)

Ca(OH)2(aq)+CO2(g)(excess)Ca(HCO3)2(aq)(NO ppt)

CaCO3  is insoluble ppt while Ca(HCO3)2  is soluble in water and produce temporary Hardness.

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