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Q.

100 mL of 0.06 M Ca(NO3)2 is added to 50 mL of 0.06 M Na2C2O4. After the reaction is complete.

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a

0.003 moles of calcium oxalate will get precipitated.

b

0.000003 M of excess Ca2+ will remain in excess.

c

Na2C2O4 is the limiting reagent

d

Ca(NO3)2 is the excess reagent

answer is A.

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Detailed Solution

CaNO32+Na2C2O4⟶CaC2O4↓+2NaNO3100×0.06 50×0.06                              ___=6mmol =3mmol 3mmol=0.003molNa2C2O4 is the limiting reagent.∴ 3 mmol Na2C2O4≡3 mmol Ca(NO3)2                      ≡3 mmol CaC2O4 ≡6 mmol NaNO3 mmol of Ca(NO3)2 left =6-3=3 mmol=0.003 mol MCa2+(left) = 3 mmol(100+50) mL=3150=0.02 M Hence, option (2) is wrong.
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