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Iron(II) oxalate (FeC2O4) is heated in the absence of air and decomposes to give a residue plus two gases. Gas A is absorbed by ethanolamine. Which of the following statements are correct? (A) The residue is black in colour. (B) The atomicity of Gas A is 3. (C) Gas B is absorbed by aqueous suspension of CuCl. (D) Gas B can turn baryta water milky.
- (A) Residue is black in colour
- (B) Atomicity of gas A is 3
- (C) Gas B is absorbed by aqueous suspension of CuCl
- (D) Gas B can turn baryta water milky
Correct answer: (A) Residue is black in colour
Solution
Thermal decomposition: FeC2O4 -> FeO + CO + CO2. Ethanolamine absorbs CO2 (acidic), so Gas A = CO2, Gas B = CO. (A) FeO is black - TRUE. (B) CO2 has 3 atoms per molecule (atomicity = 3) - TRUE. (C) Aqueous CuCl (cuprous chloride, Winkler's reagent) absorbs CO - TRUE. (D) Baryta water = Ba(OH)2 solution. CO2 makes it milky (BaCO3), but Gas B = CO which does NOT turn baryta water milky - FALSE. Correct statements: A, B, C.
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