A sample of 4.2 g of copper (II) sulphate pentahydrate is dissolved and made up to 500 cm³. A 50 cm³ portion is added to an

Question

A sample of 4.2 g of copper (II) sulphate pentahydrate is dissolved and
made up to 500 cm³. A 50 cm³ portion is added to an excess of Kl. The
iodine formed required 18 cm³ of a 0.0950 mol dm-3 solution of sodium
thiosulphate for reduction.
Identify the correct statement(s)
(A) 1 Mole of Cu(II) consume 2 moles of Kl in the given procedure
(B) Percentage of Cu in the given sample is 26% (approximately)
(C) Mass of Cu in whole solution is 1.09 g (approximately)
(D) Reaction of Cu²+ with Kl result into the formation of metallic copper
and I

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