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Select the correct statementsA. Passage of sulphur dioxide or of hydrogen sulphide (not in excess ) in to a solution of an iodate acidified with dilute hydrochloric acid, liberates iodineB. Phosphate rock, `Ca_3(PO_4)_2` on heating with sand coke in electric furnace at `1400-1500^@C` yields dimeric phosphorus pentaoxideC. Reaction of `H_2S` on aqueous solution of sodium sulphide yields sodium thiosulphateD. Sodium hypophosphite on warming with copper sulphate solution gives red precipitate of copper(I) |
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Answer» Correct Answer - A,C,D (A)`2IO_3^(-)+5H_2SO_3 to I_2 +5SO_4^(2-) + OH^(+)+H_2O , 2IO_3^(-) + 5H_2S + 2H^(+) to I_2 + 5S + 6H_2O` (B)`2Ca_3(PO_4)_2 +6SiO_2 + 10 C overset(1400-1500^@C)to 6CaSiO_3 + 10CO +P_4` (C )`2HS^(-)+4HSO_3^(-)to3S_2O_3^(2-)+3H_2O` (D)`3H_2PO_2^(-) + 4Cu^(2+)+ 6H_2O to 4CuH darr ("red")+3H_3PO_4 + 5H^+` |
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