题目内容
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[主观题]
Boil 0.5 g of thepowdered tablets for 2 to 3 minutes with 10 mL of 5 M sodium hydroxid
e, cooland add an excess of 1 M sulfuric acid; a crystalline precipitate is produced.To a solution of the precipitate in water add iron (III) chloride solution R1;a _______ colour is produced.
A、turquoiseblue
B、deep violet
C、sandy brown
D、smoky grey
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