Four groups of students were assigned separately the experiment of interaction of iron nails with a solution of copper sulphate.
Four groups of students were assigned separately the experiment of interaction of iron nails with a solution of copper sulphate. Each group recorded the observations as given b elow in the table.
| Group of
students |
Initial
colour of solution |
Final
colour of solution |
Changes in
the iron nail |
| A | Blue | Colourless | Grey coat |
| B | Green | Green | Brown coat |
| C | Blue | Blue | Brown coat |
| D | Blue | Light
green |
Brown coat |
Which group of students recorded all the observations correctly?
(A) A (B) B (C) C (D) D
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