Question

20 (iv) A student dropped zinc discs in copper sulphate solution to carry out a
reaction. On weighing the discs and solution separately after some time, he found
that the mass of zinc discs had increased, but the mass of the solution had decreased.
Which of the following inferences is correct regarding the given experiment?
(a) Reaction between zinc discs and copper sulphate solution was incomplete.
(b) Atomic mass of zinc is greater than that of copper.
(c) There was an error in weighing the contents.
(d) Law of conservation of mass was obeyed.​

Answer 1

Answer:-

(b)Atomic mass of zinc is greater than that of copper.

Explanation:-

-- Atomic mass of Zinc : 65.4

-- Atomic mass of Copper : 63.5

Extra Info. :-

When a piece of granulated zinc was dropped into copper sulphate solution, the colour of the solution changes from blue to colourless as the following reaction takes place:

Zn+CuSO4  →ZnSO 4  +Cu

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