When items of jewellery made of base metals like copper, iron or nickel are placed in a solution containing a compound of gold, a film of gold is deposited by:

cooling to

5

degree centigrade

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adding acid

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heating

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passing an electric current

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Solution

The correct option is D passing an electric current
Electroplating is the process in which a layer of a metal is deposited on metallic or non-metallic electrode by electrolysis in an electrolytic cell.
When items of jewellery made of base metals like copper, iron or nickel are placed in a solution containing a compound of gold, a film of gold is deposited by the process of electroplating which requires passing an electric current in it.
Hence option D gives the correct answer.

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Similar questions

Q. Assertion :Gold chloride

(A u C l_{3})

solution cannot be stored in a vessel made of copper, iron, nickel, chromium, zinc or tin. Reason: Gold is very precious metal.

Q. In an electrolysis experiment, a current was passed for

5

hours through two cells connected in series. The first cell contains a solution of gold salt and the second cell contains copper sulphate solution

9.85 g

of gold was deposited in the first cell. If the oxidation number of gold is

+ 3

, find the amount of copper deposited on the cathode in the second cell. Also calculate the magnitude of the current in ampere.

Q. In an electrolysis experiment, a current was passed for 5 hours through two cells connected in series. The first cell contains a solution of gold salt and the second cell contains copper sulphate solution.

9.85 g

of gold was deposited in the first cell. If the oxidation number of gold is +3, find the amount of copper deposited on the cathode in the second cell and the magnitude of the current in ampere respectively.
Given:

Molar mass of gold = 197 g / m o l

Molar mass of copper = 63.5 g / m o l

In jewellery shop, electroplating is done to deposit gold on steel. Now the jewellery appears as gold. Is this a chemical change or a physical change? Give reason.
[2 MARKS]

In an electrolysis experiment current was passed for 5 hours through two cells connected in series. The first cell contains a solution of gold and the second contains copper sulphate solution. 9.85 g of gold was deposited in the first cell. If the oxidation number of gold is +3, find the amount of copper deposited on the cathode of the second cell.

(At.wt. of Au = 197 and At.wt of Cu = 63.5)

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