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One day Reeta went to a jeweller's shop with her mother. Her m
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One day Reeta went to a jeweller's shop with her mother. Her mother gave old gold jewellery to the goldsmith to polish. Next day when they brought the jewellery back, they found that there was a slight loss in its weight. Can you suggest a reason for the loss in weight?

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One day Reeta went to a jeweller's shop with her mother. Her mother gave old gold jewellery to the goldsmith to polish. Next day when they brought the jewellery back, they found that there was a slight loss in its weight. Can you suggest a reason for the loss in weight?
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To polish a gold ornament, it is dipped in a liquid called aquaregia (a mixture of hydrochloric acid and nitric acid). On getting the environment of aquaregia, the outer layer of gold dissolves and the inner shiny layer appears. The dissolving of the layer causes a reduction in the weight of the jewellery..
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Practice questions from similar books

Question 1
One day Reeta went to a jeweller's shop with her mother. Her mother gave old gold jewellery to the goldsmith to polish. Next day when they brought the jewellery back, they found that there was a slight loss in its weight. Can you suggest a reason for the loss in weight?

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Question 2
Fill in the blanks:

(a) Phosphorus is very _____ non-metal.

(b) Metals are ____ conductors of heat and ____ .

(c) Iron is ______ reactive than copper.

(d) Metals react with acids to produce _____ gas.

View solution

Question 3
What happens when:
(a) dilute sulphuric acid is poured on a copper plate?
(b) iron nails are placed in copper sulphate solution?

Write word equations of the reactions involved.

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Question 4
Which of the following can be beaten into thin sheets?

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Question Text
One day Reeta went to a jeweller's shop with her mother. Her mother gave old gold jewellery to the goldsmith to polish. Next day when they brought the jewellery back, they found that there was a slight loss in its weight. Can you suggest a reason for the loss in weight?
Answer TypeText solution:1
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