SELECT * FROM question_mgmt as q WHERE id=4370 AND status=1 SELECT id,question_no,question,chapter FROM question_mgmt as q WHERE courseId=12 AND subId=16 AND chapterId=367 and ex_no='1' AND status=1 ORDER BY CAST(question_no AS UNSIGNED) CBSE Free NCERT Solution of 8th science Materials: Metals and Non-Metals one day reeta went to a jeweller rsquo s shop with

Question:

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:

Jeweller dipped the jewelry in a liquid solution called aqua regia to polish a gold ornament. Aqua regia is a mixture of hydrochloric acid and nitric acid. The outer layer of gold is dissolved in aqua regia and the inner shiny layer appears. Reduction of weight of gold is occurs due to the dissolution of outer layer of gold in aqua regia solution.   


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