A noble metal is one which is inert and does not react with acids like HCl,HNO3,H2SO4. Select an option with a set of two noble metals.
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Q2
Choose the correct option(s) for electroplating of gold (Au) onto a silver (Ag) medal.
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Q3
94.Does making of gold amulgum is a chemical reaction ?(Au+Hg gives Au-Hg)
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Q4
Pure gold is not hard. It is alloyed with silver and/or copper to make jewellery. If a sample of gold contains 80%,12%and8% gold, silver and copper respectively, then the number of gold atoms present in 2gram of the sample is:
[Given: Atomic mass of Au=197u]
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Q5
A noble metal is one which is inert and does not react with acids like HCl,HNO3,H2SO4. Select an option with a set of two noble metals.