1.

      A woman desires to clean the surface of her gold ornaments by a chemical approach. For this she requires to use [CDS]

A. aqua-regia
B. concentrated \[{{H}_{2}}S{{O}_{4}}\]
C. concentrated NaOH
D. sodium thiosulphate solution
Answer» B. concentrated \[{{H}_{2}}S{{O}_{4}}\]


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