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UPSC Chemistry Classification of Elements and Periodicity in Properties / तत्त्वों का वर्गीकरण एवं गुणों में आवर्ति Question Bank Elements Classification and Chemical Bonding

  • question_answer
          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

    Correct Answer: A

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