Railways R.R.C. (Hazipur) Solved Paper Held on 1-12-2013

  • question_answer
    Which of the following is known as 'Laughing Gas?

    A) \[N{{O}_{2}}\]            

    B) \[S{{O}_{2}}\]

    C) \[{{S}_{2}}O\]                         

    D) \[{{N}_{2}}O\]

    Correct Answer: D


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