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KVPY Sample Paper KVPY Stream-SX Model Paper-31

  • question_answer
    An electrolysis of a oxytungsten complex ion using 1.10 A for 40 min produces 0.838 g of tungsten. What is the charge of tungsten in the materials? (Atomic wt., W= 184)

    A) 6

    B) 2    

    C) 4         

    D) 1

    Correct Answer: A

    Solution :

    \[\frac{W}{M}\times n=\frac{I\times t}{96500};\,\,\frac{0.838}{184}\times n\]
    \[=\frac{40\times 60\times 1.0}{96500}\]             \[\Rightarrow n=6\]


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