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     EduGorilla 
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    A scientist is trying to find a cure for the Ebola using four ingredients. He can choose from the stable chemicals hydrogen, helium and lithium and the unstable chemicals Neon, Argon, Radium and Chlorine. In order for the formula not to explode, there must be two stable chemicals in it. Also, certain chemicals cannot be mixed because of their reaction together. Helium cannot be mixed with Neon. Lithium cannot be mixed with Radium. Radium cannot be mixed with Chlorine.


    Which of the following combinations of chemicals is impossible?
    I. Using Radium and Neon together.
    II. Using Helium and Lithium together.
    III. Using Neon, Argon and Chlorine together.

    Options :-

    1. III only
    2. I and III only
    3. I only
    4. II only
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