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AFMC AFMC Solved Paper-2007

  • question_answer
    When a sample of solid lithium is placed in a flask of hydrogen gas then following reaction happened \[{{^{1}}_{1}}H{{+}_{3}}L{{i}^{7}}{{\xrightarrow[{}]{{}}}_{2}}H{{e}^{4}}{{+}_{2}}H{{e}^{4}}\] This statement is                

    A) true

    B) false                                    

    C) may be true at a particular pressure  

    D) none of the above               

    Correct Answer: B

    Solution :

    The given reaction is a nuclear reaction, which can take place only if a proton (a hydrogen nucleus) comes into contact with a lithium nucleus. If the hydrogen is in the atomic form, the interaction between its electron cloud and the electron cloud of a lithium atom keeps the two nuclei from getting close to each other. Even if isolated protons are used, they must be fired at the Li atom with enough kinetic energy to overcome the electric repulsion between the proton and Li atom.


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