Q95 / 180 · AIIMS 2001 · Chemistry

Assertion : Hydrogen nuclei combines to form helium nuclei then energy is released. Reason : Binding energy/nucleon of He is greater than hydrogen.

  • Correct answer
    A
    If both Assertion and Reason are true and Reason is the correct explanation of Assertion.
  • B
    If both Assertion and Reason are true but Reason is not the correct explanation of Assertion.
  • C
    If Assertion is true but Reason is false.
  • D
    If Assertion is false but Reason is true.

Solution

Anuclear reaction in which two lighter nuclei are fused together to form a heavier nuclei is called nuclear fusion. In such a process, more stable nuclei come into existence i.e., binding energy per nucleon increases. Fusionreactionsarehighlyexothermicbecause of loss of mass during fusion. e.g. $$ { }_1^2 \mathrm{H}+{ }_1^2 \mathrm{H} \rightarrow{ }_2^4 \mathrm{He}+24.9 \mathrm{MeV} $$

Hence, the correct answer is option: 'A'.

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