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Mass numbers of the elements A,B , C and...

Mass numbers of the elements A,B , C and D are 30,60,90 and 120 respectively. The specific binding energy of them are 5 MeV, 8.5 MeV , 6 MeV and 7 MeV respectively. Then, in which of the following reaction/s energy is released ?
(1)D`to`2B , (2)C `to`B +A , (3 )B `to`2A

A

only in (1)

B

only in (3)

C

in (1) , (3)

D

in (1), (2) and (3)

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The correct Answer is:
a
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NCERT FINGERTIPS ENGLISH-NUCLEI-Assertion And Reason
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  7. Assertion:Nuclear force between neutron-neutron, proton-neutron and pr...

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  8. Assertion:A free neutron is unstable Reason : Free neutron disintegr...

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