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JEEMAIN and NEET
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JEEMAIN PAST PAPERS
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2013
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Q)
The first ionization potential of Na is 5.1 eV. The value of electron gain enthalpy of $Na^+$ will be :
( A ) $-10.2\; eV$
( B ) $-2.55 \; eV$
( C ) $+2.55 \; eV$
( D ) $-5.1\; eV$
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