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JEE Main 20204 SeptemberEvening Shift
Exam
JEE Main
Year
2020
Date
4 September
Shift
Evening Shift
Subject
Chemistry
Chapter
Classification of Elements and Periodicity in Properties

JEE Main 2020 · 4 September · Evening Shift · Chemistry · Classification of Elements and Periodicity in Properties

The process that is NOT endothermic in nature is :

The process that is NOT endothermic in nature is :

Options

  1. A{Ar}_{( g )} + {e}^{-} \to {Ar}_{\left(g\right)}^{-}
  2. B{H}_{( g )} + {e}^{-} \to {H}_{\left(g\right)}^{-}
  3. CO(g)−+e−→O(g)2−{O}_{( g )}^{-} + {e}^{-} \to {O}_{( g )}^{2 -}
  4. DNa(g)→Na(g)++e−{Na}_{( g )} \to {Na}_{\left(g\right)}^{+} + {e}^{-}

Correct answer

B. {H}_{( g )} + {e}^{-} \to {H}_{\left(g\right)}^{-}

Step-by-step solution

H(g)+e-→extremicH-(g){\text{H}}_{\text{(g)}}{\text{+e}}^{\text{-}}\overset{\text{extremic}}{\to}{\text{H}}^{\text{-}}\text{(g)} ΔHeg=−72KJ/mol{\Delta H}_{eg} = - 72KJ / mol
O−(g)+e−⟶→endeterm cO2−(g){O}^{-} ( g ) + {e}^{-} ⟶ \overset{\text{endeterm c}}{\to}{O}^{2 -} ( g ) ΔHeg=+744KJ/mol{\Delta H}_{eg} = + 744KJ / mol
Ar(g)+e−→endetermcAr−(g){Ar}_{( g )} + {e}^{-}\overset{\text{endeterm}c}{\to}{Ar}^{-} ( g ) ΔHeg=+96KJ/mol{\Delta H}_{eg} = + 96KJ / mol
Na(g)⟶endothermcNa+(g)+e−Na ( g ) \overset{\text{endotherm}c}{⟶}{Na}^{+} ( g ) + {e}^{-} IE=495.8KJ/mol\text{IE} = 495 . 8KJ / mol

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