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The First (δ1h1) and the Second (δ1h2) Ionization Enthalpies (In Kj Mol-1) and the (δEgh) Electron Gain Enthalpy (In Kj Mol-1) of a Few Elements - CBSE (Science) Class 11 - Chemistry

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Question

The first (Δ1H1) and the second (Δ1H2) ionization enthalpies (in kJ mol-1) and the (ΔegH) electron gain enthalpy (in kJ mol-1) of a few elements are given below:

Elements Δ1H1 Δ1H2 ΔegH
I 520 7300 -60
II 419 3051 -48
III 1681 3374 -328
IV 1008 1846 -295
V 2372 5251 +48
VI 738 1451 -40

Which of the above elements is likely to be the metal which can form a stable binary halide of the formula MX2, (X=halogen).

Solution

Element VI has a low negative electron gain enthalpy (ΔegH). Thus, it is a metal. Further, it has the lowest second ionization enthalpy (Δ1H2). Hence, it can form a stable binary halide of the formula MX2(X=halogen).

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APPEARS IN

 NCERT Solution for Chemistry Textbook for Class 11 (2018 to Current)
Chapter 3: Classification of Elements and Periodicity in Properties
Q: 31.5 | Page no. 94

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Solution The First (δ1h1) and the Second (δ1h2) Ionization Enthalpies (In Kj Mol-1) and the (δEgh) Electron Gain Enthalpy (In Kj Mol-1) of a Few Elements Concept: Periodic Trends and Chemical Reactivity.
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