Which of the following transformation least energy is required?

(a)                   (b) ${{P}^{-}}_{\left(g\right)}\to {P}_{\left(g\right)}+{e}^{-}$

(c) ${{S}^{-}}_{\left(g\right)}\to {S}_{\left(g\right)}+{e}^{-}$                    (d) $C{{l}^{-}}_{\left(g\right)}\to C{l}_{\left(g\right)}+{e}^{-}$

Concept Questions :-

Electron Affinity (EA)
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Which of the following represents correct order of electron affinity?

(a) Cl>F>S>O                            (b) F>O>S>Cl

(c) F>Cl>S>O                            (d) Cl>S>O>F

Concept Questions :-

Electron Affinity (EA)
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Correct expression of "Allred and Rochow's" scale is:

(a) Electronegativity =$0.744\frac{{Z}_{eff.}}{{r}^{2}}+0.359$

(b) Electronegativity =$0.359\frac{{r}^{2}}{{Z}_{eff.}}+0.744$

(c) Electronegativity =$0.359\frac{{Z}_{eff.}}{r}+0.744$

(d) Electronegativity =$0.359\frac{{Z}_{eff.}}{{r}^{2}}+0.744$

Concept Questions :-

Electronegativity
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The process requiring absorption of energy is:

(a) $N\to {N}^{-}$                       (b) $F\to {F}^{-}$

(c) $Cl\to C{l}^{-}$                      (d) $H\to {H}^{-}$

Concept Questions :-

Electron Affinity (EA)
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Which of the following compounds has a positive enthalpy of solution?

(a) LiF                                         (b) LiCl

(c) LiBr                                        (d) Lil

Concept Questions :-

Lattice/Hydration Energy
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Which of the following compound is most acidic?

(a) $C{l}_{2}{O}_{7}$                              (b) ${P}_{4}{O}_{10}$

(c) $S{O}_{3}$                                 (d) ${B}_{2}{O}_{3}$

Concept Questions :-

Nature of Compound
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If P and T are second period p-block elements then which of the following graph show correct relation between valence electrons in ${P}_{2}$ to ${T}_{2}$ (corresponding molecules) and their bond order is :

(a)                                                                                    (b)

(c)                                                                                     (d)

Concept Questions :-

Modern Periodic Table
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A compound contains three elements A, B and C, if the oxidation number of A =+2, B =+5 and C =-2, the possible formula of the compound is :

(a) ${A}_{3}{\left({B}_{4}C\right)}_{2}$                                  (b) ${A}_{3}{\left(B{C}_{4}\right)}_{2}$

(c) ${A}_{2}{\left(B{C}_{3}\right)}_{2}$                                  (d) $AB{C}_{2}$

Concept Questions :-

Nature of Compound
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Consider the following four elements, which are represented according to long form of periodic table.

Here W, Y and Z are left, up and right elements with respect to the element 'X' and 'X' belongs to 16th group and 3rd period.Then according to given information the incorrect statement regarding given elements is:

(a) Maximum electronegativity :Y              (b) Maximum catenation property :X

(c) Maximum electron affinity :Z               (d) Y exhibits variable covalency

Concept Questions :-

Electron Affinity (EA)
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The ground state electronic configurations of the elements, U,V,W,X,and Y (these symbols do not have any chemical significance) are as follows:

Determine which sequence of elements satisfy the following statements :

(i) Element forms a carbonate which is not decomposed by heating

(ii) Element is most likely to form coloured ionic compounds

(iii) Element has largest atomic radius

(iv) Element forms only acidic oxide

(a) V W Y U                                   (b) V X Y W

(b) V W Y X                                   (d) V X W U

Concept Questions :-

Electronic Configuration
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