Which of the following transformation least energy is required?

(1) ${F^{-}}_{\left(g\right)<mspace\; width="1em"></mspace><mspace\; width="1em"></mspace>}\to F_{\left(g\right)}<mspace\; width="1em"></mspace>+e^{-}$                 

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

(3) ${S^{-}}_{\left(g\right)}\to S_{\left(g\right)}+e^{-}$                   

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

Which of the following represents correct order of electron affinity?

(1) Cl>F>S>O                           

(2) F>O>S>Cl

(3) F>Cl>S>O                           

(4) Cl>S>O>F

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 =$0.359\frac{Z_{eff.}}{r^2}+0.744$

The process that requires absorption of energy is:

1. $N\to N^{-}$                       

2. $F\to F^{-}$

3. $Cl\to C{l}^{-}$                     

4. $H\to H^{-}$

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:

1. Maximum electronegativity :Y             

2. Maximum catenation property :X

3. Maximum electron affinity :Z               

4. Y exhibits variable covalency

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:
\(\begin{array}{ll} \mathrm U & 1 s^2 2 s^2 2 p^3 \\ \mathrm{V} & 1 s^2 2 s^2 2 p^6 3 s^1 \\ \mathrm{W} & 1 s^2 2 s^2 2 p^6 3 s^2 3 p^2 \\ \mathrm{X} & 1 s^2 2 s^2 2 p^6 3 s^2 3 p^6 3 d^5 4 s^2 \\ \mathrm{Y} & 1 s^2 2 s^2 2 p^6 3 s^2 3 p^6 3 d^{10} 4 s^2 4 p^6 \end{array}\)

Determine which sequence of elements satisfies the following statements :

1. V W Y U
2. V X Y W
3. V W Y X
4. V X W U

Which one will show variable oxidation state?

(I) $\left[Kr\right]5s^1$                                 (II) $\left[Rn\right]5f^{14}6d^{1}7s^2$
(III)$\left[Ar\right]3d^{10}4s^{2}4p^5$                    (IV) $\left[Ar\right]3d^{6}4s^2$

If period number and group number of any representative element(s) are same then which of the following statement is incorrect regarding such type element(s) in their ground state?

(1) The possible value of principal quantum number is 2

(2) The possible value of azimuthal quantum number is zero

(3) The possible value of magnetic quantum number is 1

(4) The species could be paramagnetic

How does the energy gap between successive energy levels in an atom vary from low to high n values?

(1) All energy gaps are the same

(2) The energy gap decreases as  n increases

(3) The energy gap increases as  n  increases 

(4) The energy gap changes unpredictably as  n  increases

In alkaline earth metals, the properties, from the following, that will increase from Be to Ba are-

(i) Atomic radius       
(ii) Ionisation energy       
(iii) Nuclear charge