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. $H\to H^{-}$

Which of the following compound is most acidic?

1. $C{l}_2{O}_7$                              2. $P_4{O}_{10}$

3. $S{O}_3$                                 4. $B_2{O}_3$

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) 

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) $\left[Ar\right]3d^{6}4s^2$

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