Incorrect order of radius is :

1. \(  S r^{2 +}   < \left(Rb\right)^{+} < \left(Br\right)^{‐}   < \left(Se\right)^{2 -}                            \)     
2. \(Co > Ni > Cu > Zn\)
3. \(  Co > \left(Co\right)^{2 +} > \left(Co\right)^{3 +} > \left(Co\right)^{4 +}                              \)   
4. \(A s^{3 -} > S e^{2 -} > C s^{+} > B a^{2} +\)

The correct order of atomic/ionic radii is:

(1) $Sc>Ti>V>Cr$                               

(2) $Co>Ni>Cu>Zn$                                      

(3) $S^{2-}>C{l}^{-}>O^2>N^{3-}$                         

(4) None of these

Which of the following transformation least energy is required?

(1) ${F^{-}}_{\left(g\right) }\to F_{\left(g\right)} +e^{-}$                 

(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:

                             $U 1s^{2}2s^{2}2p^3$
$V 1s^{2}2s^{2}2p^{6}3s^1$
$W 1s^{2}2s^{2}2p^{6}3s^{2}3p^2$
$X 1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}3d^{5}4s^2$
$Y 1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}3d^{10}4s^{2}4p^6$

Determine which sequence of elements satisfy the following statements :

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

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

(iii) Element has a largest atomic radius

(iv) Element forms an only acidic oxide

(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