Which of the following metal is highest electropositive (metallic) in nature ?

(1) Be                                       

(2) Rb

(3) Mn                                       

(4) Tl

Which of the following species must have maximum number of electrons in $\text{'}{d}_{xy}\text{'}$ orbital ?

(1) Cr

(2) $F{e}^{3+}$

(3) $C{u}^{+}$

(4) Both (a) and (b)

The graph that represents the relationship between atomic number (Z) and magnetic moment of d-block elements among the following is-

[Outer electronic configuration : $(n-1)d^{x}n{s}^{1<mspace\; width="1em"></mspace>or<mspace\; width="1em"></mspace>2}]$

1.

2. 

3. 

4. 

Consider the following information about element P and Q :

                        Period number            Group number

P                               2                                 15

Q                               3                                 2

Then formula of the compound formed by P and Q element is :

(1) PQ         

(2) $P_3{Q}_2$           

(3)$Q_3{P}_2$            

(4)$P{Q}_2$

An electronic configuration representing an atom in the excited state is: 

$1.$ $1{\mathrm{s}}^2,2{\mathrm{s}}^{2}2{\mathrm{p}}^1$ $$ $$ $$ $$ $$ $$ $$ $$ $$ $$ $$ $$ $$ $$ $$ $$ $$ $$ $$ $$ $$
$2.$ $1{\mathrm{s}}^2,2{\mathrm{s}}^{2}2{\mathrm{p}}^2$
$3.$ $1{\mathrm{s}}^2,2{\mathrm{s}}^{2}2{\mathrm{p}}^2,3{\mathrm{s}}^1$ $$ $$ $$ $$ $$ $$ $$ $$ $$ $$ $$ $$ $$
$4.$ $1{\mathrm{s}}^2,2{\mathrm{s}}^{2}2{\mathrm{p}}^5$

The incorrect order of radius is :

\(1.~~\mathrm{Sr}^{2+}<{\mathrm{Rb}}^{+}<{\mathrm{Br}}^{-}<\mathrm{Se}^{2-}\)
2. \( \mathrm{Nb}^{5+}<\mathrm{Zr}^{4+}<\mathrm{Y}^{3+}\)
3. \(\mathrm{Co}>\mathrm{Co}^{2+}>\mathrm{Co}^{3+}>\mathrm{Co}^{4+}\)
4. \(\mathrm{Ba}^{2+}<\mathrm{Cs}^{+}<\mathrm{Se}^{2-}<\mathrm{As}^{3-} \)

The correct order of atomic/ionic radii is:

(1) $Sc>Ti>V>Cr<mspace\; width="1em"></mspace>$                               

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

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