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)$P{Q}_2$

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 radius of which ion is closest to that of $L{i}^{+}$ ion ?

1. $N{a}^{+}$                                       

2. $B{e}^{2+}$

3. $M{g}^{2+}$                                       

4. $A{l}^{3+}$

The correct order of ${\mathrm{IE}}_2$ is:

(1) Ne>F>O>N                     

(2) O>F>Ne>N

(3) Ne>O>F>N                     

(4) O>Ne>F>N

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. $H\to H^{-}$

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)