The following property/ies decrease from left to right across the periodic table and increase from top to bottom:

(i) Atomic radius (ii) Electronegativity (iii) Ionisation energy (iv) Metallic character

1.	(i) only	2.	(i), (ii), and (iii)
3.	(i), (iii), and (iv)	4.	(i), and (iv)

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. $B_2{O}_3$