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

How does the energy gap between successive energy levels in an atom vary from low to high n values?

(1) All energy gaps are the same

(2) The energy gap decreases as  n increases

(3) The energy gap increases as  n  increases 

(4) The energy gap changes unpredictably as  n  increases

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

The incorrect order of ionic size among the following is :

(1)$\mathrm{ L}{a}^{3+}>G{d}^{3+}>E{u}^{3+}>L{u}^{3+}$           (2)${\mathrm{ V}}^{2+}>V^{3+}>V^{4+}>V^{5+}$

(3) $T{l}^{+}>I{n}^{+}>S{n}^{2+}>S{b}^{3+}$                (4)${\mathrm{ K}}^{+}>S{c}^{3+}>V^{5+}>M{n}^{7+}$

Aqueous solutions of two compounds $M_1-O-H and M_2-O-H$ are prepared in two different beakers. If, the electronegativity of $M_1=3.4 , M_2=1.2, O=3.5 and H=2.1,$ then the nature of two solutions will be respectively:

(a) acidic, basic             (b) acidic, acidic

(c) basic, acidic             (d) basic, basic