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) 

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) $\left[Ar\right]3d^{6}4s^2$

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

Incorrect order of ionic size is :

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

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

Consider the following changes:

 $M\left(s\right)\to M\left(g\right) .....\left(i\right)$
$M\left(s\right)\to M^{2+}\left(g\right)+2e^{- } .....\left(ii\right)$
$M\left(g\right)\to M^{+}\left(g\right)+e^{-} .....\left(iiii\right)$
$M^{+}\left(g\right)\to M^{2+}\left(g\right)+e^{- } ......\left(iv\right)$
$M\left(g\right)\to M^{2+}\left(g\right)+2e^{-} ......\left(v\right)$

The second ionization energy of M could be calculated from the energy values associated with :

(a) 1+3+4                  (b) 2-1+3

(c) 1+5                      (d) 5-3

Which of the following statements is incorrect?

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