Q 41 :

The metal ion whose electronic configuration is not affected by the nature of the ligand and which gives a violet colour in non-luminous flame under hot condition in borax bead test is           [2025]

• ${\mathrm{Ti}}^{3+}$
     

• ${\mathrm{Ni}}^{2+}$
     

• ${\mathrm{Mn}}^{2+}$
     

• ${\mathrm{Cr}}^{3+}$

   

Q 42 :

Consider the following elements In, Tl, Al, Pb, Sn and Ge.

The most stable oxidation states of elements with highest and lowest first ionisation enthalpies, respectively, are           [2025]

• +2 and +3

   

• +4 and +3

   

• +4 and +1

   

• +1 and +4

   

Q 43 :

Identify the inorganic sulphides that are yellow in colour :

(A) ${\left({\mathrm{NH}}_4\right)}_2\mathrm{S}$
(B) PbS
(C) CuS
(D) ${\mathrm{As}}_2{\mathrm{S}}_3$
(E) ${\mathrm{As}}_2{\mathrm{S}}_5$

Choose the correct answer from the options given below :              [2025]

• (A) and (C) only

   

• (A), (D) and (E) only

   

• (A) and (B) only

   

• (D) and (E) only

   

Q 44 :

A group 15 element forms $d\pi –d\pi$ bond with transition metals. It also forms hydride, which is a strongest base among the hydrides of other group members that form $d\pi –d\pi$ bond. The atomic number of the element is ____.          [2025]

Q 45 :

The nature of oxide (${\mathrm{TeO}}_2$) and hydride (${\mathrm{TeH}}_2$) formed by Te, respectively are:            [2025]

• Oxidising and acidic

   

• Reducing and basic

   

• Reducing and acidic

   

• Oxidising and basic

   

Q 46 :

A molecule with the formula ${\mathrm{AX}}_2{\mathrm{Y}}_2$ has all its elements from p-block. Element A is rarest, monotomic, non-radioactive from its group and has the lowest ionization energy value among X and Y. Elements X and Y have first and second highest electronegativity values respectively among all the known elements. The shape of the molecule is:     [2025]

• Square pyramidal

   

• Octahedral

   

• Planar

   

• Tetrahedral

   

Q 47 :

Given below are two statements:                                        [2025]

Statement I: The metallic radius of Al is less than that of Ga.

Statement II: The ionic radius of ${\mathrm{Al}}^{3+}$ is less than that of ${\mathrm{Ga}}^{3+}$.

In the light of the above statements, choose the most appropriate answer from the options given below:

• Both Statement I and Statement II are correct

   

• Statement I is correct but Statement II is incorrect

   

• Statement I is incorrect but Statement II is correct

   

• Both Statement I and Statement II are incorrect

   

Q 48 :

"X" is an oxoanion of the lightest element of group 7 (in the periodic table). The metal is in +6 oxidation state in "X". The color of the potassium salt of X is          [2026]

• orange

   

• purple

   

• yellow

   

• green

   

Q 49 :

The oxidation state of chromium in the final product formed in the reaction between KI and acidified $K_{2}C{r}_2{O}_7$ solution is:  [2026]

• +4

   

• +2

   

• +6

   

• +3