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]