UPSC Geo Scientist 2025 Prelims Paper II (Chemistry) Question Paper (09-Feb-2025)

Question 1

Which one of the following statements regarding hydrogen atom and other one electron species is correct?

Accepted Answer

For H-atom, s orbital is dependent on the radial wave function (r) only and independent of the angular wave function ($	heta$ and $\phi$).

Answer

For H-atom, s orbital is dependent on both the radial wave function (r) and the angular wave function ($	heta$ and $\phi$).

Answer

For H-atom, there is no such dependence observed for s orbital; rather, the dependence starts with involvement of p orbital.

Answer

For H-atom, s orbital is dependent on the angular wave function ($	heta$ and $\phi$) only and independent of the radial wave function (r).

Question 2

The correct order of penetrating ability of atomic orbitals is :

Accepted Answer

$4s > 4p > 4d > 4f$

Answer

$4f > 4d > 4p > 4s$

Answer

$4p > 4s > 4d > 4f$

Answer

$4d > 4p > 4s > 4f$

Question 3

The correct electronic configuration of Platinum is :

Accepted Answer

$[Xe] \ 4f^{14} \ 5d^9 \ 6s^1$

Answer

$[Xe] \ 4f^{14} \ 5d^{10} \ 6s^0$

Answer

$[Xe] \ 4f^{14} \ 5d^8 \ 6s^2$

Answer

$[Xe] \ 4f^{13} \ 5d^{10} \ 6s^1$

Question 4

The element with the highest enthalpy of atomization in the first transition series is :

Accepted Answer

V

Answer

Fe

Answer

Mn

Answer

Cu

Question 5

An element forms an ion in the +IV oxidation state with electronic configuration : $4d^4 \ 5d^{10}$. Which group and period of the Modern Periodic Table does the element belong to?

Accepted Answer

p-block element from Period - 6 and Group - 14

Answer

d-block element from Period - 6 and Group - 10

Answer

p-block element from Period - 5 and Group - 13

Answer

d-block element from Period - 5 and Group - 12