35.

36.

87.

38.

39.

The solubility products of AgCl and PbClz are 1.8 x 10-!° and 1.7 x 10° respectively at room
temperature. Hydrochloric acid is added to a solution that contains Ag* and Pb?+ until the

equilibrium concentration of Cl becomes 0.10 M. What will be the concentrations of Pb?* at
equilibrium?

(A) 1-6 (8) 1.7x 104M
(© 17x 103M (0) 1.8x10-°M

Which of the following statements are INCORRECT?
0) Asolution of EDTA can be standardized using CaCOs.
Gi) EDTA combines with metal ions in a 1: 1 ratio regardless of the charge on the cation.

2) Generally, the indicators used in EDTA titrations are organic dyes that form colored
chelates with metal ions.

(iv) In the determination of hardness of water, often, a small concentration of magnesium-
EDTA chelate is incorporated in the buffer or in the titrant.

(A) @ and Gi) (B) (i and (iv)
(0) Gii) and (iv) (D) None

Which of the following statement(s) is/are related to Heisenberg’s Uncertainity Principle?
0) The concept of orbitals for electrons instead of orbits.
(i) Broadening of molecular spectra.
(111) It is related to the wave-particle duality of particles.
(iv) It affects the precision in measuring the energy levels of molecules.
(^) @ alone (B) (i) and (iv)
(C) ii), (iii) and (iv) (D) Allof these
Among the following compounds, which one exhibits all three types of chemical bonds : ionic,
covalent and coordinate bonds?
(¢^) ೫,೮] (B) KCLMgClz
(C) Hydrochloric acid (D) Fe(OH):

Unpolluted rainwater is :
(A) Neutral
(B) Slightly acidic
(C) Slightly basic
(D) Slightly acidic or basic depending on the season

161/2023-M 8 A