Question

(i) The coordination number of Ag$^+$ ion in $[Ag(CN)_2]^-$ is _______.

(ii) The E.A.N. of Co in $[Co(NH_3)_6]^{3+}$ is _______.

(iii) The term letter for C.M.I. with d$^2$ configuration is _______.

(iv) The reactions taking place in the absence of light are called _______.

(B) Select the correct alternative:

(i) The hybridization of N- in Pyrrole is

(ii) Raman effect is based on the phenomenon:

(iii) Sulphanilamide is _______.

(iv) Fluorescence and phosphorescence are _______ processes.

• A. sp
• B. sp$^2$
• C. sp$^3$
• D. None of these

Answer 1

Answer: (B)

(i) 2 (ii) 36 (iii) F (iv) Dark reactions (B) (i) (b) sp² (ii) (d) Scattering (iii) (a) Antibacterial (iv) (c) Photophysical

Answer 2

Part A (Fill in the Blanks)

1. Coordination number of Ag⁺ in [Ag(CN)₂]⁻:
   Since there are two CN⁻ ions bound to Ag⁺, the coordination number is 2.

2. EAN of Co in [Co(NH₃)₆]³⁺:
   EAN = Atomic number − Oxidation state + (electrons donated by ligands)
   = 27 − 3 + (6 × 2) = 27 − 3 + 12 = 36.

3. Term letter for C.M.I. with d² configuration:
   The free ion ground term for a d² configuration is ³F so the term letter is F.

4. Reactions taking place in the absence of light:
   These are called dark reactions.

Part B (Multiple Choice Questions)

1. Hybridization of N in Pyrrole:
   In pyrrole, the nitrogen atom is part of the aromatic system and is sp² hybridized.

2. Raman effect is based on the phenomenon:
   Raman effect arises due to the scattering of light.

3. Sulphanilamide is:
   Sulphanilamide is known to be an antibacterial agent.

4. Fluorescence and phosphorescence are processes that are:
   They are photophysical processes.