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Which statement about CO2 vibrations is correct?

The asymmetric stretch is Raman active only.

The symmetric stretch is IR inactive due to the center of inversion.

All three fundamental modes are IR active.

The bending mode is Raman inactive and IR inactive.

Which of the following will be most stabilized in a soft donor solvent (e.g., Me2S)?

Al3+

Mg2+

Ag+

Li+

Which reaction proceeds to the right (formation favored) via HSAB?

Fe3+ + 2 I− → FeI2+ (aq) strongly favored

Au+ + 2 F− → AuF2−

Au+ + 2 I− → AuI2−

Mg2+ + S2− → MgS less stable than MgO

Which is the correct order of softness for neutral donors?

PR3 > SR2 > NR3 > OR2

SR2 > NR3 > PR3 > OR2

NR3 > OR2 > PR3 > SR2

OR2 > NR3 > PR3 > SR2

Which pair best exemplifies a differentiating solvent effect in acetic acid?

All strong acids are leveled to H2OAc+

HNO3 and HClO4 equal strengths

HCl and HBr identical strengths

HClO4 stronger than HCl (both not equally leveled)

Which statement about ionic liquids is FALSE?

They always provide completely benign toxicity profiles.

Some can dissolve metal salts and enable electrochemistry.

Their properties can be tuned by cation/anion choice.

They generally have negligible vapor pressure.

Which molten salt statement is correct?

All molten salts act as oxidants due to Cl2 formation.

Molten nitrates are molecular and non‑conducting.

Molten NaCl consists of discrete NaCl molecules.

AlCl3 forms AlCl4−/Al2Cl7− species in chloride melts, altering acidity/basicity of the medium.

Among CO, CN−, and NO+, which has the highest stretching frequency (strongest bond) in the gas phase?

All equal

NO+ ≈ CN− > CO

CN− > CO > NO+

CO > NO+ > CN−

Which statement about Walsh diagrams for triatomics is correct?

Adding electrons to antibonding orbitals in XH2 often bends a linear geometry (e.g., CH2).

Electron count does not affect geometry in small molecules.

Adding electrons always linearizes bent molecules.

Walsh rules are irrelevant to geometry.

Which of the following diatomic species is predicted to be most reactive toward back‑bonding to metals (best π‑acceptor)?

Rank	User	Score	Date
#1	User 0	40%	September 21, 2025
#2	info@tamilalliance.com	10%	September 8, 2025

Chemistry — Unit 1 — Test 9

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