Tamil Nadu Class 12 Chemistry Term 1 Unit Test — Samacheer Kalvi

Coverage

• Metallurgy
• p-Block Elements I and II
• Transition and Inner Transition Elements
• Coordination Chemistry
• Solid State
• Chemical Kinetics

Section A - One Mark

1. Define calcination. 2. Write the oxidation state of chromium in K2Cr2O7. 3. Name one ambidentate ligand. 4. How many atoms are present in an fcc unit cell? 5. State the unit of rate constant for a first-order reaction. 6. Which defect is responsible for colour in alkali halide crystals? 7. What is lanthanoid contraction? 8. Name the catalyst used in the contact process. 9. Write the IUPAC name of [Cu(NH3)4]2+. 10. State one example of a pseudo first-order reaction.

Section B - Short Answer

1. Distinguish calcination and roasting. 2. Explain Werner's primary and secondary valencies with one example. 3. Compare Schottky and Frenkel defects. 4. Distinguish order and molecularity. 5. Why do transition elements show variable oxidation states?

Section C - Long Answer / Problems

1. Explain the extraction of a metal from its ore using the steps concentration, reduction, and refining. 2. Derive the first-order rate equation and state the half-life relation. 3. Explain geometrical and optical isomerism in coordination compounds with examples.

Correction Checklist

• Recheck every oxidation-state calculation.
• Confirm whether each solid-state answer uses sc, bcc, or fcc data correctly.
• Rewrite one rate-law problem without looking at the formula sheet.