Match List-I with List-II
| List-I | List-II |
| (A) Ziegler Natta Catalyst | (I) Alloy of Lanthanoids |
| (B) Mischmetall | (II) Diamagnetic |
| (C) Cu+2 | (III) TiCl4 and Al(CH3)3 |
| (D) repelled by the applied field | (IV) Paramagnetic |
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 4
The correct answer is Option (4) → (A) - (III), (B) - (I), (C) - (IV), (D) - (II)
This question combines facts about the d- and f-block elements. For the magnetic items: a substance with unpaired electrons is paramagnetic and is attracted by a magnetic field, while a substance with all electrons paired is diamagnetic and is repelled.
(A) Ziegler Natta Catalyst — This matches (III) TiCl4 and Al(CH3)3. This combination of \( \ce{TiCl4} \) with a trialkylaluminium is used as the catalyst in making polyethylene.
(B) Mischmetall — This matches (I) Alloy of Lanthanoids. It contains about 95% lanthanoid metal and 5% iron, with traces of S, C, Ca and Al. It is used in bullets, shells and lighter flints.
(C) Cu+2 — This matches (IV) Paramagnetic. Cu (Z = 29) is [Ar]3d104s1; losing the 4s electron and one 3d electron gives Cu2+: [Ar]3d9, with one unpaired electron.
(D) repelled by the applied field — This matches (II) Diamagnetic. Diamagnetic substances are weakly repelled by a magnetic field.
Shortcut: The pair (A)–(III) appears in Options (3) and (4), and (B)–(I) then leaves only Option (4).