Multiple choice

Match the List - A (transition metal/complex) with List - B (uses) and select the correct answer using the codes given below.

 
List - A
List - B
A. Hf 1. Polymerisation
B. AlEt3/TiCl4 2. Making of lead free petrol
C. VC2 3. Neutron moderator
D. Pt-Re alloys 4. Ethyne production

  1. A - 2, B - 1, C - 4, D - 3

  2. A - 3, B - 4, C - 1, D - 2

  3. A - 3, B - 1, C - 4, D - 2

  4. A - 4, B - 2, C - 1, D - 2

  5. A - 4, B - 1, C - 2, D - 3
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Hafnium is used to make control rods for regulating the free neutron levels in the nuclear reactors employed in submarines. The mixture of AlEt3 and TiCl4 is called Zeigler-Natta catalyst and is used extensively in polymerising alkenes (like ethylene to polyethylene). VC2 (vanadium carbide) on treated with water produce ethyne and thus it is used in the production of ethyne. Pt-Re alloys are used as catalysts for making low-lead or lead free petrol. Hence, the correct sequence is A - 3, B - 1, C - 4, D - 2.

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