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Q.

LIST - 1LIST - 2
A) IVA group1) Amorphous
B) Tridymite2) Crystalline form of silica
C) Lubricant3) Graphite
D) Hardest material4) ns2np2
 5) Diamond

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a

A B C D

5 3 2 4

b

A B C D

2 4 3 5

c

A B C D

4 2 3 5

d

A B C D

2 3 5 4

answer is C.

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Detailed Solution

  • Tridymite  is a crystalline form of silica. 
  • Group IV has general electronic configuration : ns2np2.
  • Graphite is used as dry lubricant. 
  • Diamond is the hardest material.
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