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ALLOTROPES OF CARBON...

ALLOTROPES OF CARBON

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Assertion : O_(3) has higher boiling point than O2. Reason : O_(3) is allotrope of oxygen.

A : Fullerene is the purest allotrope of carbon . R : They have smooth structure without danging bonds .

Assertion (A) : C_(60) fullerence is an allotrope if carbon. Reason (R) :In C_(60) fullerene , five -menmebrd rings are isolated forem each other .

Elemental carbon appears in many structural forms or allotropes . Three of these forms are crystalline -diamond ,graphite and the recently discovered fullerene (bucky ball ) -while more than 40 others including coke and carbon black are amorphous . Now there seems to be set as fourth crystalline allotrope of carbon. reported in 1995 by Lagow at the University of Texas . Newly discovered allotrope of carbon has the form :

Select the correct answer from A, B, C, D & E for each statement given below: A: Anthracite B: Diamond C: Carbogen D: Urea E: Lampblack An allotrope of carbon used as a tip for deep boring drills

Select the correct answer from A, B, C, D & E for each statement given below: A: Anthracite B: Diamond C: Carbogen D: Urea E: Lampblack An allotrope of carbon, obtained by burning kerosene oil in a limited supply of air.

Assertion : Among the carbon allotropes, diamond is an insulater, wherea, graphite is a good conductor of electricity. Reason : Hybridization of carbon in diamond and graphite are sp^3 and sp^2 , respectively.

Assertion : Ozone is an allotrope of oxygen. Reason : Oxygen is bluish colour liquid and in singlet state it is more paramagnetic.

Below point 'A' FeO can __________ (a)be reduced by carbon monoxide only. (b)Be reduced by both carbon monoxide and carbon. (c)be reduced by carbon only (d)not be reduced by both carbon and carbon monoxide