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Identify the correct statement from the ...

Identify the correct statement from the following
I) Graphite is used as dry lubricant, as it posses slippary nature
II) Diamond is thermodynamically more stable than graphite
III) Carbon black, coke, charcoal are impure forms of graphite or fullerenes
IV) Diamond is measured in carats and one carat is 200 gm. 

A

I, III only

B

II, IV only

C

I, II, III

D

II, III, IV

Text Solution

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The correct Answer is:
A
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AAKASH SERIES-ELEMENTS OF CARBON FAMILY-OBJECTIVE EXERCISE - 2
  1. (A): Even though diamond is covalent, it has a high melting point (R...

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  2. Which of the following is true about fullerenes?

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  3. Identify the correct statement from the following I) Graphite is use...

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  4. Regarding diamond I) C-C bond length is 1.54Å II) It has least ref...

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  5. Which of the following is used as black pigment in black ink ?

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  6. The correct statement regarding Graphite is

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  7. The reaction that gives CO(2) as one of the products is

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  8. Mark the oxide which is amphoteric in character

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  9. Which one of the following elements reacts with steam?

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  10. The hybrid orbitals with 33.33% s-character are involved in the bondin...

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  11. The number of Pentagons and Hexagons, respectively in Co-Fullerence ar...

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  12. The hybridisation of C in diamond, graphite and ethyne is in the order

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  13. Silica is insoluble

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  14. SiO2 is a solid while CO2 is a gas - explain.

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  15. In hydrofluorosilicic acid the covalency of Si is

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  16. Regarding silica I) Quartz is amorphous form of silica II) Silica ...

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  17. SiO(2) reacts with which of the following to form water glass

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  18. Which of the following is a crystalline form of silica ?

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  19. Hybridisation of carbon atom in carbon dioxide is

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  20. Which of the following acts as a reducing agent ?

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