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Catenation

Q. Write true...

Question

Q. Write true or false against the following statements : (a) Carbon constitutes 0.03 % of earth's crust (b) Graphite is the purest from of carbon (c) Coloured diamonds are coslier than colourless and transparent diamonds (d) Graphite has layer of hexagonal carbon bondings (e) Diamond is insoluble in all solvents

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Solution

Dear student ,

(a) False : Carbon occures in 0.18 % in earth crust's
(b) False : Diamond is the purest form of carbon
(c) False : transparent diamond is mor costlier .
(d) True
(e) True
Regards

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Similar questions

Write 'true' or 'false' against the following statements :

(a) Carbon constitutes 0.03 $%$ of the earth's crust.

(b) Graphite is the purest form of carbon.

(c) Coloured diamonds are costlier than colourless and transparent diamonds.

(d) Graphite has layers of hexagonal carbon bondings.

(e) Diamond is insoluble in all solvents.

Q. Statements: All coals are diamonds.
All diamonds are graphite.
No graphite is carbon.
Conclusions: I. No coal is carbon.
II. No diamond is carbon.

Q. State whether the following statement is true or false :
Diamond and graphite are the covalent compounds of carbon element (C).

Q. Which of the following statements is/are incorrect for diamond?
(a) The refractive index of diamond is highest among solids.
(b) Diamond is hard because all the valence electrons of each carbon atom are involved in bond formation.
(c) Diamond is thermodynamically more stable than graphite.
(d) One carat of diamond represents its weight.

Q. Consider the following statements
I : In diamond, each carbon atom is linked tetrahedrally for four other carbon atoms by

{s p}^{3}

bonds.
II : Graphite has planar hexagonal layers of carbon atoms held together by weak Van der Waal's forces.
III : Silicon exists only in diamond structure due to its tendency to form

p π - p π

bonds to itself.

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