Allotropes of Carbon
One of the following is not an allotrope of carbon. This is :
(a) diamond (b) graphite (c) cumene (d) buckminsterfullerene
Diamond and graphite are the covalent compounds of carbon element (C).
(a) phosphorus (b) fluorine (c) carbon (d) sulphur
Is Diamond an insulator?
Why is graphite used for making electrodes in a dry cell?
Write a short note on graphite.
Why Graphite is a better lubricant than oil?
Allotropy is the property of some chemical elements to exist in two or more different forms, but in different physical state.
(a) What is buckminsterfullerene? How is it related to diamond and graphite?
(b) Why is diamond used for making cutting tools (like glass cutters) but graphite is not?
(c) Why is graphite used for making dry cell electrodes but diamond is not?
Is they a difference between strong and weak covalent bonds if any?
Carbon exists only in the combined state in nature.
What is meant by allotropy? How are all the allotropic forms of Carbon classified?
Diamond and graphite are two naturally occurring forms of the element carbon.
Write True or False for the following statement:
Diamond is a bad conductor of electricity and heat.
An element E exists in three allotropic forms A, B and C. In allotrope A, the atoms of element E are joined to form spherical molecules. In allotrope B, each atom of element E is surrounded by three other E atoms to form a sheet-like structure. In allotrope C, each atom of element E is surrounded by four other E atoms to form a rigid structure.
(a) Name the element E.
(b) What is allotrope A?
(c) What is allotrope B?
(d) What is allotrope C?
(e) Which allotrope is used in making jewellery?
(f) Which allotrope is used in making the anode of a dry cell?
Which of the following statement(s) is/are correct about carbon compounds?
(i) Carbon has the ability to form covalent bonds with other atoms of carbon giving rise to a large number of molecules through a self-linking property.
(ii) Carbon compounds do not show isomerism.
(iii) Carbon compounds are highly unstable compounds.
(iv) Carbon compounds have low melting and boiling points.
i, ii and iii
i and iv
A solid element X has four electrons in the outermost shell of its atom. An allotrope Y of this element is used as a dry lubricant in machinery and also in making pencil leads.
(a) What is element X?
(b) Name the allotrope Y.
(c) State whether allotrope Y is a good conductor or non-conductor of electricity.
(d) Name one use of allotrope Y (other than lubrication and pencil leads)
(e) Name two other allotropes of element X.
Allotropes are forms of the _______ element but have ________ physical properties.
- different, same
- different, different
- same, same
Name two amorphous forms of carbon
Draw and explain the structure of diamond and graphite.
The atoms in a diamond are arranged in …………manner.
Carbon exists in two allotropic forms.
Why is graphite soft and slippery to touch?
- Is it true that crystalline forms of carbon having 30 to 960 atoms in their molecules are called Fullerenes ?
- Why carbon monoxide, carbon dioxide, carbonates, bicarbonates and carbides are not considered organic compounds ?
The solid element A exhibits the property of catenation. It is also present in the form of a gas B in the air which is utilised by plants in photosynthesis. An allotrope C of this element is used in glass cutters.
(a) What is element A?
(b) What is the gas B?
(c) Name the allotrope C.
(d) State another use of allotrope C (other than in glass cutters)
(e) Name another allotrope of element A which exists as spherical molecules.
(f) Name a yet another allotrope of element A which conducts electricity.