Advertisements
Advertisements
प्रश्न
Buckminsterfullerene is an allotropic form of the element:
(a) phoshorus
(b) fluorine
(c) carbon
(d) sulphur
Advertisements
उत्तर
carbon
Buckminsterfullerene is an allotropic form of the element carbon, and contains 60 carbon atoms joined in a spherical structure.
APPEARS IN
संबंधित प्रश्न
Ethane, with the molecular formula C2H6 has ______.
Why are most carbon compounds poor conductors of electricity?
What type of bonds are present in methane (CH4) and sodium chloride (NaCl)?
State one major difference between covalent and ionic bonds and give one example each of covalent and ionic compounds.
Give one example of a molecule containing a double covalent bond
Give two general properties of ionic compounds and two those of covalent compounds.
What type of bonding would you expect between Carbon and Chlorine?
What type of bonding would you expect between Hydrogen and Chlorine?
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.
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 anode of a dry cell?
What is the difference between ionic compounds and covalent compounds?
Draw an electron dot structure of the following molecule. (Without showing the circle) :
Methanol
The covalent bond in which the electrons are shared equally between the combining atoms.
Explain the following:
Covalent compounds have low melting and boiling point.
Explain the following:
Non-polar covalent compounds are insoluble in water.
Draw an electron dot diagram to show the formation of the following compound.
Methane
Write an Explanation.
Alkyne
Write a short note.
Characteristics of carbon
Cation is formed when ______.
"Carbon prefers to share its valence electrons with other atoms of carbon or with atoms of other elements rather than gaining or losing the valence electrons in order to attain noble gas configuration." Give reasons to justify this statement.
