Advertisements
Advertisements
प्रश्न
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?
Advertisements
उत्तर
(a) Carbon is the element 'E' which exists in three allotropic forms A, B and C.
(b) Buckminsterfullerene is the allotrope, A, of carbon in which the atoms are joined to form spherical molecules.
(c) Graphite is the allotrope, B, of carbon which is surrounded by three other carbon atoms to form a sheet like structure.
(d) Diamond is the allotrope, C, of carbon in which each atom is surrounded by four other carbon atoms to form a rigid structure.
(e) The allotrope C (Diamond) is used to make jewellery.
(f) The allotrope B (Graphite) is used in making anode of a dry cell.
APPEARS IN
संबंधित प्रश्न
What type of bonds are present in hydrogen chloride and oxygen?
State one major difference between covalent and ionic bonds and give one example each of covalent and ionic compounds.
Give the formula of the compound that would be formed by the combination of the following pair of elements:
Al and Cl2
Give the formula of the compound that would be formed by the combination of the following pair of elements:
K and H
Using electron-dot diagrams which show only the outermost shell electrons, show how a molecule of nitrogen, N2, is formed from two nitrogen atoms. What name is given to this type of bonding? (Atomic number of nitrogen is 7)
Explain why, diamond can be used in rock drilling equipment but graphite cannot.
State one use of diamond which depends on its 'extraordinary brilliance' and one use of graphite which depends on its being 'black and quite soft'.
What is diamond? Of what substance is diamond made?
What is the difference between ionic compounds and covalent compounds?
Complete the following:
In case of non-polar covalent bond, the covalent bond is formed in the ______ of atoms and shared electrons are ______ distributed. (corner, middle, equally, unequally)
Match the pairs.
| Group 'A' | Group 'B' |
| a. C2H6 | 1. Unsaturated hydrocarbon |
| b. C2H2 | 2. Molecular formula of an alcohol |
| c. CH4O | 3. Saturated hydrocarbon |
| d. C3H6 | 4. Triple bond |
Explain the following term with example.
Covalent bond
Give examples for the following:
Two liquid non polar compounds.
Choose the correct answer from the options given below
Condition favorable for formation of a covalent bond is
The particles present in strong electrolytes are
State the type of bond formed when the combining atom has small E.N. difference.
Covalent bonds can be single, double or triple covalent bonds. How many electrons are shared in each? Give an example of each type.
Write scientific reason.
Carbon has the property of forming many compounds.
The correct structural formula of butanoic acid is -
Which of the following is the formula of Butanoic acid?
