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 the element E is surrounded by three other E atoms to form a sheet like structure. In allotrope C, each atom of the element E is surrounded by four other E atoms to form a rigid structure.(a) Name the element E.
(b) What is the allotrope A?
(c) What is the allotrope B?
(d) What is the allotrope C?
(e) Which allotrope is used in making jewellery?
(f) Which allotrope is used in making anode of a dry cell?
(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) Allotrope B is Graphite as it forms a sheet-like structure.
(d) Allotrope C is Diamond as it forms a rigid structure.
(e) Allotrope C that is Diamond is used in making jewellery.
(f) Allotrope B that is Graphite is used in making anode of a dry cell.
Related Articles
- 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 utilized by plants in photosynthesis. An allotrope C of this element is used as 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.
- 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.
- Name a non-metal :(a) which is lustrous(b) which is required for combustion(c) whose one of the allotrophic forms is a good conductor of electricity. Name the allotrope.(d) other than carbon which shows allotropy(e) which is known to form the largest number of compounds
- An atom of element E contains 3 protons, 3 electrons and 4 neutrons :(a) What is its atomic number?(b) What is its mass number?(c) Write the electronic configuration of the element E.(d) State whether element E is a metal or non-metal. Why?(e) What type of ion, cation or anion, will be formed by an atom of element E? Why?(f) Write the symbol of the ion formed by an atom of element E.(g) What could element X be?
- The person A has only B chromosomes in all its gametes. On the other hand, another person C has chromosome D in half of gametes and chromosome E in the other half of gametes. When chromosomes B and D combine during fertilisation, a female zygote results. On the other hand, combination of B and E chromosomes produces a male zygote.(a) What are chromosomes (i) B (ii) D, and (iii) E? (b) Out of B, D and E, which two chromosomes are of the same type? (c) Which chromosome is smaller in size? (d) What is the general name of chromosomes such as B and E? (e) Out of the two persons A and C, which one is (i) male, and (ii) female?
- Gas A, which is the major cause of global warming, combines with hydrogen oxide B in nature in the presence of an environmental factor C and a green material D to form a six carbon organic compound E and a gas F. The gas F is necessary for breathing.(a) What is gas A?(b) What is the common name of B?(c) What do you think could be C?(d) What is material D? Where is it found?(e) Name the organic compound E.(f) What is gas F? Name the natural process during which it is released.
- Non-metals are usually poor conductors of heat and electricity. They are non-lustrous, non-sonorous, non-malleable and are colored.(a) Name a lustrous non-metal.(b) Name a non-metal which exists as a liquid at room temperature.(c) The allotropic form of a non-metal is a good conductor of electricity. Name the allotrope.(d) Name a non-metal which is known to form the largest number of compounds.(e) Name a non-metal other than carbon which shows allotropy.(f) Name a non-metal which is required for combustion.
- Write the property: $( \frac{a}{b}+\frac{c}{d})+\frac{e}{f}=\frac{a}{b}+( \frac{c}{d}+\frac{e}{f})$.
- What is the stimulus in : (a) phototropism ? (b) geotropism ? (c) chemotropism ? (d) hydrotropism ? (e) thigmotropism ?
- The electronic configuration of an element Z is 2, 8, 8.(a) What is the atomic number of the element?(b) State whether element Z is a metal or a non-metal.(c) What type of ion (if any) will be formed by an atom of element Z? Why?(d) What is special about the outermost electron shell of the atom of this element?(e) Give the name and symbol of element Z.(f) Name the group of elements to which Z belongs.
- The atom of an element X has 7 electrons in its M shell.(a) Write the electronic configuration of element X.(b) What is the atomic number of element X?(c) Is it a metal or a non-metal?(d) What type of ion will be formed by an atom of element X? Write the symbol of the ion formed.(e) What could element X be?
- The symbol of a metal element which is used in making thermometers is :(a) Ag (b) Hg(c) Mg (d) Sg
- What is the atomicity of the following?(a) Oxygen (b) Ozone (c) Neon (d) Sulphur (e) Phosphorus (f) Sodium
- Every household produces a lot of material A daily. In one of the methods of disposal B, material A is burned at a very high temperature of about 1000°C in a structure called C. During this process, the organic matter present is removed as D and E whereas F is left behind (which can be dumped in a landfill site).(a) What is material A?(b) Name the method of disposal B.(c) What is structure C known as?(d) What are (i) D (ii) E, and (iii) F?(e) This method is especially suitable for the disposal of materials produced by certain institutions. Name such institutions.
Kickstart Your Career
Get certified by completing the course
Get Started