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Carborundum is...

Carborundum is

A

molecular solid

B

covalent solid

C

ionic solid

D

amorphours solid

Text Solution

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The correct Answer is:
B
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What is carborundum ?

Le Chatelier's Principle If a system at equilibrium is subjected to a change of any one of the factors such as concentration, pressure or temperature, the system adjusts itself in such a way as to nullify the effect of that change. Change of pressure : If a system consists of gases, then the concentration of all the components can be alterd by changing the pressure. To increase the pressure on the system,the volume has to be decreased proportionally. The total number of mols per unit volume will now be more and the equilibrium will shift in the direction in which there is a decrease in number of moles i,e. towards the direction in which there can be decrease in pressure. Effect of pressure on melting point : There are two types of solids: (a) Solids whose volume decreases on melting e.g., ice,diamond carborundum magnesium nitride and quratz. Solids (higher volume) hArr Liquid (lower volume) The process of melting is facilitated at high pressure, thus, melting point is lowerd. (b) Solids whose volume increase on melting e.g.,Fe,Cu,Ag,Au,etc. Solid (lower volume) hArr Liquid (higher volume) In this case the process of melting become difficult at high pressure, thus melting point becomes high. (c) Solubility of substances : When solid substances are dissolved in water, either heat is evolved (exothermic) or heat is absorbed (endothermic). KCI+aqhArrKCI(aq)-heat In such cases, solubility increase with increase in temperature. Consider the case of KOH, when this is dissolved,heat is evolved. KOH+aqhArrKOH(aq)+heat In such cases, solubility decrease with increase in temperature. (d) Solubility of gases in liquids : When a gas dissolves in liquid,there is decrease in volume. Thus increase of pressure will favour the dissolution of gas in liquid. A gas 'X' when dissolved in water,heat is evolved. Then solubility of 'X' will increase:

Le Chatelier's Principle If a system at equilibrium is subjected to a change of any one of the factors such as concentration, pressure or temperature, the system adjusts itself in such a way as to nullify the effect of that change. Change of pressure : If a system consists of gases, then the concentration of all the components can be alterd by changing the pressure. To increase the pressure on the system,the volume has to be decreased proportionally. The total number of mols per unit volume will now be more and the equilibrium will shift in the direction in which there is a decrease in number of moles i,e. towards the direction in which there can be decrease in pressure. Effect of pressure on melting point : There are two types of solids: (a) Solids whose volume decreases on melting e.g., ice,diamond carborundum magnesium nitride and quratz. Solids (higher volume) hArr Liquid (lower volume) The process of melting is facilitated at high pressure, thus, melting point is lowerd. (b) Solids whose volume increase on melting e.g.,Fe,Cu,Ag,Au,etc. Solid (lower volume) hArr Liquid (higher volume) In this case the process of melting become difficult at high pressure, thus melting point becomes high. (c) Solubility of substances : When solid substances are dissolved in water, either heat is evolved (exothermic) or heat is absorbed (endothermic). KCI+aqhArrKCI(aq)-heat In such cases, solubility increase with increase in temperature. Consider the case of KOH, when this is dissolved,heat is evolved. KOH+aqhArrKOH(aq)+heat In such cases, solubility decrease with increase in temperature. (d) Solubility of gases in liquids : When a gas dissolves in liquid,there is decrease in volume. Thus increase of pressure will favour the dissolution of gas in liquid. Au(s) hArr Au(l) Above equsilibrium is favoured at :

RESONANCE ENGLISH-SOLID STATE-Part-II National standard examination in chemistry
  1. An element crystallises in a faces centered cubic lattice. Hence, its ...

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  2. Arsenic is used to dope germanium to obtain

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  3. Carborundum is

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  4. Assertion (A) : Graphite is an example of tetragonal crystal system. ...

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  5. The number of units cells in 17.0 grams of NaCl is approximately

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  6. In the unit cell of the crystal formed by the ionic compound of X and ...

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  7. How many nearest neighbours surround each ion in a face-centered cubic...

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  8. Match box exhibits:

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  9. The simplest formula of a compound containing 50% of element X ("atomi...

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  10. For a face centered cubic lattaice, the unit cell content is

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  11. Body centred cubic lattice has a coordination number of

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  12. Which of the following primitive cells show the given parameters ? a...

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  13. What are the number of atoms per unit cell and the number of nearest n...

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  14. Ionic salt AX grows in face centered cubic lattice with cell length 'a...

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  15. The unit cell of a compound made up of the three elements X, Y and Z i...

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  16. The metal M crystallizes in a body centered lattice with cell edge. 40...

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  17. Ice crystallizes in a hexagonal lattice. At ascertain low temperature,...

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  18. One mole crystal of a metal halide of the type MX with molecular weigh...

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  19. An ionic solid "Lal"(2) shown electrical conduction due to presence of

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  20. In a cubic crystal structure, divalent metal-ion is located at the bod...

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