Please select a subject first
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Cations are present in the interstitial sites in ______.
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Schottky defect is observed in crystals when ______.
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Which of the following point defects are shown by AgBr(s) crystals?
- Schottky defect
- Frenkel defect
- Metal excess defect
- Metal deficiency defect
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Which of the following defects is also known as dislocation defect?
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Which of the following statements are not true?
(i) Vacancy defect results in a decrease in the density of the substance.
(ii) Interstitial defects results in an increase in the density of the substance.
(iii) Impurity defect has no effect on the density of the substance.
(iv) Frankel defect results in an increase in the density of the substance.
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Frenkel defect is also known as:
(i) stoichiometric defect
(ii) dislocation defect
(iii) impurity defect
(iv) non-stoichiometric defect
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Which of the following defects decrease the density?
(i) Interstitial defect
(ii) Vacancy defect
(iii) Frankel defect
(iv) Schottky defect
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Why is FeO (s) not formed in stoichiometric composition?
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Match the defects given in Column I with the statements in given Column II.
| Column I | Column II |
| (i) Simple vacancy defect | (a) shown by non-ionic solids and increases density of the solid. |
| (ii) Simple interstitial defect | (b) shown by ionic solids and decreases density of the solid. |
| (iii) Frenkel defect | (c) shown by non ionic solids and density of the solid decreases. |
| (iv) Schottky defect | (d) shown by ionic solids and density of the solid remains the same. |
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The unit of ebulioscopic constant is ______.
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Explain why on addition of 1 mol of NaCl to 1 litre of water, the boiling point of water increases, while addition of 1 mol of methyl alcohol to one litre of water decreases its boiling point.
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Why is it not possible to obtain pure ethanol by fractional distillation? What general name is given to binary mixtures which show deviation from Raoult’s law and whose components cannot be separated by fractional distillation. How many types of such mixtures are there?
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While charging the lead storage battery ______.
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How will you distinguish between dispersed phase and dispersion medium in an emulsion?
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Match the items of Column I with items of Column II and assign the correct code:
| Column I | Column II |
| (A) Blisterred Cu | (1) Aluminium |
| (B) Blast furnace | (2) \[\ce{2Cu2O + Cu2S -> 6Cu + SO2}\] |
| (C) Reverberatory furnace | (3) Iron |
| (D) Hall-Heroult process | (4) \[\ce{FeO + SiO2 -> FeSiO3}\] |
| (5) \[\ce{2Cu2S + 3O2 -> 2Cu2O + 2SO2}\] |
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Chloromethane on treatment with excess of ammonia yields mainly ______.
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Why iodoform has appreciable antiseptic property?
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Name the alkene which will yield 1-chloro-1-methylcyclohexane by its reaction with \[\ce{HCl}\]. Write the reactions involved.
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Diphenyls are potential threat to the environment. How are these produced from arylhalides?
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What are the IUPAC names of the insecticide DDT and benzene hexachloride? Why is their use banned in India and other countries?
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