St. Britto Hr. Sec. School - Madurai
12th Chemistry Monthly Test - 2 ( Solid State )-Aug 2020
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What is point defect in crystals?
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What are primitive unit cells?
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A compound made up of two atoms X and Y has a face centred cubic arrangement. X is present in the coners and Y at the centre of each face. If one atom is missing from comer. What is the simplest formula of the compound.
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Distinguish between.
Face - centred and body - centred unit cells. -
classify the following solids
a. P4
b. Brass
c. diamond
d. NaCl
e. Iodine
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The energy required to vapourize one mole of copper is smaller than that of energy required to vapourise 1 mole of diamond why?
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Why is FeS not formed in stoichiometric composition?
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Distinguish between cubic and hexagonal unit cells.
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Define the term amorphous.
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What is coordination number?
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An atom crystallizes in fcc crystal lattice and has,a density of 10 g cm-3 with unit cell edge length of I00pm. Calculate the number of atoms present in 1g of crystal.
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Name the seven primitive crystal systems.
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Distinguish between hexagonal close packing and cubic close packing.
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Ionic solids conduct electricity in molten state but not in solid state. Explain.
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Aluminium crystallises in a fee structure. Atomic radius of the metal is 125 pm. What is the length of the side of the unit cell of the metal?
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Give any three characteristics of ionic crystals.
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Which point effect in crystal doesn't alter the density of the relevant solid?
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Distinguish tetrahedral and octahedral voids.
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Aluminium crystallizes in a cubic close packed structure. Its metallic radius is 125pm. calculate the edge length of unit cell.
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How are crystals classified?
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What are molecular solids? Explain the types of molecular solids.
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What are the general characteristics of solids?
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Explain the following:
Similarities and differences between metallic and ionic crystals. -
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Ionic solids, which have anionic vacancies due to metal excess defect, develop colour. Explain with the help of a suitable example.
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Sodium metal crystallizes in bcc structure with the edge length of the unit cell 4.3X108.cm. calculate the radius of sodium atom.
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How can you determine the atomic mass of an unknown metal if you know its density and the dimension of its unit cell? Explain.
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What is meant by the term “coordination number”? What is the coordination number of atoms in a bcc structure?
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Write a note on Frenkel defect.
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An element has bcc structure with a cell edge of 288 pm. the density of the element is 7.2 gcm-3. how many atoms are present in 208g of the element.