Practice Test for 10+2 Board Examination- Chemistry

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Maharishi Markandeshwar (Deemed to be University) Mullana-Ambala, Haryana

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Which one of the following is non-crystalline or amorphous?

1 point

(a) Diamond

(b) Graphite

(d) Common Salt

Clear selection

NaCl type crystal (with coordination no. 6 : 6) can be converted into CsCl type crystal (with coordination no. 8 : 8) by applying

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(a) high temperature

(b) high pressure

(d) low temperature and low pressure

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How many chloride ions are surrounding sodium ion in sodium chloride crystal ?

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(a) 4

(b) 8

(d) 12

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In NaCl structure

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(a) all octahedral and tetrahedral sites are occupied

(b) only octahedral sites are occupied

(d) neither octahedral nor tetrahedral sites are occupied

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In Zinc blende structure

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(a) zinc ions occupy half of the tetrahedral sites

(b) each Zn2- ion is surrounded by six sulphide ions

(d) it has fee structure

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A unit cell of BaCl2 (fluorite structure) is made up of

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(a) four Ba2+ ions and four Cl– ions

(b) four Ba2- ions and eight Cl– ions

(d) four Ba² ions and six Cl– ions

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Alkali halids do not show Frenkel defect because

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(a) cations and anions have almost equal size

(b) there is a large difference in size of cations and anions

(d) anions cannot be accommodated in voids

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The coordination number of Y will be in the XY types of crystal:

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(a) 6

(b) 8

(d) 4

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The fraction of the total volume occupied by the atoms present in a simple cube

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(a) π4

(b) π6

is (d) π4√2

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Edge length of unit cell of chromium metal is 287 pm with bcc arrangement. The atomic radius is of the order

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(a) 287 pm

(b) 574 pm

(d) 143.5 pm

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The edge length of fee cell is 508 pm. If radius of cation is 110 pm, the radius of anion is

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(a) 110 pm

(b) 220 pm

(d) 144 pm

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The density of a metal which crystallises in bcc lattice with unit cell edge length 300 pm and molar mass 50 g mol-1 will be

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(a) 10 g cm-3

(b) 14.2 g cm-3

(d) 9.3 2 g cm-3

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How many lithium atoms are present in a unit cell with edge length 3.5 Å and density 0.53 g cm-3? (Atomic mass of Li = 6.94):

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(a) 2

(b) 1

(d) 6

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The distance between Na– and CL– ions in NaCl with a density 2.165 g cm-3 is

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(a) 564 pm

(b) 282 pm

(d) 538 pm

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An element with atomic mass 100 has a bcc structure and edge length 400 pm. The density of element is

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(a) 10.37 g cm-3

(b) 5.19 g cm-3

(d) 2.14 g cm-3

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Fe3O4 (magnetite) is an example of

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(a) normal spinel structure

(b) inverse spinel structure

(d) anti fluorite structure

Clear selection

Which of the following crystals does not exhibit Frenkel defect?

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(a) AgBr

(b) AgCl

(d) ZnS

Clear selection

What type of stoichiometric defect is shown by ZnS?

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(a) Schottky defect

(b) Frenkel defect

(d) Non-stoichiometric defect

Clear selection

Silver halides generally show

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(a) Schottky defect

(b) Frenkel defect

(d) cation excess defect

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Which of the following will have metal deficiency defect?

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(a) NaCl

(b) FeO

(d) ZnO

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In which pair most efficient packing is present?

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(a) hep and bcc

(b) hep and ccp

(d) bcc and simple cubic cell

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What is the effect of Frenkel defect on the density of ionic solids?

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The density of the crystal increases

(b) The density of the crystal decreases

(d) There is no relationship between density of a crystal and defect present in it

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In a Schottky defect

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(a) an ion moves to interstitial position between the lattice points

(b) electrons are trapped in a lattice site

(d) some extra cations are present in interstitial space

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Which of the following conditions favours the existence of a substance in the solid state?

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(a) High temperature

(b) Low temperature

(d) Weak cohesive forces

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Which of the following statements about amorphous solids is incorrect ?

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(a) They melt over a range of temperature

(b) They are anisotropic

(d) They are rigid and incompressible

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Which of the following statement is not true about amorphous solids ?

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(a) On heating they may become crystalline at certain temperature.

(b) They may become crystalline on keeping for long time

(d) They are anisotropic in nature.

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Which of the following is not a characteristic property of solids?

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(a) Intermolecular distances are short

(b) Intermolecular forces are weak.

(d) Solids oscillate about their mean positions.

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Most crystals show good cleavage because their atoms, ions or molecules are

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(a) weakly bonded together

(b) strongly bonded together

(d) arranged in planes

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A crystalline solid

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(a) changes abruptly from solid to liquid when heated

(b) has no definite melting point

(d) has an irregular 3-dimensional arrangements

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In Zinc blende structure

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(a) zinc ions occupy half of the tetrahedral sites

(b) each Zn2- ion is surrounded by six sulphide ions

(d) it has fee structure

Clear selection

Disclaimer: The set of questions aimed for the preparation of students appearing in 10+2 board exams. Questions have been compiled using open access online sources.

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