ThePrismSolutions

ThePrismSolutions

DAILY PRACTICE PAPER(15Th June 2018)

(1) The elements of symmetry in a crystal are-

(a) plane of symmetry     (b) axis of symmetry
(c) center of symmetry     (d) All

(2) A crystal may have one or more planes and one or more axes of symmetry but it possesses-

(a) Two centers of symmetry   (b) One centers of symmetry
(c) No center of symmetry    (d) None of these

(3) A binary solid (A+B-) has a rock salt structure.If the edge length is 400pm and the radius of cation is 75pm the radius of anion is-

(a) 100 pm    (b) 125 pm
(c) 250 pm    (d) 325 pm

(4) Each unit cell of NaCl consists of 4 chloride ions and-

(a) 13 Na atoms    (b) 4 Na ions
(c) 6 Na atoms    (d) 8 Na atoms

(5) In the unit cell of NaCl lattice there are-

(a) 3Na+ ions     (b) 6Na+ ions
(c) 6Cl- ions     (d) 4NaCl units



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