The sharp melting point of crystalline solids is due to….
a. A regular arrangement of constituent particles observed over a short distance in the crystal lattice
b. A regular arrangement of constituent particles observed over a long distance in the crystal lattice
c. Same arrangement of constituent particles in different directions
d. Different arrangement of constituent particles in different directions
Ans. b
Explanation : Crystalline solid has regular arrangement of constituent particles observed over a long distance in the crystal lattice. Due to this regular arrangement crystalline solid have sharp melting point.
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dm-3 sucrose solution at 20 ° C (molar gas constant, R = 8.314 JK -1 mol -1 ; 1 dm-3 = 0.001 m3 ) a. 4870 Pa b. 4.87 Pa c. 0.00487 Pa d. 0.33 Pa Ans. a (17)
