34. A solid has a very high melting point, is hard, and as a liquid it is a cond

Question

34. A solid has a very high melting point, is hard, and as a liquid it is a conductor. The solid is a, a molecular solid. b. a metallic solid. c. a covalent network solid. d. an ionic solid. e, an amorphous solid 35. All the following are covalent network solids ExCEPT a. silicon carbide b. quartz. d. diamond. e. graphite. 36. Which of the following as a SOLID has a crystal structure containing DISCRETE (or separate) molecules? a. Naci b. CH4 c. C(graphite) d. C(diamond) e. SiO2 37. Which of the following would best be classified as an ionic solid? 1. Na(s) 2. CsF(s) 3. CO20s) a. 1 only b, 2 only c. 3 only d. 1 and 2 only e. 2 and 3 only would be expected to have the highest melting point and the 38. Of the following, highest crystal lattice energy. b. KF c. NaCl d. NaF e. Nal 39. Which of the following compounds would be expected to have the HIGHEST melting point? a. PeO6

Explanation / Answer

34) d) an ionic solid , because these properties are satisfied by ionic solids. they are non conducting is solid phase while conducting in liquid phase.

35) C) Iron do not have covelent network, while silicon carboide , quartz , diamond and graphite has covelent network.

36) B) CH4

37) B) 2 only.

38) d. NaF

Melting point - 993 degree celcius

Lattice energy - 923 Units.

39) d. CaO , 2572 degree celcius.

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