61. Which of the following is NOT the order of increasing ionic radius? 62. The

Question

61. Which of the following is NOT the order of increasing ionic radius? 62. The radii of the species X, X and X decrease in the following order ?-?.-X. ?-?-?. a. b. 63. How many electrons does a stable nitride ion have? a. 5 C. 8 d. 9 e. 10 64. All of the following represent stable positive ions EXCEPT? a. Ba b. Ga ?.Na. d. Ca 65. An element X from Group IA reacts with Y to form Group VA. Which is true concerning the elements or compound? a. b. c. X is a nonmetal Y is a metal The compound's formula is XiY2 d. The compound would be covalent Elemental properties are preserved in the e. 66. The formulas of the nitrite, nitride and nitrate lons are represented respectively as a. NO2, NO, NO. b. N, NO2, NO e. No,, N02., N. d. NO2, N, NO 67. In which of the lists below are all of the formulas correct? C. NH4, CauNa, CaO d. Na:504, K,50), CsS e. HCO, Ca(NO, SO 68. Which of these compounds have the greatest ionic character? e. CF a. CLF b. IF c. CsF 69. In which of the following is there both ionic and covalent bonding? c. Ba(CIO e. All of these d. Ca(NO)z b. Ba(CIO)2 Which compounds contain only ionic bonding? 70. e. MgCO c. CSNO d. LiBr a. NaCN

Explanation / Answer

61)

Isoelectronic species with increasing atomic number have decreasing radii - D

62)

The anion of an element has a larger radius than the element with no charge which in turn has less radius than cation of the element - D

63)

N3- has 10 electrons with superoctet configuration - E

64)

Ca2+ is stable form - D

65)

Using criss-cross method we get X 3Y2 - C

66)

D

67)

B

68)

CsF has greatest ionic character due to the huge difference in electronegativity - C

69)

E

70)

LiBr since it is made of only two elements which are greatly different in electronegativities - D

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