Multiple choice

Of the molecules below, the bond in ____ is the most polar. A) HBr B) HI C) HCl D) HF E) H_2 The C = O bond in COCl_2 can be described as A) a sigma bond and a pi bond, both involving sp hybrid orbitals on C. B) a sigma bond involving an sp hybrid orbital on C and a pi bond involving a p orbital on C. C) a sigma bond and a pi bond, both involving sp^2 hybrid orbitals on C. D) a sigma bond involving an sp^2 hybrid orbital on C and a pi bond involving a p orbital on C The electron configuration belonging to the atom with the highest ionization energy is ____. A) 1s^2 2s^2 2p^6 3s^1 B) 1s^2 2s^2 2p^6 3s^1 C) 1s^2 2s^2 2p^6 3s^2 3p^1 D) 1s^2 2s^2 2p^6 3s^2 3p^4 E) 1s^2 2s^2 2p^6 3s^2 3p^5 Which isoelectronic series is correctly arranged in order of increasing radius? A) K^+ < Ca^2+ < Ar < Cl^- B) Cl^- < Ar < K^+ < Ca^2+ C) Ca^2+ < Ar < K^+ < Cl^- D) Ca^2+ < K^+ < Ar < Cl^- E) Ca^2+ < K^+ < Cl^- < Ar Which of the following correctly represents the electron affinity of bromine? A) Br(g) rightarrow Br^+(g) + e^- B) Br(g)+ e^- rightarrow Br^-(g) C) Br_2 (g) + e^- rightarrow Br^- (g) D) Br_2 (g) + 2e^- rightarrow 2Br^- (g) E) Br^- (g) + e^- rightarrow Br (g)

Of the molecules below, the bond in ____ is the most polar. A) HBr B) HI C) HCl D) HF E) H_2 The C = O bond in COCl_2 can be described as A) a sigma bond and a pi bond, both involving sp hybrid orbitals on C. B) a sigma bond involving an sp hybrid orbital on C and a pi bond involving a p orbital on C. C) a sigma bond and a pi bond, both involving sp^2 hybrid orbitals on C. D) a sigma bond involving an sp^2 hybrid orbital on C and a pi bond involving a p orbital on C The electron configuration belonging to the atom with the highest ionization energy is ____. A) 1s^2 2s^2 2p^6 3s^1 B) 1s^2 2s^2 2p^6 3s^1 C) 1s^2 2s^2 2p^6 3s^2 3p^1 D) 1s^2 2s^2 2p^6 3s^2 3p^4 E) 1s^2 2s^2 2p^6 3s^2 3p^5 Which isoelectronic series is correctly arranged in order of increasing radius? A) K^+
## Answer

11) Polarity of a bond is directly proportional to the
electronegativity difference between the constituent atoms. Here
electronegativity difference is higher for HF
**Answer D) HF**
12) Carbon on COCl_{2} is sp2 hybridized. The double
bond involves one sigma bond and one pi bond
**Answer C) A bond and a bond, both involving
sp**^{2} hybrid orbitals on C
13) Here, among the provided, the highest ionization energy is
shown by Chlorine
**Answer E) 1s**^{2} 2s^{2} 2p^{6}
3s^{2} 3p^{5}
14) Here, Cl^{–} will have highest radius and
Ca^{2+} will have lowest radius
**Answer D) Ca**^{2+} < K^{+} < Ar
< Cl^{–}
15) Electron affinity can be defined as the energy released when
an isolated gaseous atom accepts an electron.

**Answer B) Br (g) +
e**^{–}
Br^{–} (g)