general chemistry , please solve question 18 and 19 1A.Asimate the but of roaction (A0 at 208 K Ror the reaction shown, given the average bond enorgies below.Brg)+3F(g)-Bel(g)he bond cnergies of Br-Br 192 kmol, F-F 158 K/mol, Br-F-197 kimol](b)-410 kJ(e)-611 kJ(d)-665 kJ(e)-720 kJ13. Which one of the following violates the octet rule?(a) PCh(b) CBra(e) NF(d) OF(e) PCls14. The correct Lewis structure for nitrogen trichloride has:(a) 3 N-CI bonds and a total of 10 lone pairs of electrons.(b) 3 N-CI bonds and a total of 6 lone pairs of elecetrons.(e)I N-CI bond, 2 N-Cl bonds and 7 and a total of lone pairs of electrons,(d) 2 N-CI bonds, 1 N-CI bond and a total of 8 lone pairs of electrons.(e) 3 N-CI bonds and a total of 9 lone pairs of electrons.15. Consider hydrogen carbonate ion (HCO,). After drawing the correct Lewis structure(s), you would see:(b) three single bonds around the central carbon atom,(a) two double bonds around the central carbon atom.(c) four single bonds around the central carbon atom.(d) two equivalent resonance forms.(e) three equivalent resonance forms.16. Which of these isoelectronic species has the smallest radius?(b) Sr*(c) Rb*(d) Se(a) Br(e) They are all the same radius because they have the same number of electrons,17. A neutral molecule having the general formula AB, has one lone pairs of electrons on A. What is the hybridizationof A?(b) sp(c) sp'(d) sp'd(e) sp'd(a) sp18. Which of the following four molecules are polar: PH3, OF2, HF, SO,?(a) all except SO;(b) only HF(c) only HF and OF2(d) none of them(e) all of them19. The perchloric acid (HCIO,) molecule contains:(a) 13 lone pairs, 1a bond, and 4 a bonds.(c) 8 lone pairs, 3 n bonds, and 5 o bonds.(e) 11 lone pairs, no a bonds, and 5 o bonds.(b) 9 lone pairs, no z bonds, and 6 o bonds.(d) 2 lone pairs, 3 n bonds, and 4 o bonds.20. Which of the following molecular geometries is WRONG?(a) NF3 - trigonal planar(d) AsFs - trigonal bipyramidal(c) BF, - trigonal planar(b) H2O-bent(e) SeF. - octahedral2

Q18) PH3 is a polar compound due to the presence of one lone pair of electrons and because…

18. Which of the following four molecules are polar: PH3, OF2, HF, SO,? (a) all except SO, (b) only HF (c) only HF and OF2 (d) none of them (e) all of them 19. The perchloric acid (HCIO,) molecule contains: (a) 13 lone pairs, 1 a bond, and 4 o bonds. (c) 8 lone pairs, 3 n bonds, and 5 o bonds. (e) 11 lone pairs, no a bonds, and 5 o bonds. (b) 9 lone pairs, no a bonds, and 6 o bonds. (d) 2 lone pairs, 3 n bonds, and 4 o bonds.

18. Which of the following four molecules are polar: PH3, OF2, HF, SO,? (a) all except SO, (b) only HF (c) only HF and OF2 (d) none of them (e) all of them 19. The perchloric acid (HCIO,) molecule contains: (a) 13 lone pairs, 1 a bond, and 4 o bonds. (c) 8 lone pairs, 3 n bonds, and 5 o bonds. (e) 11 lone pairs, no a bonds, and 5 o bonds. (b) 9 lone pairs, no a bonds, and 6 o bonds. (d) 2 lone pairs, 3 n bonds, and 4 o bonds.

Chemistry for Engineering Students

4th Edition

ISBN:9781337398909

Author:Lawrence S. Brown, Tom Holme

Publisher:Lawrence S. Brown, Tom Holme

Chapter9: Energy And Chemistry

Section: Chapter Questions

Problem 9.101PAE

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