Question

21. How many of the following molecules are polar covalent compound? coco: o doc negative charge cor - H₂O a) Four b) Zeroc) One d) Two e) Three 22. Ir a solid line represents a covalent bond and a dotted line represents intermolecular atùraction, which of these choices shows a hydrogen bond? a) - N H -0. b) H-H c) O...H-C- d) CH-F- Question 23-26: Indicate the major types of attractive force --- a). ionic bond, b) dipole- dipole attraction, c) dispersion forces, d) hydrogen bond ---- that occurs between particles of the following substances: 23. CaCl2 24. NH3 25. l 26. HBr 27. Which of the following arrangements is correct in terms of their boiling points? a) NF3 > HF > F2 b. He > CH4 > NH3 c. HCI > KCI > OCl d . H20 > SO2 > 02 Which of the following arrangements is correct in terms of their boiling points? 28. a) N2 > 02 > Cl2 > Br2 c) N2 <O2 < Br2 <Cl2 b) N2 <02 <Cl2 < Br2 c) O2 <N2 < Br< Cl2

Answer 1

21. Option D, two, CO and H2O are polar.

Ccl4 &Co2 are non polar.

22. Option A, since hydrogen bonds are formed between more Electronegativitve atoms like O,F,N and hydrogen which is attached to N,O or F.

23. Ionic bonds and Dipole-Dipole forces

24. Hydrogen bonds and dispersion forces

25. Dispersion forces

26. Hydrogen bonds and Dipole

27. Option D,

Since H2O:100°C> SO2(-10)> O2(-180°C)

28. Option B

Cl2----- 238K, N2: -195°C

Br2: 58°C and O2:-180°C