Question

b) 2 13- How many electron domains are around N in No, ion? a) 3 c) 4 d) 1 14- Which of the following Lewis structures for NO* ion is acceptable? a) [:N-ö:]+ b) [:N-5:]+ c) [:N=0:1+ d) [:N=0:1+ I 15- What of the following shows the correct Lewis symbol of Tellurium, Te? a) Te. b):ře c) Te. d) te. 16- At 870 mm Hg, a sample of gas takes up 4.25L at 25°C. If the pressure in the gas is increased to 2.40 atm at 25 °C, what will the new volume be? a) 400 L b) 2.03 L c) 8.50 L d)1541 L 17- How many o bonds and TT bonds are in following molecule? & $ 4 2 C 3 % 5 6 00 * 7 9 0 W E R T Y U 0 S D F G H J к

Answer 1

Solution:

13. The number of lone pairs or bond locations around a particular atom in a molecule are called electron domain or electron groups.

N atom in NO₃^- ion is is having 1 N=O, 2 N-O, having no unpaired electrons. Therefore, 3 electron domains are around N in  NO₃^- ion.

Hence, option " a) 3 " is correct.

14. Lewis structure NO⁺ ion:

The Lewis structure that satisfy the octet rule are greater contributors than the structures which do not satisfy.

Overall charge of all the Lewis structure is 1+. However, in structure

a) & b). Both N & O has only 6 electrons.

c). Both N & O has only 8 electrons.

d). Both N & O has only 10 electrons.

Hence, the option " c) " is correct.

15. Lewis symbol of Te:

Electron configuration of Te is [Kr]5s²5p⁴

The outer most shell has 2 paired electrons, each in 5s & 5p_x, 2 unpaired electrons 1 each in 5p_y & 5p_z.

Hence, option " c) " is correct.

16.

For comparing the same substance under two different sets of conditions, the Boyle's law can be usefully expressed as:

P₁V₁ = P₂V₂ ---> (1)

P₁ = 870 mmHg x (1 atm / 760 mmHg) = 1.1447 atm

P₂ = 2.40 atm

V₁ = 4.25 L

Plug the values in (1) and solve for V₂.

V₂ = (1.1447 atm x 4.25 L) / 2.40 atm = 2.03 L

Hence, option " b) 2.03 L " is correct.