The formal charges of N(1), N(2) and O atoms in the following fig

Subject

Chemistry

Class

JEE Class 12

Test Series

Take Zigya Full and Sectional Test Series. Time it out for real assessment and get your results instantly.

Test Yourself

Practice and master your preparation for a specific topic or chapter. Check you scores at the end of the test.
Advertisement

 Multiple Choice QuestionsMultiple Choice Questions

1.

C6H6 + O3 → X Zn/ H2O Y; X and Y are respectively.

  • diozonide, glycol

  • triozonide, glyoxalic acid

  • triozonide, glyoxal

  • monoozonide, oxalic acid


2.

If the equilibrium constant for the reaction,

2AB  A2 + B2 

is 49, what is the equilibrium constant for AB  12A1 + 12A2 ? 

  • 7

  • 17

  • 24.5

  • 49


3.

The pH of 0.05 M acetic acid is Ka = 2 × 10-5)

  • 2

  • 11

  • 10-3

  • 3


4.

What is the entropy change in JK-1 during the melting of 27.3 g of ice at 0°C? (Latent heat of fusion of ice = 330 Jg-1)

  • 330

  • 12.1

  • 3.3

  • 33


Advertisement
5.

Identify the order in which the spin only magnetic moment (in BM) increases for the following four ions

(I) Fe2+

(II) Ti2+

(III) Cu2+

(IV) V2+

  • I, II, IV, III

  • IV, I, II, III

  • III, IV, I, II

  • III, II, IV, I


6.

Which one of the following frequencies of radiation (in Hz) has a wavelength of 600 nm?

  • 2.0 × 1013 

  • 5.0 × 1016 

  • 2.0 × 1014 

  • 5.0 × 1014 


7.

According to Bohr's theory which one of the following values of angular momentum of hydrogen atom is not permitted?

  • 1.25 hπ

  • hπ

  • 1.5  hπ

  • 0.5 hπ


8.

Which one of the following is correct order of second ionisation potential of Na, Ne, Mg and Al?

  • Al < Na < Mg < Ne

  • Ne < Al < Na < Mg

  • Mg < Al < Ne < Na

  • Na < Mg < Ne < Al


Advertisement
Advertisement

9.

The formal charges of N(1), N(2) and O atoms in the following figure are respectively

  • +1, -1, 0

  • -1, +1, 0

  • +1, +1, 0

  • -1, -1, 0


B.

-1, +1, 0

Formal charge = [Total number of valence electrons in the free atom] - [ Total number of non-bonding (lone pairs) electrons] -12 [Total number of bonding electrons]

In, the above given figure, the formal charge on

(i) the end of N atom marked 1

= 5 - 4 - 12(4)

= 5 - 4 - 2 = -1

(ii) the central N atom marked 2,

= 5 - 0 - 12(8)

= 5 - 4 = +1

(iii) the end O atom,

= 6 - 4 - 12(4)

= 6 - 6 = 0


Advertisement
10.

In which of the following pairs, the central atoms have the same number of lone pairs of electrons?

  • PCl5, BrF5

  • XeF2, ICl

  • XeF4, ClO4-

  • SCl4, CH4


Advertisement