Which of the following has the highest bond order? from Chemistr

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.

Which of the following represents the Lewis structure of N2 molecule?


2.

The decomposition of a certain mass of CaCO3 gave 11.2 dm3 of CO2 gas at STP. The mass of KOH required to completely neutralise the gas is :

  • 56 g

  • 28 g

  • 42 g

  • 20 g


3.

The density of a gas is 1.964 g dm-3 at 273 K and 76 cm Hg. The gas is :

  • CH4

  • C2H6

  • CO2

  • Xe


4.

0.06 mole of KNO3 solid is added to 100 cm3 of water at 298K. The enthalpy of KNO3 aqueous solution is 35.8 kJ mol-1. After the solute is dissolved the temperature of the solution will be:

  • 293 K

  • 298 K

  • 301 K

  • 304 K


Advertisement
5.

4 moles each of SO2 and Ogases are allowed to react to form SO3, in a closed vessel. At equilibrium 25% of O2 is used up. The total number of moles of all the gases at equilibrium is :

  • 6.5

  • 7.0

  • 8.0

  • 2.0


6.

ΔG° vs T plot in the Ellingham's diagram slopes upwards for the reactions:

  • Mg+ 1/2O2 → MgO

  • 2Ag + 1/2O2 → Ag2O

  • C + 1/2O2 → CO

  • CO + 1/2O2 → CO2


Advertisement

7.

Which of the following has the highest bond order?

  • N2

  • O2

  • He2

  • H2


A.

N2

Molecular orbital configuration ofN2 = 14e-= σ1s2, σ*1s2, σ2s2, σ*2s2,σ2px2, π2py2, π2pz2Bond order =Nb- Na2= 10-42=3similarly for O2 molecule, bond order = 2For He2 molecule, bond order = 0For H2 molecule bond oeder = 1So, N2 has highest bond order.


Advertisement
8.

Which of the following is diamagnetic?

  • H2+

  • O2

  • Li2

  • He2+


Advertisement
9.

Solubility product of a salt AB is 1 x 10-8 M2 in a solution in which the concentration of A+ ions is 10M.The salt will precipitate when the concentration of B ions is kept :

  • between 10-8 M to 10-7 M

  • between 10-7 M to 10-8 M

  • >10-5 M

  • <10-8 M


10.

The pH of 10-8 M HCl solution is:

  • 8

  • more than 8

  • between 6 and 7

  • slightly more than 7


Advertisement