The decomposition of a certain mass of CaCO3 gave 11.2 dm3 o

Subject

Chemistry

Class

JEE Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

1.

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


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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


B.

28 g

weight of 11.2dm3 of CO2 gas at STP= 44/2 = 22g.KOH +CO2  KHCO3KOH required for complete neturalisation requires of 22g of CO2 is =5644×22 = 28g


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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


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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


7.

Which of the following has the highest bond order?

  • N2

  • O2

  • He2

  • H2


8.

Which of the following is diamagnetic?

  • H2+

  • O2

  • Li2

  • He2+


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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


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