Which of the following is not a equilibrium ? from Chemistry JEE

Subject

Chemistry

Class

JEE Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

1.

Which of the following sets of qunatum numbers correct?

  • n =5, l=4, m=0, s=+1/2

  • n= 3, l=3, m=+3, s= +1/2

  • n=6, l=0, m=+1, s= =1/2

  • n=4, l= 2, m=+2, s=0


2.

Which of the following behaves as Lewis acid and not as Bronsted acid ?

  • HCl

  • H2SO4

  • HSO3-

  • SO3


3.

The pair of elements having approximately equal ionisation potential is

  • Al, Ga

  • Al, Si

  • Al, Mg

  • Al, B


4.

Water is well known amphoprotic solvent. In which chemical reaction water is behaving as a base?

  • H2SO4 + H2O → H3O+ HSO4-

  • H2O + H2O → H3O+ + OH-

  • H2O + NH2- → NH+ OH-

  • H2O + NH3 → NH4+ + OH-


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5.

Which of the following is not a equilibrium ?

  • Ice  Water

  • I2(s)  I2(g)

  • S (l)  S (g)

  • 3O2 2O3


D.

3O2 2O3

When a compound or element exists in different phases (states), a physical equilibrium exists between them.

(a) Ice( solid state of H2O)  Water(liquid state of H2O) ( physical equilibrium)(b) I2(s)  I2 (g) (physical equilibrium)(c) S (l)  S(g) (physical equilibrium)(d) 3O2(g)   2O3(g)

O2 and O3 are the allotropes of oxygen, ie, have different composition, so the equilibrium exist between them is considered as chemical equilibrium.


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6.

2.5 L of NaCl solution contain 5 moles of the solute. What is the molarity ?

  • 5 M

  • 2 M

  • 2.5 M

  • 12.5 M


7.

The calculated bond order in O2- ions is

  • 1

  • 1.5

  • 2

  • 2.5


8.

The entropy of a perfectly crystalline material is zero at 0°C. This is statement of

  • first law of thermodynamics

  • second law of thermodynamics

  • third law of thermodynamics

  • law of conservation of energy


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9.

In acidic medium, the equivalent weight of  K2Cr2O7 ( Mol. wt. = M) is

  • M

  • M/2

  • M/3

  • M/6


10.

When a metal atom combines with a non-metal atom, the non-metal atom will

  • lose electrons and decrease in size

  • lose electrons and increase in size

  • gain electrons and decrease in size

  • gain electrons and increase in size 


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