Subject

Chemistry

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

1.

The correct sets of quantum numbers which represents the highest energy level in an atomis:

  • n=4 , l=0 , m=0 , s = + 12

  • n=3 , l=0 , m=0 , s = + 12

  • n=3 , l=1 , m=1 , s = + 12

  • n=3 , l=2 , m= -1 , s = + 12


2.

The vapour pressure of pure water is 25.0 mm Hg and that of an aqueous dilute solution of urea in 20mm Hg at 25°C. The molarity of the solution is:

  • 12.6

  • 14.9

  • 13.8

  • 9.6


3.

The entropy will be positive in which of the following reaction change.

  • H2(g) + I2 (g)  2HI (g)

  • HCl(g) + NH3 (g)  N2O(g) + 2H2O(g)

  • NH4NO3(s)N2O(g) + 2H2O(g)

  • MgO(s) + H2(g)  Mg(s) + H2O(l)


4.

Wave number of a spectral line for a given transition is xcm-1 for He+ then its value for Be+ (iso electronic of H+) for same transition is:

  • x cm-1

  • 4x cm-1

  • x4cm-1

  • 2x cm-1


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5.

The hybridisation and shape of IF5 are respectively:

  • sp3d , trigonal bipyramide

  • sp3d , see saw

  • sp3d , square pyramidal

  • sp3d , pentagonal pyramidal


6.

On adding A to the reaction at equilibrium, AB (s)  A(g) + B(g) the new equilibrium concentration of A becomes double, the equilibrium concentration of B would become:

  • 1/2 of its original value

  • 1/4 of its original value

  • 1/8 of its original value

  • Twice its original value


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7.

Assuming that Hund's rule in violated,the bond order and magnetic nature of the  diatomic molecule B2 is:

  • 1 and diamagnetic

  • 0 and diamagnetic

  • 1 and paramagnetic

  • O and paramagnetic


A.

1 and diamagnetic

B2 : Total electrons = 10

Configuration : σ1s2 , σ* 1s2 ,  σ2s2 , σ* 2s2 ,  π2px1  π2py1

If Hund's rule is violated, then

σ1s2 , σ* 1s2 ,  σ2s2 , σ* 2s2 ,  π2px2  π2py0

So, diamagnetic bond order = 6-42 = 1


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8.

A solution contains 10 mL of 0.1 N NaOH and 10mL of 0.05 NH2SO4.pH of this solution is:

  • zero

  • less than 7

  • greater than 7

  • 7


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9.

A cylinder of compressed gas contains nitrogen and oxygen in the ratio of 3:1 by mole. The total mass of the gas mixture if the cylinder is known to contain 2.5 x 10g of oxygen will be:

  • 8 x 103 g

  • 9 x 10g

  • 9 x 103 g

  • 8 x 102 g


10.

Which of the following ions has the highest value of ionic radius:

  • O2-

  • F-

  • Li+

  • B3+


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