Subject

Chemistry

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

1.

11Na24 1s radioactive and it decays to:

  • 9F20 and α-particles

  • 13Al24 and positron

  • 11Na23 and neutron

  • 12Mg24 and β-particles


2.

A 100 mL 0.1 = (M) solution of ammonium acetate is diluted by adding 100 mL of water. The pH of the resulting solution will be (pKa of acetic acid is nearly equal to pKb of NH4OH).

  • 4.9

  • 5.0

  • 7.0

  • 10.0


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3.

Equal weights of CH3 and H2 are mixed in an empty container at 25°C. the fraction of the total pressure exerted by H2 is:

  • 1/9

  • 1/2

  • 8/9

  • 16/17


C.

8/9

The ratio of the number of moles of CH4 and H2 are:

CH4:H2x16:x2 = 1:8

Hence, partial pressure exerted by

H281+8 X Ptotal = 8/9 X ptotal


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4.

In a reversible chemical reaction at equilibrium, if the concentration of any one of the reactants is doubled, then the equilibrium constant will:

  • also be doubled

  • be halved

  • remains the same

  • becomes one-fourth


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5.

Which of the following does not represent the mathematical expression for the Heisenberg uncertainty principle?

  • . h/(4π)

  • . ∆v  h/(4πm)

  • ∆E . ∆t  h/(4π)

  • ∆E . ∆x  h/(4π)


6.

The equivalent weight of K2Cr2O7 in acidic medium is expressed in terms of its molecular weight (M) as:

  • M/3

  • M/4

  • M/6

  • M/7


7.

Which of the following is correct?

  • Radius of Ca2+ < Cl- < S2-

  • Radius of Cl- < S2- < Ca2+

  • Radius of Cl- = S2- = Ca2+

  • Radius of S2- < Cl- < Ca2+


8.

The state of hybridization of the central atom and the number of lone pairs over the central atom in POCl3
are:

  • sp , 0

  • sp2 , 0

  • sp3 , 0

  • dsp2 , 1


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9.

20 mL 0.1 (N) acetic acid is mixed with 10 ml  0.l(N) solution of NaOH. The pH of the resulting solution is (pKb of acetic acid is 4.74)

  • 3.74

  • 4.74

  • 5.74

  • 6.74


10.

Which of the following is correct?

  • Evaporation of water causes an increase in disorder of the system

  • Melting of ice causes a decrease in the randomness of the system

  • Condensation of steam causes an increase in disorder of the system

  • There is practically no change in the randomness of the system when water is evaporated


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