JEE Chemistry Solved Question Paper 2011 | Previous Year Papers | Zigya

Subject

Chemistry

Class

JEE Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

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1.

The pH of an aqueous solution of CH3COONa of concentration C(M) is given by

  • 7 - 12pKa12log C

  • 12pKw12pKb12log C

  • 12pKw12pKb12log C

  • 12pKw12pKa12log C


2.

If the equilibrium constants of the following equilibria,

SO212O2 → SO3 and 2SO3 → 2SO2 + O2

are given by K1 and K2 respectively, which of the following realation is correct?

  • K21K12

  • K11K23

  • K21K1

  • K2 = (K1)2


3.

The energy of an electron in first Bohr orbit of H-atom is -13.6 eV. The possible energy value of electron in the excited state of Li2+ is

  • -122.4 eV

  • 30.6 eV

  • -30.6 eV

  • 13.6 eV


4.

The amount of the heat released when 20 mL 0.5 M NaOH is mixed with 100 mL 0.1 M HCl is × kJ. The heat of neutralisation is

  • -100 x kJ/mol

  • -50 x kJ/mol

  • + 100 x kJ/mol

  • +50 x kJ/mol


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5.

Which one of the following has the lowest ionisation energy?

  • 1s2, 2s2, 2p6

  • 1s2, 2s2, 2p6, 3s1

  • 1s2, 2s2, 2p5

  • 1s2, 2s2, 2p3


6.

2 g of metal carbonate is neutralised completely by 100 mL of 0.1 N HCl. The equivalent weight of metal carbonate is

  • 50

  • 100

  • 150

  • 200


7.

The representation of the ground state electronic configuration of He by box-diagram as  is wrong because it violates

  • Heisenberg's uncertainty principle

  • Bohr's quantization theory of angular momenta

  • Pauli exclusion principle

  • Hund's rule


8.

The electronic transitions from n = 2 to n= 1 will produce shortest wavelength in (where n = principal quantum state)

  • Li2+ 

  • He+

  • H

  • H+


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9.

In the following electron-dot structure, calculate the formal charge from left to right nitrogen atom; 

  • -1, -1, +1

  • -1, +1, -1

  • +1, -1, -1

  • +1, -1, +1


10.

If the molecular wt. of Na2SOand I2 are M1 and Mrespectively then what will be the equivalent weight of Na2SO3 and I2 in the following reaction?

2S2O32- + I2 → S4O62- + 2I-

  • M1, M2

  • M1, M2 /2

  • 2M1, M2

  • M1, 2M2


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