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.

C6H6 + O3 → X Zn/ H2O Y; X and Y are respectively.

  • diozonide, glycol

  • triozonide, glyoxalic acid

  • triozonide, glyoxal

  • monoozonide, oxalic acid


2.

If the equilibrium constant for the reaction,

2AB  A2 + B2 

is 49, what is the equilibrium constant for AB  12A1 + 12A2 ? 

  • 7

  • 17

  • 24.5

  • 49


3.

The pH of 0.05 M acetic acid is Ka = 2 × 10-5)

  • 2

  • 11

  • 10-3

  • 3


4.

What is the entropy change in JK-1 during the melting of 27.3 g of ice at 0°C? (Latent heat of fusion of ice = 330 Jg-1)

  • 330

  • 12.1

  • 3.3

  • 33


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5.

Identify the order in which the spin only magnetic moment (in BM) increases for the following four ions

(I) Fe2+

(II) Ti2+

(III) Cu2+

(IV) V2+

  • I, II, IV, III

  • IV, I, II, III

  • III, IV, I, II

  • III, II, IV, I


6.

Which one of the following frequencies of radiation (in Hz) has a wavelength of 600 nm?

  • 2.0 × 1013 

  • 5.0 × 1016 

  • 2.0 × 1014 

  • 5.0 × 1014 


7.

According to Bohr's theory which one of the following values of angular momentum of hydrogen atom is not permitted?

  • 1.25 hπ

  • hπ

  • 1.5  hπ

  • 0.5 hπ


8.

Which one of the following is correct order of second ionisation potential of Na, Ne, Mg and Al?

  • Al < Na < Mg < Ne

  • Ne < Al < Na < Mg

  • Mg < Al < Ne < Na

  • Na < Mg < Ne < Al


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9.

The formal charges of N(1), N(2) and O atoms in the following figure are respectively

  • +1, -1, 0

  • -1, +1, 0

  • +1, +1, 0

  • -1, -1, 0


10.

In which of the following pairs, the central atoms have the same number of lone pairs of electrons?

  • PCl5, BrF5

  • XeF2, ICl

  • XeF4, ClO4-

  • SCl4, CH4


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