JEE Chemistry Solved Question Paper 2014 | 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 emission spectrum of hydrogen discovered first and the region of the electromagnetic spectrum in which it belongs, respectively are

  • Lyman, ultraviolet

  • Lyman, visible

  • Balmer, ultraviolet

  • Balmer, visible


2.

The electronic configuration of Cu is

  • [Ne] 3s2,3p6,3d9,4s2

  • [Ne] 3s2,3p6, 3d10, 4s1

  • [Ne] 3s2,3p6, 3d3,4s2, 4p6

  • [Ne] 3s2,3p6,3d5,4s2,4p4


3.

As per de-Broglie's formula a macroscopic particle of mass 100 g and moving at a velocity of 100 cm s-1 will have a wavelength of

  • 6.6 x 10-29 cm

  • 6.6 x 10-30 cm

  • 6.6 x 10-31 cm

  • 6.6 x 10-32 cm


4.

For one mole of an ideal gas, the slope of V vs. T curve at constant pressure of 2 atm is X L mol-1 K-1.The value of the ideal universal gas constant 'R' in terms of X is

  • X L atm  mol-1 K-1

  • x/2 L atm  mol-1 K-1

  • 2X L atm  mol-1 K-1

  • 2X atm L-1 mol-1 K-1


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5.

At a certain temperature the time-required for the complete diffusion of 200 mL of H2 gas is 30 min. The time required for the complete diffusion of 50 mL of O2 gas at the same temperature will be

  • 60min

  • 30min

  • 45min

  • 15min


6.

The correct order of decreasing H-C-H angle in the following molecule is

     

  • I> II> III

  • II> I> III

  • III> II> I

  • I> III> II


7.

During the emission of a positron from a nucleus, the mass number of the daughter element remains the same but the atomic numbe

  • is decreased by 1 unit

  • is decreased by 2 units

  • is increased by 1 unit

  • remains unchanged


8.

β-emission is always accompanied by

  • formation of antineutrino and α-particle

  • emission of α-particle and γ-ray

  • formation of antineutrino and γ-ray

  • formation of antineutrino and positron


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9.

Four gases P, Q. R and S have almost same values of 'b' but their 'a' values (a, b are van der Waals' constants) are in the order Q < R < S < P. At a particular temperature, among the four gases, the most easily liquefiable one is

  • P

  • Q

  • R

  • S


10.

The compound that will have a permanent dipole moment among the following is

           

  • I

  • II

  • III

  • IV


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