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 Multiple Choice QuestionsMultiple Choice Questions



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


Balmer, visible

Balmer explained the wave numbers of spectral lines present in the visible region in hydrogen spectrum. These are given by-

v (cm-1) = 109677 122 - 1n2

Here, n = 3, 4, 5, ....

Thus, Balmer spectrum of hydrogen was discovered first and it lies in the visible region.


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 × 10-29 cm

  • 6.6 × 10-30 cm

  • 6.6 × 10-31 cm

  • 6.6 × 10-32 cm


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

  • X2L atm mol-1 K-1

  • 2X L atm mol-1 K-1

  • 2 X atm L-1 mol-1 K-1


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

  • 60 min

  • 30 min

  • 45 min

  • 15 min


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


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

  • is decreased by 1 unit

  • is decreased by 2 units·

  • is increased by 1 unit

  • remains unchanged


β- emission is always accompained 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


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


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

  • I

  • II

  • III

  • IV


The correct order of decreasing length of the bond as indicated by the arrow in the following structures is

  • I > II > III

  • II > I > III

  • III > II > I

  • I > III > II