What is the frequency of a X-ray photon whose momentum is 1.1 x 1

Subject

Chemistry

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

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1.

What is the frequency of a X-ray photon whose momentum is 1.1 x 10-23 kg-ms-2 ?

  • 5 x 1016 Hz

  • 0.5 x 1027 Hz

  • 0.5 x 1018 Hz

  • 5 x 1018 Hz


D.

5 x 1018 Hz

E = mc2

E = hv

mc2 = hv

ν = mc2h = 1.1 × 10-23 × 3 × 1086.6 × 10-34

= 5  x 1018 Hz


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2.

The magnitude of orbital angular momentum of an electron of azimuthal quantum number 2 is :

  • 2h2π

  • 6h2π

  • 2h2π

  • 6h2π


3.

The pH of a 0.02 M solution of HCl is :

  • 2.2

  • 2.0

  • 0.3

  • 1.7


4.

The solubility product of Mg(OH)2 at 25°C is 1.4 x 10-11 .What is the solubility of Mg(OH)2 in g/L ?

  • 0.0047 g/L

  • 0.047 g/L

  • 0.0087 g/L

  • 0.087 g/L


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5.

The heat of formarion of CO2 is - 393 kJ mol-1 .The amount of heat evolved in the formation of 0.156 kg of CO2 .

  • - 1393 kJ

  • + 1165.5 kJ

  • + 1275.9 kJ

  • - 1165.5 kJ


6.

The geometry of methane molecule is :

  • tetrahedral

  • pyramidal

  • octahedral

  • square planar


7.

Heisenberg's uncertainty principle can be explained as :

  •  p × h4π

  • x x  h4π

  • x x  hπ

  •  πhx


8.

The bond energy is the energy required to :

  • dissociate one mole of the substance

  • dissociate bond in 1 kg of the substance

  • break one mole of similar bonds

  • break bonds in one mole of the substance


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9.

Heat of neutralisation of an acid with a base is 13. 7 kcal when :

  • both acid and base are weak

  • acid is weak and base is strong

  • both acid and base are strong

  • acid is strong and base is weak


10.

Hess's law is based on :

  • law of conservation of mass

  • law of conservation of energy

  • enthalpy is a state function

  • none of the above


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