The product formed is an isobar , if there is : from Chemistry S

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 Multiple Choice QuestionsMultiple Choice Questions

361.

An element with atomic number 84 and mass number 218 loses one a-particle and two β-particles in three successive stages .The resulting element will have :

  • at. no. 84 and mass no. 214

  • at no. 82 and mass no. 214

  • at. no. 84 and mass no. 218

  • at. no. 82 and mass no. 218


362.

A particle is moving 3 times faster than the speed of electron. If the ratio of wavelength of particle and electron is 1.8 x 10-4 then particle is

  • neutron

  • α- particle

  • deuteron

  • tritium


363.

Assertion : Number of radial and angular nodes for 3p-orbital are 1, 1 respectively.

Reason : Number of radial and angular nodes depends only on principal quantum number.

  • If both assertion and reason are true and reason is the correct explanation of assertion.

  • If both assertion and reason are true but reason is not the correct explanation of assertion.

  • If assertion is true but reason is false.

  • If both assertion and reason are false.


364.

Assertion : Bohr model fails in case of multielectron pecies.

Reason : It does not mention electron-electron interactions.

  • If both assertion and reason are true and reason is the correct explanation of assertion.

  • If both assertion and reason are true but reason is not the correct explanation of assertion.

  • If assertion is true but reason is false.

  • If both assertion and reason are false.


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365.

The product formed is an isobar , if there is :

  • α emission

  • β emission

  • α and 1 β emission

  • α and 2 β emission


B.

β emission

Xnm - β Xn + 1m

The atoms of different elements having different atomic number but same mass number are called isobars .So , by emission of one β particle isobar is obtained .


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366.

When Al1327 is bombarded with α - particle , a radioactive isotope of phosphorus P1530 is formed .Which particle is emitted along with P1530 ?

  • Deuteron

  • Proton

  • Electron

  • Neutron


367.

Smallest wavelength occurs for

  • Lyman series

  • Balmer series

  • Paschen series

  • Brackett series


368.

Which of the following is wrong for Bohr model?

  • It establishes stability of atom

  • It is inconsistent with Heisenberg uncertainty principle.

  • It explains the concept of spectral lines for hydrogen like species.

  • Electrons behave as particle and wave


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369.

Assume that you are travelling at a speed of 90 km/h in a small car with a mass of 1050 kg. If the uncertainty in the velocity of the car is 1% ( = 0.9 km/h), what is the uncertainty (in meters) in the position of the car ?

  • x  1×10-35m

  • x  2 × 10-37m

  • x  2× 10-36 m

  • x  4 ×10-38m


370.

For a certain particle , it is found that uncertainty in velocity is reciprocal of uncertainty in position .This implies that :

  • mass of particle > unity

  • mass of particle = unity

  • mass of particle  h

  • mass of particle  h / 4π


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