An artificial radioactive isotope gave 714N after two successive

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191.

An artificial radioactive isotope gave 714N after two successive β-particle emissions. The number of neutrons in the parent nucleus must be

  • 9

  • 14

  • 5

  • 7


A.

9

Atomic number increases by one after the emission of one β-particles. Hence, the parent nucleus ( which on two successive β-emission gave 7N14) must be 5X14. Hence, number of neturons in parents nucleus= 14-5 = 9.


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192.

Nuclear theory of the atom was put forward by

  • Rutherford

  • Aston

  • Neils Bohr

  • J.J. Thomson


193.

The number of 2p electrons having spin quantum number s =-1/2 are

  • 6

  • 0

  • 2

  • 3


194.

The number of α and β- particles emitted during the transformation of 90Th232 to 82Pb208 respectively are

  • 4, 2

  • 2, 2

  • 8, 6

  • 6, 4


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195.

Angular momentum ofan electron in the nth orbit of hydrogen atom is given by

  • nh2π

  • nh

  • 2πnh

  • π2nh


196.

The rate at which a substance reacts depends on its

  • atomic weight

  • atomic number

  • molecular weight

  • active mass


197.

Which of the following cannot be accelerated?

  • α-particle

  • β-particle

  • protons

  • neutrons


198.

In which of the following nuclear reaction neutrons is emitted?

  • Al1327 + He24  P1530

  • C612 + H11  N713

  • P1530  Si1430

  • Am96241 + He24  Bk97245


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199.

Formation of coloured solution is possible when metal ion in the compound contains

  • paired electrons

  • lone pair of electrons

  • unpaired electrons

  • none of the above


200.

A body of mass 10 mg is moving with a velocity of 100 ms-1. The wavelength of de-Broglie wave associated with it would be (h = 6.63 × 10-34 Js)

  • 6.63 × 10-35 m

  • 6.63 × 10-34 m

  • 6.63 × 10-31 m

  • 6.63 × 10-37 m


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