The line spectrum of He+ ion will resemble that of : from Chemis

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 Multiple Choice QuestionsMultiple Choice Questions

331.

Dual nature of particle was-given by

  • Bohr theory

  • Thomson model

  • Heisenberg principle

  • de-Broglie equation


332.

A golf-ball weigh 40.0 gm. If it is moving with a velocity of 20.0 ms-1, it's de-Broglie wavelength is

  • 1.66 x 10-34 nm

  • 8.28 x 10-32 nm

  • 8.28 x 10-25 nm

  • 1.66 x 10-24 nm


333.

Which is the shortest wavelength line in the Lyman series of the hydrogen spectrum? (R= 1.097 x 10-2 nm-1)

  • 94.21 nm

  • 91.16 nm

  • 911.6 nm

  • 933.6 nm


334.

Which of the following order of ionisation energy is correct?

  • B < Be < N < C

  • Be > B > C > N

  • B < Be < C < N

  • Be < B < C < N


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335.

An element 'Y' emits one α-and two β- particles to give 'X'. X and Y are

  • isotones

  • isobars

  • isotopes

  • isoelectronics


336.

Consider the following pairs of ions:

I. Sc3+ and Ti4+        II. Mn2+ and Fe2+

III. Fe2+ and Co3+    IV. Cu+ and Zn2+

Among these pairs ofions, isoelectronic pairs would include:

  • II, III and IV

  • I, III and IV

  • I, II and IV

  • I, II and III


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337.

The line spectrum of He+ ion will resemble that of :

  • hydrogen atom

  • Li+ ion

  • helium atom

  • lithium atom


A.

hydrogen atom

As hydrogen atom and He+ ion both have only one electron, hence the line spectrum of both will resemble.


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338.

A body of mass x kg is moving with a velocity of 100 ms-1. Its de-Broglie wavelength is 6.62 x 10-35 m. Hence, x is :

[h = 6.62 x 10-34Js]

  • 0.1 Kg

  • 0.25 Kg

  • 0.15 Kg

  • 0.2 Kg


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339.

The ccrrect statement with regard to H2+ and H2- is :

  • both H2+ and H2- are equally stable

  • both H2+ and H2- do not exist

  • H2- is more stable than H2+

  • H2+ is more stable than H2-


340.

Ionisation potential of hydrogen atom is 13.6 eV. Hydrogen atom in ground state is excited by monochromatic light of energy 12.1 eV. The spectral lines emitted by hydrogen according to Bohr's theory will be

  • one

  • two

  • three

  • four


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