Which mathematical statement did not prove false? from Chemistry

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 Multiple Choice QuestionsMultiple Choice Questions

181.

The element Th90232 belongs to thorium series. Which of the following will act as the end product of the series?

  • 82Pb208

  • 82Bi209

  • 82Pb206

  • 82Pb207


182.

If radius of first Bohr's orbit of hydrogen atom is 'x', then the de-Broglie wavelength of electron in 3rd orbit is nearly

  • 2πx

  • 6πx

  • 9x

  • x/3


183.

Which of the following notations shows the product incorrectly?

  • B510 (α, n) N713

  • Cm96242 (α, 2n) Bk97243

  • N714 (n, p) C614

  • Si1428 (d, y) P1530


184.

Quantum numbers l = 2 and m= 0 represent the orbital

  • dxy

  • dx2-y2

  • dz2

  • dxz


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185.

The wavelength of associated wave of a particle moving with a speed of one-tenth that of light is 7Å. The particle must be

  • electron

  • proton

  • nanoparticle

  • photon


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186.

Which mathematical statement did not prove false?

  • E= hv

  • R=me48ε02h3c

  • R=n12n22v(n12-n22)c

  • mvr= nh2π


A.

E= hv

The mathematical statement ΔE = hv did not proved false inspite of any verification. Thus equation states that each photon possess energy, E equal to hv It is also known as Planck's equation.


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187.

Np93239 is a β- emitter, but the product is also radioactive and give 235U. Which particles(s) is/ are emitted by the product?

  • 4 neutrons

  • 4 protons

  • 4 protons and 2electrons

  • 2 neutrons and 2 protons


188.

For a f-orbital, the values of m are

  • -1, 0, +1

  • 0, +1, +2, +3

  • -2, -1, 0, +1, +2

  • -3, -2, -1, 0, +1, +2, +3


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189.

A radio isotope will not emit

  • gamma and alpha rays simultaneously

  • gamma rays only

  • alpha and beta rays simultaneously

  • beta and gamma rays simultaneously


190.

A lone pair of electrons in an atom implies

  • a pair of valence electrons not involved in bonding

  • a pair of electrons involved in bonding

  • a pair of electrons

  • a pair of valence electrons


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