What is X in the following reaction ?12Mg26 + 1H2 →&nbs

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 Multiple Choice QuestionsMultiple Choice Questions

101.

Meson was discovered by

  • Yukawa

  • Austin

  • Moseley

  • Einstein


102.

The following element forms a molecule with eight of its own atoms

  • Si

  • S

  • Cl

  • P


103.

The energy of an electron present in Bohr's second orbit of hydrogen atom is

  • -1312 J atom-1

  • -328 kJ mol-1

  • -328 J mol-1

  • -164 kJ mol-1


104.

In the ground state, an element has 13 electrons in M shell. The element is

  • copper

  • chromium

  • nickel

  • iron


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105.

What is X in the following reaction ?

12Mg261H2 → 12Mg27 + X

  • γ-ray

  • 0n1

  • 1H1

  • 1D2


C.

1H1

Atomic number of X = 1

Atomic mass of X = 1

So, X is 1H1.


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106.

Which one of the following statements is not correct?

  • Rydberg's constant and wave number have same units

  • Lyman series of hydrogen spectrum occurs in the ultraviolet region

  • The angular momentum of the electron in the ground state hydrogen atom is equal to h2π

  • The radius of first Bohr orbit of hydrogen atom is 2.116 × 10-8 cm.


107.

The energy of an electromagnetic radiation is 19.875 × 10-13 ergs. What is its wave number in cm-1? (h = 6.625 × 10-27 erg sec; c = 3 × 1010 cm sec-1)

  • 1000

  • 106

  • 100

  • 10000


108.

If the wavelength of an electromagnetic radiation is 2000 Å, what is its energy in ergs?

  • 9.94 × 10-12

  • 9.94 × 10-19

  • 4.97 × 10-12

  • 4.97 × 10-19


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109.

Which one of the following statements is correct?

  • The radius (R) of a nuclide of mass number A is given by the equation R = R0(A)1/2 (R0 = constant)

  • 7N15 and 8O16 are isobars

  • The end product nuclide in thorium (4n) series is 83Bi209

  • 20Ca40 has magic number of protons and magic number of neutrons


110.

6C12 and 1T3 are formed in nature due to the nuclear reaction of neutron with

  • 7N14

  • 6C13

  • 2He4

  • 3Li6


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