1:   Atomic number and atomic mass of Ca is 20 and 40 respectively. Which of the following statement is not true for Ca atom
Options:
  1. number of electrons are equal to that of neutrons
  2. number of nucleons are twice of electrons
  3. number of protons is half of the number of neutrons
  4. none of these

Answer: Option 3

Explanation:

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2:   If value of azimuthal quantum number is one, the shape of orbital will be
Options:
  1. spherical
  2. dumb-bell
  3. double dumb bell
  4. none of these

Answer: Option 2

Explanation:

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3:   If the nitrogen tom had electronic configuration 1s2, it would have energy lower than that of the normal ground state configuration 1s2, 2s22p3, because the electrons would would be closer to the nucleus. Yet, 1s7 is not observed because it violates
Options:
  1. Heisenberg uncertainty principle
  2. Hund's rule
  3. Pauli exclusion exclusion principle
  4. Bohr postulate of stationary orbits

Answer: Option 4

Explanation:

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4:   Electronic configuration of an element is 1s2, 2s2 2p6, 3s23p63d5, 4s1. It represents
Options:
  1. excited state
  2. ground state
  3. cationic form
  4. none of these

Answer: Option 2

Explanation:

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5:   Following quantum numbers are possible for how many orbitals n=3, l=2, m =+2
Options:
  1. 1
  2. 2
  3. 3
  4. 4

Answer: Option 1

Explanation:

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6:   Number of nodal plane in Px orbital
Options:
  1. 0
  2. 1
  3. 2
  4. 3

Answer: Option 2

Explanation:

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7:   Electronic configuration of metal M is 1s2, 2s22p6, 3s1. the formula of its oxide will be
Options:
  1. MO
  2. M2O3
  3. M2O
  4. none of these

Answer: Option 3

Explanation:

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8:   Electrons are filled according to increasing order of energy of different orbitals, this is the statement of
Options:
  1. Pauli's
  2. Aufbau's
  3. Hund's
  4. none of these

Answer: Option 2

Explanation:

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9:   outermost electronic configuration of Mn 2+ ion ( atomic number is 25) in lowest energy state is
Options:
  1. 3d5
  2. 3d3, 4s2
  3. 3d4, 4s2
  4. none of these

Answer: Option 1

Explanation:

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10:   Who modified Bohr's model by suggesting major orbit of electron
Options:
  1. Hund
  2. Thomson
  3. Sommerfield
  4. none of these

Answer: Option 3

Explanation:

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