1:   Electronic configuration of an atom is 1s2, 2s2, 2p4. The number of unpaired electrons in it shall be
Options:
  1. 1
  2. 2
  3. 3
  4. 0

Answer: Option 2

Explanation:

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2:   Which of the following orbital has highest energy
Options:
  1. 4f
  2. 5s
  3. 6p
  4. 7s

Answer: Option 4

Explanation:

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3:   In hydrogen spectrum spectral lines of Lyman series are present in region of
Options:
  1. uv
  2. visible
  3. IR
  4. Far IR

Answer: Option 1

Explanation:

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4:   Neutron was discovered by
Options:
  1. Rutherford
  2. Chadwick
  3. Newton
  4. none of these

Answer: Option 2

Explanation:

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5:   Number of electrons in valency shell of calcium
Options:
  1. 2
  2. 4
  3. 1
  4. 3

Answer: Option 1

Explanation:

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6:   Electronic configuration 1s2, 2s2 2p6, 3s2 3p6 3d6 is of
Options:
  1. Mn2+
  2. Fe 2+
  3. Co
  4. Fe

Answer: Option 2

Explanation:

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7:   Which of the following configuration is not as per Aufbau's principle
Options:
  1. 1s2, 2s2, 2p1
  2. [Kr] 4d10, 5s2
  3. [Ar] 3d10, 4s1
  4. none of these

Answer: Option 1

Explanation:

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8:   Number of unpaired electron in Cr 3+ ion is
Options:
  1. 1
  2. 2
  3. 3
  4. 0

Answer: Option 3

Explanation:

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9:   Which metal was bombarded by alpha particles in Rutherford's experiment
Options:
  1. silver
  2. iron
  3. gold
  4. copper

Answer: Option 3

Explanation:

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10:   The maximum number of electron that can be accommodated in 5f orbitals is
Options:
  1. 5
  2. 10
  3. 14
  4. 6

Answer: Option 3

Explanation:

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