1:   all the elements in a group in the periodic table have the same
Options:
  1. atomic number
  2. electronic configuration
  3. atomic weight
  4. number of electrons in the outermost shell

Answer: Option 4

Explanation:

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2:   Electron affinity is the
Options:
  1. energy absorbed when an electron is added to an isolated atom in the gaseous state
  2. energy released when an electron is added to an isolated atom in the gaseous state
  3. energy required to take out an electron from an isolated gaseous atom
  4. power of an atom to attract an electron to itself

Answer: Option 2

Explanation:

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3:   Which pair of elements has same chemical properties
Options:
  1. 13,22
  2. 3,11
  3. 4,24
  4. 2,4

Answer: Option 2

Explanation:

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4:   Variable valency in general, is exhibited by
Options:
  1. transition elements
  2. gaseous elements
  3. non metals
  4. s- block elements

Answer: Option 1

Explanation:

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5:   A trend common to both groups I and VII elements in the periodic table as atomic number increases is
Options:
  1. oxidising power increases
  2. atomic radius increases
  3. maximum valency increases
  4. reactivity with water increases

Answer: Option 2

Explanation:

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6:   An element of atomic weight 40 has 2,8,8,2 as the electronic configuration. Which one of the following statements regarding this element is not correct
Options:
  1. it belongs to II group of the periodic table
  2. it has 20 neutrons
  3. the formula of its oxide is MO2
  4. it belongs to 4th period of the periodic table

Answer: Option 3

Explanation:

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7:   The heaviest atom among the following is
Options:
  1. U
  2. Ra
  3. Pb
  4. Hg

Answer: Option 1

Explanation:

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8:   Mendeleef's periodic law is based on
Options:
  1. atomic weight
  2. atomic number
  3. number of neutrons
  4. none of the above

Answer: Option 1

Explanation:

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9:   In the ground state of cobalt atom (Z= 27) there are ---- unpaired electrons and thus the atom is --------
Options:
  1. 2, diamagnetic
  2. 2, paramagnetic
  3. 3, diamagnetic
  4. 3, paramagnetic

Answer: Option 4

Explanation:

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10:   The statement that is false for the long form of the periodic table is
Options:
  1. it reflects the sequence of filling the electrons in the order of sub energy levels s,p,d, F
  2. It helps to prediet the stable valency states of the elements
  3. it reflects trends in physical and chemical properties of the elements
  4. None of the above

Answer: Option 2

Explanation:

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When we lose one we love, our bitterest tears are called forth by the memory of hours when we loved not enough.
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