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Periodic Classification of Elements

Periodic Classification of Elements

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Questions

Question 1 Multiple Choice (Single Answer)

According to Newland`s law of octaves, beryllium resembles which of the following elements?

  1. Sodium
  2. Magnesium
  3. Calcium
  4. Aluminium
Question 2 Multiple Choice (Single Answer)

Which of the following properties is formulated by Mandeleev?

  1. The properties of elements are the periodic functions of their atomic radii.
  2. The properties of elements are the periodic functions of their atomic numbers.
  3. The properties of elements are the periodic functions of their atomic masses.
  4. The properties of elements are the periodic functions of their number of elements.
Question 3 Multiple Choice (Single Answer)

Which one of the following statements regarding hydrogen is wrong?

  1. Hydrogen has three isotopes.
  2. Hydrogen may be prepared by the action of hot 20% NaOH on silicon.
  3. Nascent hydrogen reduces ferric chloride to ferrous chloride.
  4. Hydrogen gas is corrosive in nature.
Question 4 Multiple Choice (Single Answer)

Noble gases are so called because they

  1. exhibit chemical inertness
  2. react only with carbon compounds
  3. are very reactive
  4. cannot produce oxygen
Question 5 Multiple Choice (Single Answer)

What is the valency of 52X24?

  1. + 2
  2. - 2
  3. + 1
  4. - 1
Question 6 Multiple Choice (Single Answer)

Which of the following is true with respect to atomic size?

  1. H > F > Cl > Br > I
  2. H < F < Cl < Br < I
  3. F < Br < H < Cl < I
  4. Br < Cl < H < F < I
Question 7 Multiple Choice (Single Answer)

Why is the ionisation energy of sulphur less than that of phosphorus though sulphur is next to phosphorus in the period?

  1. Because atomic radius of sulphur is greater than that of phosphorus.
  2. Because sulphur has half filled electronic configuration.
  3. Because phosphorus has half filled electronic configuration.
  4. Because ionisation energy decreases along the period in the 3rd period.
Question 8 Multiple Choice (Single Answer)

Which of the following is a powerful oxidising agent in 3rd period?

  1. Chlorine
  2. Sulphur
  3. Sodium
  4. Bromine
Question 9 Multiple Choice (Single Answer)

Which of the following is a metalloid?

  1. Magnesium
  2. Gallium
  3. Germanium
  4. Vanadium
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