Allied solutions

Allied solutions

Grade 7

Atomic Structure | Exercise

Question 11

Q11) Explain the term - ‘valency’. State giving reasons the valency of -

  1. Chlorine in hydrogen chloride
  2. Sulphate in sulphuric acid
  3. Nitrogen in ammonia
  4. Magnesium in magnesium oxide.

Solution:

Valency is the number of hydrogen atoms that combine or displace with another atom to form a compound.

  1. One atom of hydrogen combines with one atom of chlorine to form HCl, the valency of chlorine is 1.
  2. Two atoms of hydrogen combine with one radical of sulphate to form H2SO4, the valency of sulphate is 2.
  3. Three atoms of hydrogen combine with one atom of nitrogen to form NH3, the valency of nitrogen is 3.

Some compounds do not have hydrogen atoms, then the valency of its elements is their combining power with other elements.

  1. Valency of magnesium in 2MgO is 2, as it needs 2 oxygen atoms to form magnesium oxide.

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Question 11

Q11) Explain the term - ‘valency’. State giving reasons the valency of -

  1. Chlorine in hydrogen chloride
  2. Sulphate in sulphuric acid
  3. Nitrogen in ammonia
  4. Magnesium in magnesium oxide.

Solution:

Valency is the number of hydrogen atoms that combine or displace with another atom to form a compound.

  1. One atom of hydrogen combines with one atom of chlorine to form HCl, the valency of chlorine is 1.
  2. Two atoms of hydrogen combine with one radical of sulphate to form H2SO4, the valency of sulphate is 2.
  3. Three atoms of hydrogen combine with one atom of nitrogen to form NH3, the valency of nitrogen is 3.

Some compounds do not have hydrogen atoms, then the valency of its elements is their combining power with other elements.

  1. Valency of magnesium in 2MgO is 2, as it needs 2 oxygen atoms to form magnesium oxide.

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