12th Class Chemistry Chapter 1 Periodic Classification of Elements and Periodicity Short Questions Preparation

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Chemistry - 12th Class Chemistry Chapter 1 Short Questions Preparation

Question # 1

How do member of group V!-A(except oxygen) show+4 and +6 oxidation state?

  • Ans 1: Elements of group VI-Aexcept oxygen show covalency of +2,+4 and +6,+2 oxidation shown due to 2 unpaired electrons in the p orbitals.+4 oxidation state is shown when 1 electron from p-orbital is promoted to the next vacant d-orbital,while +6 oxidation state is shown when another electron from s-orbital is also promoted to the next vacant d-orbital.
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12th Class Chemistry Chapter 1 Short Questions Preparation - Set 1

Question # 1

How do member of group V!-A(except oxygen) show+4 and +6 oxidation state?

  • Ans 1: Elements of group VI-Aexcept oxygen show covalency of +2,+4 and +6,+2 oxidation shown due to 2 unpaired electrons in the p orbitals.+4 oxidation state is shown when 1 electron from p-orbital is promoted to the next vacant d-orbital,while +6 oxidation state is shown when another electron from s-orbital is also promoted to the next vacant d-orbital.
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12th Class Chemistry Chapter 1 Short Questions Preparation - Set 2

Question # 1

Why the oxidation state of noble gases is usually zero?

  • Ans 1: Group VIII A elements,which are also called zero group elements usually show zero oxidation state because there is no vacancy in their outer most shell to accommodate more electrons.
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12th Class Chemistry Chapter 1 Short Questions Preparation - Set 3

Question # 1

The oxidation state vary in a period,but remain almost constant in a group.Give reason.

  • Ans 1: The number of electrons in outermost shells goes on changing in periods from left to the right,So oxidation states go on changing.The number of electrons in the outermost shells remains the same in a group,so the oxidation states remains the same.Anyhow,the process of unpairing of electrons may happen in a group and oxidation states may change.
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12th Class Chemistry Chapter 1 Preparation

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