Q63 of 70 Page 113

Note : In the following questions a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.

Osmium has the highest oxidation state of +8 because it can expand it’s octet and use all its 8 electrons.


Electronic configuration of Os- [Xe] 4f14 5d6 6s2


5d6 and 6s2 can be excited to get an oxidation state of +8

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61

Note : In the following questions a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.

 62

Note : In the following questions a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.

 64

Identify A to E and also explain the reactions involved.


 65

When a chromite ore (A) is fused with sodium carbonate in free excess of air and the product is dissolved in water, a yellow solution of compound (B) is obtained. After treatment of this yellow solution with sulphuricacid,compound (C) can be crystallised from the solution. When compound (C) is treated with KCl, orange crystals of compound (D) crystallise out. Identify A to D and also explain the reactions.