InterviewSolution
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InterviewSolution
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(A) complete the following chemical equations : (i) `Cu+HNO_(3)` (dilute) `to`(ii) `XeF_(4)+O_(2)F_(2)to`(B) Explain the following observations: (i) Phosphorus has greater tendency for catentation than nitrogen. (ii) Oxygen is a gas but sulphur a solid. (iii) The halogens are coloured. Why ? |
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Answer» (a) (i) `3Cu + 8HNO_(3)` (dilute) `to Cu(NO_(3))_(2) + 2NO + 4H_(2)O` (ii) `XeF_(4) + O_(2)F_(2) overset(143K)(to) XeF_(6)O_(2).` (b) (i) Phosphorus has greater tendency for catenation than nitrogen . Due to greater bond strength of P-P single than N-N single bond . (ii) Oxygen is a gas but sulphur a solid. Sulphur because of its bigger size and lower electronegatively , prefers to form S-S single bonds . Further because of stronger S-S than O-O single bonds , sulphur has a much greater tendency for catenation than oxygen . (iii) Halogen are coloured . It is due to reason that their molecules absorb light in the visible region as a result of which their electrons get excited to higher energy levels while the remaining light is transmitted. |
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