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Question
Name: A brown gas
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Solution
Nitrogen dioxide
NO2
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Show with the help of diagram of electronic configuration how the following compound is formed from the constituent atoms.
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When hydrogen burns in oxygen, water is formed; when electricity is passed through water, hydrogen and oxygen are given out. Name the type of chemical change involved in the two cases.
What do you observe when dilute sulphuric acid is added to the following:
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Match the chemical reactions in List I with the appropriate answer in List II.
| List I | List II | ||
| 1. | \[\ce{XY⇌[heat]X + Y}\] | A: | Displacement reaction |
| 2. | \[\ce{XY->X + Y}\] | B: | Double decomposition |
| 3. | \[\ce{X+Y- + A+B^-->X+B- + A+Y-}\] | C: | Endothermic reaction |
| 4. | \[\ce{X + YZ->XZ + Y}\] | D: | Thermal dissociation |
| 5. | \[\ce{X + Y->[heat]XY -\Delta}\] | E: | Decomposition reaction |
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Which of the following are chemical changes?
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(ii) Burning of wood
(iii) Sawing of wood
(iv) Hammering of a nail into a piece of wood
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