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A chemical reaction is often accompanied by external indications or characteristics which include –
- Colour change
- Effervescence or gas evolved
- Evolution or absorption of heat
- Formation of a precipitate.
With reference to each of the above indications, state the external indication seen during – Thermal decomposition of mercury [II] oxide.
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Differentiate between the following:
Neutralization reaction and a precipitation reaction.
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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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Give three reasons why carbon dioxide finds application in fire extinguishers.
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Write the molecular formulae of Copper oxide.
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Write the molecular formula of the following compounds of Sulphur trioxide.
Find the number and names of elements present in them and calculate their molecular masses.
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Write the molecular formula of the following compounds of Iron (II) sulphide and.
Find the number and names of elements present in them and calculate their molecular masses.
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Write the molecular formula of the following compounds of Ammonia
Find the number and names of elements present in them and calculate their molecular masses.
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Define of Molecular formula.
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Write the molecular formula for the oxide and sulphide of following elements of Sodium.
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Write the molecular formula for the oxide and sulphide of following elements of Calcium
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Write the molecular formula for the oxide and sulphide of following elements of Hydrogen
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Write the molecular formulae for the following compounds and name the elements present of Baking soda.
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Write the molecular formulae for the following compounds and name the elements present of Common salt.
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Write the molecular formulae for the following compounds and name the elements present of Sulphuric acid
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Write the molecular formulae for the following compounds and name the elements present of Nitric acid.
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The valency of aluminium is 3. Write the valency of other radicals present in the following compound.
Aluminium chloride
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The valency of aluminium is 3. Write the valency of other radicals present in the following compounds of Aluminium oxide.
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The valency of aluminium is 3. Write the valency of other radicals present in the following compounds of Aluminium nitride
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The valency of aluminium is 3. Write the valency of other radicals present in the following compounds of Aluminium sulphate.
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