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What do you observe when an acid is added to a basic solution.
Concept: undefined >> undefined
MULTIPLE CHOICE QUESTIONS
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Which one of the following alters the rate of the chemical reaction without itself undergoing any change?
- temperature and Pressure
- concentration of reactants
- presence of catalyst
- none of these
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MULTIPLE CHOICE QUESTIONS
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Reduction reaction is the exact opposite of
- displacement reaction
- decomposition reaction
- oxidation reaction
- none of these
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MULTIPLE CHOICE QUESTIONS
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Which of the following is a reducing agent?
- oxygen
- chlorine
- hydrogen
- none of these
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MULTIPLE CHOICE QUESTIONS
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Reduction is a chemical reaction in which there is
- removal of hydrogen
- removal of oxygen
- addition of oxygen
- none of these
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MULTIPLE CHOICE QUESTIONS
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Compounds, which in their molten state allow an electric current to pass through them are called
- electrolytes
- non-electrolytes
- non-conductors
- none of these
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MULTIPLE CHOICE QUESTIONS
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Miscible liquids having slightly different boiling points can be separated by the
- evaporation
- distillation
- fractional distillation
- sedimentation
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A .............. change is a temporary change.
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In a double decomposition precipitation reaction both the reactants must be ............ soluble.
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In a .............reaction, an acid reacts with a base to form salt and water as the only products.
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On reaction with sulphuric acid solution, barium chloride forms a white precipitate of ........ sulphate.
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........... electrolytes dissociate completely in aqueous state and allow large amount of electricity to flow through it.
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Negatively charged ions are called ..........
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In a ............ change, new substances are formed.
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The new substances formed during a chemical reaction are called the ..................
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Positively charged ions are called ........
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Distillation is a method of obtaining pure ............. from a solution.
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MATCH THE COLUMNS
| 1 . `H_2` + `CI_2` `→` 2HCI | a. displacement reaction |
| 2. `2FeCI_3`+ `H_2` `→` `2FeCI_2` +2HCI` | b. addition of an electronegative redical |
| 3. Fe + `CuSO_4` `→``FeSO_4` +Cu` | c. removal of an electronegative redical |
| 4. `2H_2O` +`4NO_2`+`O_2` `→` `4HNO_3` | d.reduction by adding hydrogen |
| 5. 3Fe +`3CI_2` `→` `2FeCI_3` | e.electrolysis of water |
| 6. `FeCI_3`+ 3NaOH `→``Fe(OH)_3``↓`+NaCI | F.double decomposition,precipitation reaction |
| 7.`2H_2O` `→` `2H_2``↑`+`O_2` | e. combination or synthesis reaction |
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TRUE \ FALSE
A precipitation reaction takes place only in a solution.
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TRUE \ FALSE
Copper can displace iron from iron sulphate.
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