ICSE ICSE Class 8 - CISCE Question Bank Solutions for Chemistry

Name the gas produced when chlorine is dissolved in water and exposed to sunlight.

MULTIPLE CHOICE QUESTIONS

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Reduction reaction is the exact opposite of

1. displacement reaction
2. decomposition reaction
3. oxidation reaction
4. none of these

Name the gas produced when a piece of calcium is added to water.

MULTIPLE CHOICE QUESTIONS

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Which of the following is a reducing agent?

1. oxygen
2. chlorine
3. hydrogen
4. none of these

Name the gas produced when fossil fuel is burnt.

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Ammonia is used to make ................

MULTIPLE CHOICE QUESTIONS

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Reduction is a chemical reaction in which there is

1. removal of hydrogen
2. removal of oxygen
3. addition of oxygen
4. none of these

MULTIPLE CHOICE QUESTIONS

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Compounds, which in their molten state allow an electric current to pass through them are called

1. electrolytes
2. non-electrolytes
3. non-conductors
4. none of these

MULTIPLE CHOICE QUESTIONS

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Miscible liquids having slightly different boiling points can be separated by the

1. evaporation
2. distillation
3. fractional distillation
4. 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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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.

Why is hydrogen called a reducing agent? Give chemical equation to support your answer ?

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 ................. is present in both living and non-living things.