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Which of the following does not involve a chemical reaction?

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Important Questions on Language of Chemistry

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7th ICSE
IMPORTANT
Lakhmir Singh's Science Chemistry>Chapter 5 - Language of Chemistry>EXERCISES>Q 3
You are given the solution of lead acetate. In order to obtain a yellow precipitate you should mix with it a solution of:
 
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7th ICSE
IMPORTANT
Lakhmir Singh's Science Chemistry>Chapter 5 - Language of Chemistry>EXERCISES>Q 4
An acid which can decolourise purple-coloured potassium permanganate solution is:
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7th ICSE
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Lakhmir Singh's Science Chemistry>Chapter 5 - Language of Chemistry>EXERCISES>Q 5
The chemical reaction between quicklime and water is characterised by 
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7th ICSE
IMPORTANT
Lakhmir Singh's Science Chemistry>Chapter 5 - Language of Chemistry>EXERCISES>Q 6
Which of the following is formed on heating magnesium ribbon?
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7th ICSE
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Lakhmir Singh's Science Chemistry>Chapter 5 - Language of Chemistry>EXERCISES>Q 7

Which gas is released during the reaction of baking soda with vinegar

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7th ICSE
IMPORTANT
Lakhmir Singh's Science Chemistry>Chapter 5 - Language of Chemistry>EXERCISES>Q 8
In which of the following reaction heat energy is absorbed?
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7th ICSE
IMPORTANT
Lakhmir Singh's Science Chemistry>Chapter 5 - Language of Chemistry>EXERCISES>Q 9
In which of the following statement is correct?
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7th ICSE
IMPORTANT
Lakhmir Singh's Science Chemistry>Chapter 5 - Language of Chemistry>EXERCISES>Q 10
Which of the following reaction is not balanced?