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Question
Fill in the blank:
In some chemical reactions an insoluble ________ is formed when two solutions are mixed.
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Solution
In some chemical reactions an insoluble precipitate is formed when two solutions are mixed.
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catalyst .
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| 1 . `H_2` + `CI_2` `→` 2HCI | a. displacement reaction |
| 2. `2FeCI_3`+ `H_2` `→` `2FeCI_2` +2HCI` | b. addition of an electronegative redical |
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What are chemical reactions?
What do you observe when :
an iron nail is kept in tap water for few days
Copper carbonate when heated, it turns :
What do you understand by precipitation reaction? Explain with examples.
Give a chemical test to distinguish between the following gases.
H2 and CO2
Distinguish by heating the following in dry test tubs.
Ammonium Chloride and iodine.
Give a word equation for the following reaction.
Two solids which combine on heating, to give a liquid.
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 – Addition of dilute hydrochloric acid to silver nitrate.
Select the correct answer from the options given below:
State the gaseous product formed, when
An active metal reacts with dilute sulphuric acid.
Differentiate between the following:
Neutralization reaction and a precipitation reaction.
Mention the various conditions required for a chemical reaction to occur.
Write a note on the following:
Fermentation
Why is spoiling food a chemical change?
