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प्रश्न
Write true or false :
When potassium iodide solution is added to lead acetate solution a red precipitate is formed.
पर्याय
True
False
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उत्तर
False
APPEARS IN
संबंधित प्रश्न
TRUE \ FALSE
Positively charged electrode is called the anode. True or false ?
Name three reducing agents ?
Fill in the blank:
During a chemical reaction transfer of ________ takes place.
Fill in the blank:
In some chemical reactions an insoluble ________ is formed when two solutions are mixed.
Copper carbonate when heated, it turns :
Write the chemical reaction where the following changes are observed.
Precipitate is formed
Give reason for the following:
Silver nitrate solution is kept in coloured bottles.
Explain,giving one example of the following chemical changes:
Reversible reaction
What do you observe when HCI is passed through a silver nitrate solution.
What do you observe when CO2 is passed through lime water first and then a little in excess.
Write your observation and a balanced equation in the case of the following substances being heated.
Copper carbonate.
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 acid to an active metal.
Give balanced equation for the following conversion affected by heat alone on the substance:
Hydrated copper sulphate to sulphur dioxide
Complete the table given below.
| Heat on ammonium dichromate | Name of neutral gas evolved |
Explain with the help of balanced equations, how precipitation reactions are used for identifying the positive radicals in three different salts, each having a different cation [positive ion].
______ gas causes tears in our eyes while cutting onions.
Limestone contains ______ mainly.
Can a nickel spatula be used to stir copper sulphate solution? Justify your answer.
Iron and rust are the same substances.
______ is the chemical name of slaked lime.
