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प्रश्न
Complete and balance the following chemical equation:
\[\ce{Pb(NO3)2 ->[Heat]}\]
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उत्तर
\[\ce{Pb(NO3)2 ->[heat] 2PbO + 4NO2 + O2\uparrow}\]
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संबंधित प्रश्न
How do the following help in bringing about a chemical change?
catalyst .
Complete and balance the following chemical equations:
Ba`"CI"_2` + `"H"_2"SO"_4` `→`
(aq.) (aq.)
FILL IN THE BLANK
The new substances formed during a chemical reaction are called the ..................
FILL IN THE BLANK
Distillation is a method of obtaining pure ............. from a solution.
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 |
What are homogenous reactions ?
Write true or false :
When iron and sulphur are heated together a grey mass is formed which is attracted by a magnet .
Explain by writing a word equation.
Hard water gets softened on mixing with a solution of washing soda.
Give an example of a reaction where the following are involved
Heat
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 Cobalt chloride paper is introduced in water vapour.
A chemical reaction is often accompanied by external indications or characteristics.
True or False. If false, give the correct answer.
Taking a glass of water and freezing it by placing it in the freezer is a chemical change.
When lithium metal is placed in hydrochloric acid, _______ gas is evolved.
Silver metal can displace hydrogen gas from nitric acid.
______ change results in the change of the substance.
On heating calcium carbonate gets converted into calcium oxide and carbon dioxide.
(a) Is this a physical or a chemical change?
(b) Can you prepare one acidic and one basic solution by using the products formed in the above process? If so, write the chemical equation involved.
Write the characteristics of chemical change.
When milk is mixed with coffee decoction, the colour of milk and decoction changes due to ______.
