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प्रश्न
Complete and balance the following reaction:
Pb(NO3)2 + KI →
उत्तर
Pb(NO3)2 + 2KI →2KNO3 + PbI2
APPEARS IN
संबंधित प्रश्न
FILL IN THE BLANK
On reaction with sulphuric acid solution, barium chloride forms a white precipitate of ........ sulphate.
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 chemical reactions?
Fill in the blank:
The substances which undergo chemical change are called _______
What do you understand by precipitation reaction? Explain with examples.
Give a chemical test to distinguish between the following gases.
CO2 and SO2
Distinguish by dilute sulphuric acid.
Copper and magnesium?
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.
Complete the table given below.
| Heat on Zinc nitrate | Colour of residue |
State the following reaction represent oxidation or reduction.
\[\ce{Fe++->Fe+++}\]
Give a balanced equation for a reaction involving the evolution of gas on the addition of dilute acid to calcium carbonate.
Higher order Thinking question
A very hot glass on putting in cold water cracks. What does this change indicate?
________ is a chemical substance which alters the speed of a chemical reaction.
A reaction between an acid and a base is called ______.
Silver metal can displace hydrogen gas from nitric acid.
Rusting of Iron: undesirable change:: Dead plants turn into manure: ______.
Rusting of iron is ______.
Chemical changes are important in our day-to-day life. Give examples.
Define the following term:
Chemical change
