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प्रश्न
Out of sodium and sulphur which is a metal? Explain its reaction with the oxygen.
उत्तर
Out of sodium and sulphur, sodium is a metal. so sodium reacts with oxygen to form sodium oxide.
\[\ce{\underset{Sodium}{4Na(s)} + \underset{Oxygen}{O2(g)} -> \underset{Sodium oxide}{2Na2O(s)}}\]
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संबंधित प्रश्न
Complete and balance the following chemical equations:
N2 + O2 →
MULTIPLE CHOICE QUESTIONS
Tick the most appropriate answer.
Which one of the following alters the rate of the chemical reaction without itself undergoing any change?
- temperature and Pressure
- concentration of reactants
- presence of catalyst
- none of these
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 |
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Write the chemical reaction where the following changes are observed.
Precipitate is formed
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NaOH + HCl → NaCl + H2O
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\[\ce{Pb(NO3)2 ->[\Delta]}\]
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| Hydrogen | Oxygen | Carbon dioxide | Chlorine | |
| Litmus test | ||||
| Apply a burning splint to the gas | ||||
| Colour of gas | colourless | colourless | colourless | greenish-yellow |
| Odour of gas |
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\[\ce{H->H+}\]
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______ change results in the change of the substance.
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