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प्रश्न
Answer the questions based on the figure below:
- Which reaction is shown in the figure?
- Which gas is evolved in the reaction?
- Give an example of reactants that rapidly show this reaction. Give equations.
- Give an example of reactants that do not react rapidly.
- In what condition will reactants of (c) part react? Give equation.
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उत्तर
- Reaction of a metal with water.
- Hydrogen gas.
- Sodium and potassium metal react rapidly and vigorously with water and liberate hydrogen gas.
i. \[\ce{2Na(s) + 2H2O(l) -> 2NaOH(aq) + H2(g) + Heat}\]
ii. \[\ce{2K(s) + 2H2O(l) -> 2KOH(aq) + H2(g) + Heat}\] - The metals: aluminium, iron and zinc.
- They react with steam to form their oxides. Hydrogen gas is released in this reaction.
i. \[\ce{2Al(s) + 3H2O(g) -> Al2O3(s) + 3H2(g)}\]
ii. \[\ce{2Fe(s) + 4H2O(g) -> Fe3O4(s) + 4H2(g)}\]
iii. \[\ce{Zn(s) + H2O(g) -> ZnO(s) + H2(g)}\]
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संबंधित प्रश्न
Give two examples of amphoteric oxides.
Give reason:
Sodium, potassium and lithium are stored under oil.
Diamond : electric insulator : : _______ : electric conductor
Which of the following oxide(s) of iron would be obtained on the prolonged reaction of iron with steam?
Which one of the following metals does not react with cold as well as hot water?
Generally, metals react with acids to give salt and hydrogen gas. Which of the following acids does not give hydrogen gas on reacting with metals (except Mn and Mg)?
Silver articles become black on prolonged exposure to air. This is due to the formation of
Metals generally react with dilute acids to produce hydrogen gas. Which one of the following metals does not react with dilute hydrochloric acid?
Which of the following reacts with cold water vigorously?
Material: Copper wire, Iron nail, Beaker or Big test tube.
Chemicals: Ferrous Sulphate and Copper Sulphate Solution.
- Which reaction you will study with the help of the above material and solutions? Draw the diagram of the experiment arrangement.
- How do you identify that the reaction is carried out?
- Which type of reaction did you observe?
Out of three metals, sodium, calcium and aluminium, which metal reacts most with water? Give the equation of reaction with all three metals.
Answer the questions based on the figure below:
- Which experiment setup is demonstrated in the figure?
- What do you conclude after the reactions? Name reaction.
Keerti added dilute Hydrochloric acid to four metals and recorded her observations as shown in the table given below:
| Metal | Gas Evolved |
| Copper | Yes |
| Iron | Yes |
| Magnesium | No |
| Zinc | Yes |
Select the correct observation(s) and give chemical equation(s) of the reaction involved.
Select the appropriate state symbols of the products given as X and Y in the following chemical equation by choosing the correct option from table given below:
\[\ce{Zn_{(s)} + H_2SO_{4(l)} ->ZnSO_{4(X)} + H_{2(Y)}}\]
