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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
Name two metals which will displace hydrogen from dilute acids, and two metals which will not.
What are amphoteric oxides?
Which of the following oxide(s) of iron would be obtained on the prolonged reaction of iron with steam?
Example of an amphoteric oxide is:
Which of the following metals liberate hydrogen with 5% HNO3?
(i) Cu
(ii) Zn
(iii) Mn
(iv) Mg
Which of the following oxide(s) of iron would be obtained on prolonged reaction of iron with steam?
If copper is kept open in air, it slowly loses its shining brown surface and gains a green coating. It 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?
The metal which produces hydrogen gas on reaction with dilute hydrochloric acid as well as sodium hydroxide solution is ______.
Zinc sulphate forms a colourless solution in water. Will you observe any colour on adding copper turning in it?
Out of three metals, sodium, calcium and aluminium, which metal reacts most with water? Give the equation of reaction with all three metals.
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.
Metal oxides generally react with acids, but few oxides of metal also react with bases. Such metallic oxides are:
- MgO
- ZnO
- Al2O3
- Cao
Write a chemical equation showing the ionic products formed on dissolving potassium hydroxide in water.
On adding dilute sulphuric acid to a test tube containing a metal ‘X’, a colourless gas is produced when a burning match stick is brought near it. Which of the following correctly represents the metal ‘X’?
