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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.
Give reason:
Sodium, potassium and lithium are stored under oil.
Which of the following oxide(s) of iron would be obtained on the prolonged reaction of iron with steam?
Which of the following metals liberate hydrogen with 5% HNO3?
(i) Cu
(ii) Zn
(iii) Mn
(iv) Mg
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)?
Which of the following oxide(s) of iron would be obtained on prolonged reaction of iron with steam?
Silver articles become black on prolonged exposure to air. This is due to the formation of
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
When a metal X is treated with cold water, it gives a basic salt Y with molecular formula XOH (Molecular mass = 40) and liberates a gas Z which easily catches fire. Identify X, Y and Z and also write the reaction involved.
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 ______.
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.
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
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’?
