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प्रश्न
Why are the following metal not used in the lab. preparation of hydrogen?
iron
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उत्तर
Iron has to be heated, and hydrogen thus produced contains impurities such as hydrogen sulphide and sulphur dioxide.
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संबंधित प्रश्न
MATCH THE COLUMNS
| column A | column B |
| 1. `""2H_2 + O_2 → 2H_2O` | A. This reaction is not possible |
| 2. `""H_2+CI_2 →2HCI` | B.This reaction is exothermic to the extent of explosion |
| 3.`""ZaO+ H^2→Zn +H_2O` | C.This reaction is known as Haber process |
| 4.`""Cu + H_2SO^4 → CuSO_4 + H_2 ` | D.This reaction illustrates the reducing property of bydrogen |
| 5.`""N_2 +3H_2 → 2NH_3 +heat ` | E. This reaction takes place in diffused sunlight |
| F. This reaction is a method of preparation of hydrogen |
What is noticed if the products are not allowed to escape?
Give reason for the following:
Dilute sulphuric acid cannot be replaced by concentrated acid in the preparation of hydrogen.
Complete and balance the following reaction.
Mg + H2O →_____________ +___________
Complete and balance the following reaction.
Zn + NaOH →_____________ +___________
Starting from hydrogen gas how would you obtain a basic gas.
Starting from hydrogen gas how would you obtain a metal by reduction of its heated oxide.
Complete and balance the equation:
[General method]
Reactions of metals with steam
Aluminium - 2Al + 3H2O → ______+ _______ [g]
Complete and balance the equation:
[General method]
Reactions of metals with dilute acids
Iron - Fe + 2HCl → ______ + _______ [g]
Give a balanced equation for the following conversion.
\[\ce{MgCl2<-HCl->FeCl2}\]
