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प्रश्न
Name an element whsich reacts violently with water at room temperature.
उत्तर
Element reacts with water violently at room temperature is potassium.
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संबंधित प्रश्न
Fill in the blank
Hydrogen is ..................... than air.
Give reason for the following:
Though hydrogen is lighter than air it cannot be collected by downward displacement of air.
TRUE \ FALSE
Hydrogen does not combine with nitrogen under ordinary conditions.
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 |
Complete the following word equation:
Sodium hydroxide + zinc → hydrogen + _________
Give reason for the following:
Purified and dried hydrogen is collected over mercury.
Complete and balance the following reaction.
Fe + HCl →_____________ +___________
Starting from hydrogen gas how would you obtain a basic gas.
Select the correct options for the following statement:
The product formed on combustion of hydrogen in air is ___.
Complete and balance the equation:
[General method]
Reactions of metals with dilute acids
Zinc - Zn + 2HCl → ______ + _______ [g]
