Advertisements
Advertisements
प्रश्न
Show with the help of diagram of electronic configuration how the following compound is formed from the constituent atoms.
Water
Advertisements
उत्तर
Step 1: Write the symbols of the radicals.
H O
Step 2: Write the valency below the respective radical.
H O
1 2
Step 3: Cross-multiply symbols of radicals with their respective valency.
Step 4: Write down the chemical formula of the compound.
संबंधित प्रश्न
The gas we use in the kitchen is called liquefied petroleum gas (LPG). In the cylinder, it exists as a liquid. When it comes out from the cylinder it becomes a gas (Change − A), then it burns (Change − B). The following statements pertain to these changes. Choose the correct one.
Complete and balance the following chemical equations
Na + H2 O →
Fill in the blank:
During a chemical reaction transfer of ________ takes place.
Explain by writing a word equation.
Hard water gets softened on mixing with a solution of washing soda.
State the conditions necessary for a chemical change or reaction.
Give examples of exothermic reactions i.e. heat evolved in each of the following:
(a) reaction between a solid and a liquid
(b) reaction between two gases
Give two examples of exothermic reactions seen in everyday life.
A chemical reaction is often accompanied by external indications or characteristics which include –
- Colour change
- Effervescence or gas evolved
- Evolution or absorption of heat
- Formation of a precipitate.
With reference to each of the above indications, state the external indication seen during – Addition of dilute hydrochloric acid to silver nitrate.
Complete the table given below.
| Heat on sodium chloride | Colour imparted to flame during flame test |
Give a balanced equation for a reaction involving the evolution of gas on the addition of dilute acid to sodium sulphite.
When carbon dioxide is passed through lime water ______.
