Advertisements
Advertisements
प्रश्न
Complete and balance the following chemical equations
Na + H2 O →
Advertisements
उत्तर
\[\ce{Na + H2O→2NaOH + H2↑}\]
APPEARS IN
संबंधित प्रश्न
What are (i) positive catalysts and (ii) negative catalysts? Support your answer with one example for each of them.
FILL IN THE BLANK
In a double decomposition precipitation reaction both the reactants must be ............ soluble.
FILL IN THE BLANK
Positively charged ions are called ........
Write true or false :
No new substance is formed during a chemical reaction.
Explain the following reaction with one suitable example of Displacement reaction.
Give an example of a reaction where the following are involved:
Solution
Define a photochemical reaction.
Multiple choice:
Which of the following is not a characteristic of a chemical change?
Complete the following table and write your observations.
|
Hydrogen sulphide |
Ammonia |
Sulphur dioxide |
Hydrogen chloride |
|
|
Shake the gas with red litmus solution |
||||
|
Shake the gas with blue litmus solution |
||||
|
Apply a burning splint to a gas |
Give a chemical test to distinguish between the following gases.
HCl and Cl2
Give a chemical test to distinguish between the following gases.
NH3 and SO2
Give reason for the following:
A characteristic change of colour is seen when a piece of iron is added to copper [II] sulphate solution.
Name the following:
The products obtained during ‘photosynthesis’ – which is a chemical change.
Complete the table given below.
| Addition of dil. H2SO4 to FeS | Odour of gas evolved |
Name the solid residual product formed reaction and state its colour during – thermal decomposition of the following substance.
Lead nitrate.
What is the role of a catalyst in a chemical reaction?
The chemical name of baking soda is sodium bicarbonate.
Chemical changes are important in our day-to-day life. Give examples.
Acid rain is a result of ______.
