Advertisements
Advertisements
प्रश्न
When baking soda is mixed with lemon juice, bubbles are formed with the evolution of a gas. What type of change is it? Explain.
Advertisements
उत्तर
- When baking soda (Sodium hydrogen carbonate) is mixed with lemon juice (citric acid), bubbles form. The bubbles are formed due to the evolution of carbon dioxide gas, which is a chemical change.
- In this change, the citric acid in lemon juice reacts with sodium hydrogen carbonate, resulting in the evolution of carbon dioxide gas.
\[\ce{\underset{(Sodium bicarbonate)}{Baking Soda} + Lemon juice -> \underset{(CO2)}{Carbon dioxide} + Other substances}\]
APPEARS IN
संबंधित प्रश्न
When carbon dioxide is passed through lime water, it turns milky due to the formation of ______.
Fill in the blank:
The substances which undergo chemical change are called _______
Explain by writing a word equation.
Respiration is 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.
H2 and CO2
Give a chemical test to distinguish between the following gases.
SO2 and Cl2
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 – Thermal decomposition of mercury [II] oxide.
What happens when cane sugar is strongly heated? Mention any two changes in it.
Write some materials prepared by chemical changes.
Which of the following are chemical changes?
(i) Decaying of wood
(ii) Burning of wood
(iii) Sawing of wood
(iv) Hammering of a nail into a piece of wood
