Advertisements
Advertisements
प्रश्न
On heating calcium carbonate gets converted into calcium oxide and carbon dioxide.
(a) Is this a physical or a chemical change?
(b) Can you prepare one acidic and one basic solution by using the products formed in the above process? If so, write the chemical equation involved.
Advertisements
उत्तर
(a) It is a chemical change in which new substances are formed.
(b) Calcium oxide when dissolved in water, forms a basic solution.
\[\ce{CaO + H2O -> (OH)2}\]
Carbon dioxide when dissolved in water, forms an acidic solution
\[\ce{CO2 + H2O -> H2CO3}\]
APPEARS IN
संबंधित प्रश्न
State whether the following statement is true or false. In case a statement is false, write the corrected statement.
Iron pipes coated with zinc do not get rusted easily.
Fill in the blank
A change in which the substance can be brought back to its original state is called a _______ change.
Write true or false.
A chemical equation gives only qualitative information of a chemical reaction.
State the original colour of the following substance and colour of residue obtained after heating.
Zinc carbonate
What do you observe when H2S is passed through a lead nitrate solution.
Give a chemical test to distinguish between the following gases.
HCl and H2S
State whether the following reaction is oxidation or reduction.
\[\ce{Na->Na+}\]
When magnesium is burnt in the air, a new substance is formed which is ______.
Write the characteristics of chemical change.
Collect information about the types of fuels used for cooking in your area. Discuss with your teachers/parents/others which fuels are less polluting and why.
