Advertisements
Advertisements
प्रश्न
What do you observe when CO2 is passed through lime water first and then a little in excess.
Advertisements
उत्तर
When the gas is passed through lime water, it turns milky due to the formation of a white precipitate of calcium carbonate.
\[\ce{Ca(OH)2 + CO2 -> CaCO3↓ + H2O}\]
The milkiness disappears when CO2 is passed in excess.
\[\ce{\underset{\text{Black}}{CaCO3} + CO2 -> H2O + \underset{\text{(Soluble)}}{Ca(HCO3)2}}\]
APPEARS IN
संबंधित प्रश्न
State whether the following statement is true or false. In case a statement is false, write the corrected statement.
Condensation of steam is not a chemical change.
How would you show that setting of curd is a chemical change?
Complete and balance the following chemical equations:
Zn + `"H"_2"SO"_4` `→`
(dil)
Define electrolysis.
Complete the statement by filling the gaps using appropriate term from the terms given in the bracket.
(slow, coloured, arrow, fast, smell, milky, physical, product, chemical, reactant, covalent, ionic, octet, duplet, exchange, sharing, equality sign)
A colourless solution of calcium hydroxide in a test tube turns ______ on blowing in it through a blow tube for some time.
Give an example of a reaction where the following are involved
Light
Distinguish by heating the following in dry test tubs.
Ammonium Chloride and iodine.
Complete the table given below.
| Heat on Zinc nitrate | Colour of residue |
What is the use of indicator?
A chemical change may involve –
