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
Define catalyst.
TRUE \ FALSE
Weak electrolytes dissociate partially in their aqueous or fused state.
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)
Oxygen is a ______ in respiration.
Give an example of the following chemical changes.
A reaction where colour change is noticed.
Represent the addition of dilute sulphuric acid to zinc by means of a chemical equation. State the function of the arrow between the reactants and products.
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.
Photosynthesis is a chemical reaction that takes place in the presence of ______.
_____ is the basic material to manufacture urea.
Galvanization is a process in which ______ is coated as a layer of iron.
