Advertisements
Advertisements
Question
What do you observe when Cobalt chloride paper is introduced in water vapour.
Advertisements
Solution
It turns blue cobalt chloride paper pink.
\[\ce{\underset{\text{Blue}}{CoCl2} + 2H2O -> \underset{\text{(Pink)}}{CoCl2.2H2O}}\]
APPEARS IN
RELATED QUESTIONS
FILL IN THE BLANK
On reaction with sulphuric acid solution, barium chloride forms a white precipitate of ........ sulphate.
Explain the following reaction with one suitable example of Decomposition reaction
Give reason for the following:
Silver nitrate solution is kept in coloured bottles.
Name the gases which turn moist red litmus blue.
What do you observe when HCI is passed through a silver nitrate solution.
Give a chemical test to distinguish between the following gases.
SO2 and Cl2
What is a chemical reaction?
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 – Addition of dilute hydrochloric acid to silver nitrate.
Give a balanced equation for the conversion of an ammonium salt to a basic gas.
Chemical changes are important in our day-to-day life. Give examples.
