Advertisements
Advertisements
Question
When electric current is passed through acidulated water ______ of water takes place.
Options
Oxidation
Displacement
Electrolysis
Reduction
zinc
copper
Double displacement
Decomposition
Advertisements
Solution
When electric current is passed through acidulated electrolysis of water takes place.
Explanation:
Water decomposes into hydrogen gas and oxygen gas when electric current is passed through acidulated water. Since decomposition of water takes place by means of electrical energy, it is called electrolysis.
APPEARS IN
RELATED QUESTIONS
When baking soda is mixed with lemon juice, bubbles are formed with the evolution of a gas. What type of change is it? Explain.
Give reason .
A person suffering from acidity is advised to take an antacid.
A solution of a substance ‘X’ is used for white washing Name the substance ‘X’ and write its formula.
Give reason for the following:
Blue solution of copper sulphate changes to green when a piece of iron is added to this solution.
What is a chemical change? Give two examples of chemical change?
Complete and balance the following reaction:
\[\ce{Pb(NO3)2 ->[\Delta]}\]
What do you observe when HCI is passed through a silver nitrate solution.
What do you observe when dilute sulphuric acid is added to the following:
Sodium Sulphide
Distinguish by heating the following in dry test tubs.
Copper Sulphate and copper carbonate
Write your observation and a balanced equation in the case of the following substances being heated.
Copper nitrate.
A chemical reaction is often accompanied by external indications or characteristics.
Name the solid residual product formed reaction and state its colour during – thermal decomposition of the following substance.
Copper nitrate.
Name the solid residual product formed reaction and state its colour during – thermal decomposition of the following substance.
Zinc carbonate.
When lithium metal is placed in hydrochloric acid, _______ gas is evolved.
______ is a natural indicator.
A chemical change may involve –
Vanaspati is obtained from vegetable oils by the addition of ______ to the oils.
Match the following:
| Column I | Column II | ||
| 1. | Burning of coal | a. | Rusting |
| 2. | Painting of a surface | b. | Evaporation |
| 3. | Dipping iron in the water | c. | Chemical change |
| 4. | Salt from seawater | d. | Prevention of rusting |
Write a note on the following:
Curdling of milk
