Advertisements
Advertisements
Question
When hydrogen burns in oxygen, water is formed; when electricity is passed through water, hydrogen and oxygen are given out. Name the type of chemical change involved in the two cases.
Advertisements
Solution
When hydrogen burns in oxygen, water is formed - Combination Reaction.
When electricity is passed through water, hydrogen and oxygen are given out - Decomposition Reaction.
APPEARS IN
RELATED QUESTIONS
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 is a temporary change.
Write the chemical reaction where the following changes are observed.
Gas is evolved
Give reason for the following:
Silver nitrate solution is kept in coloured bottles.
What do you observe when H2S is passed through a lead nitrate solution.
Distinguish by dilute sulphuric acid.
Sodium sulphide and sodium sulphite?
Give a word equation for the following reaction.
An exothermic reaction where both the reactants are gases, one of which is oxygen.
If you leave a piece of iron in the open for a few days, it acquires a film of brownish substance, called rust.
Can you change rust back into iron by some simple method?
A student took a solution of copper sulphate in a beaker and put a clean iron nail into it and left it for about an hour.
Write a word equation for the chemical change, if any.
The chemical name of baking soda is sodium bicarbonate.
