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
Complete and balance the following chemical equations:
Ba`"CI"_2` + `"H"_2"SO"_4` `→`
(aq.) (aq.)
Multiple choice:
Which of the following is not a characteristic of a chemical change?
Complete and balance the following reaction:
Pb(NO3)2 + KI →
State the original colour of the following substance and colour of residue obtained after heating.
Lead nitrate
Give a chemical test to distinguish between the following gases.
CO2 and SO2
Give balanced equation for the following conversion affected by heat alone on the substance:
Ammonium dichromate to nitrogen
Complete the table given below.
| Addition of dil. H2SO4 to KHCO3 | Name of residue obtained |
A chemical reaction is often accompanied by external indications or characteristics.
Give two examples where a chemical reaction is accompanied by a change in colour of the reactants and products on completion of the reaction.
Which of the following is not an “element + element → compound” type reaction?
