Advertisements
Advertisements
Question
Complete the table given below.
| Addition of dil. H2SO4 to FeS | Odour of gas evolved |
Advertisements
Solution
| Addition of dil. H2SO4 to FeS | Odour of gas evolved | Rotten eggs (H2S Hydrogen sulphide) |
APPEARS IN
RELATED QUESTIONS
MULTIPLE CHOICE QUESTIONS
Tick the most appropriate answer.
Reduction is a chemical reaction in which there is
- removal of hydrogen
- removal of oxygen
- addition of oxygen
- none of these
State four conditions necessary for chemical reactions to take place.
Give reason for the following:
Colourless concentrated sulphuric acid in a test tube changes to blue on adding a small piece of copper to it.
What is a chemical reaction?
Give a balanced equation for a reaction involving the evolution of gas on the addition of dilute acid to sodium sulphite.
Chemical change is a temporary change.
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.
Are these changes chemical in nature?
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 five changes in the characteristics of a substance that can take place during a chemical change.
______ is the chemical name of slaked lime.
