Advertisements
Advertisements
Question
Name the solid residual product formed reaction and state its colour during – thermal decomposition of the following substance.
Zinc carbonate.
Solution
Solid residual product of thermal decomposition of:
| Zinc carbonate | \[\ce{\underset{\text{Zinc oxide}}{ZnO}}\] | White |
APPEARS IN
RELATED QUESTIONS
What are (i) positive catalysts and (ii) negative catalysts? Support your answer with one example for each of them.
How is a strong electrolyte different from a weak electrolyte?
Fill in the blank:
During a chemical reaction transfer of ________ takes place.
Write balanced chemical equations for the reactions represented by word equations in the conditions for chemical reaction.
Explain the following reaction with one suitable example of Decomposition reaction
Name the type of chemical reaction shown by the following equation:
2Mg + O2 → 2MgO
Choose the correct option from the bracket and explain the statement giving reason.
(Oxidation, displacement, electrolysis, reduction, zinc, copper, double displacement, decomposition)
To prevent rusting, a layer of ______ metal is applied on iron sheets.
Give a chemical test to distinguish between the following gases.
SO2 and Cl2
Distinguish by heating the following in dry test tubs.
Ammonium Chloride and iodine.
Write your observation and a balanced equation in the case of the following substances being heated.
Ammonium chloride
Name the following:
The products obtained during ‘photosynthesis’ – which is a chemical change.
What is a chemical reaction?
Complete the table given below.
| Heat on iodine crystals | Colour of vapours evolved |
State the following reaction represent oxidation or reduction.
\[\ce{Cu++->Cu}\]
The changes in which new substance with new chemical properties are formed are ______.
The water we drink is a combination of hydrogen and oxygen.
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 |
Give an example where heat, light, and sound are produced during a chemical change.
We are advised to not to play with fireworks. Give reason.
Assertion (A): Cutting paper into very small pieces is an irreversible change.
Reason (R): Physical changes are always reversible.
