Advertisements
Advertisements
प्रश्न
State the original colour of the following substance and colour of residue obtained after heating.
Ammonium dichromate
Advertisements
उत्तर
Ammonium dichromate is a bright orange-red crystalline solid. It is readily ignited and burns to produce a voluminous green residue.
APPEARS IN
संबंधित प्रश्न
How do the following help in bringing about a chemical change?
light.
Write the missing reactants and products and balance the equations.
\[\ce{KClO3 ->[heat]}\] ___________+ ____________
MULTIPLE CHOICE QUESTIONS
Tick the most appropriate answer.
Reduction reaction is the exact opposite of
- displacement reaction
- decomposition reaction
- oxidation reaction
- none of these
Balance the following equation :
Fe + H2O → Fe3O4 + H2
Give an example of a reaction where the following are involved:
Close contact
Give an example of the following chemical change.
Two solids combine to form a liquid
Give an example of a photochemical reaction.
A chemical reaction is often accompanied by external indications or characteristics which include –
- Colour change
- Effervescence or gas evolved
- Evolution or absorption of heat
- Formation of a precipitate.
With reference to each of the above indications, state the external indication seen during – Addition of dilute acid to an active metal.
Complete the table given below.
| Heat on ammonium dichromate | Name of neutral gas evolved |
Heat may evolve or be absorbed during a ______ change.
