Advertisements
Advertisements
प्रश्न
Complete the table given below.
| Heat on ammonium dichromate | Name of neutral gas evolved |
उत्तर
| Heat on ammonium dichromate | Name of neutral gas evolved | Colourless (N2 Nitrogen) |
APPEARS IN
संबंधित प्रश्न
The gas we use in the kitchen is called liquefied petroleum gas (LPG). In the cylinder, it exists as a liquid. When it comes out from the cylinder it becomes a gas (Change − A), then it burns (Change − B). The following statements pertain to these changes. Choose the correct one.
Define precipitation.
Give reason.
Acidic soil is treated with quick lime.
Write true or false :
When potassium iodide solution is added to lead acetate solution a red precipitate is formed.
Explain the following reaction with one suitable example of Decomposition reaction
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.
Out of sodium and sulphur which is a metal? Explain its reaction with the oxygen.
Show with the help of diagram of electronic configuration how the following compound is formed from the constituent atoms.
Potassium fluoride
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
Complete and balance the following reaction:
\[\ce{Pb(NO3)2 ->[\Delta]}\]
State the original colour of the following substance and colour of residue obtained after heating.
Zinc carbonate
Explain the term ‘chemical reaction’ with special reference to – ‘reactants’ and ‘products’.
Select the correct answer for the following options:
The basic gas obtained when two gases react in presence of a catalyst and the reaction is exothermic.
Give a word equation for the following reaction.
Two solids which combine on heating, to give a liquid.
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.
Higher order Thinking question
Peeled and unpeeled banana does not look the same. Does that mean peeling banana is a chemical change?
Beating an egg to make a cake is a ______.
The simplest method of preventing rusting of iron is to coat it with oil, grease, or paint. The reason being ______.
Write a note on the following:
Fermentation
