Advertisements
Advertisements
प्रश्न
Fill in the blank:
In some chemical reactions an insoluble ________ is formed when two solutions are mixed.
Advertisements
उत्तर
In some chemical reactions an insoluble precipitate is formed when two solutions are mixed.
APPEARS IN
संबंधित प्रश्न
Complete and balance the following chemical equations:
`"H"_2"S"` + `"CI"_2` `→`
Complete and balance the following chemical equations
NaCI + `AgNO_3` `→`
MULTIPLE CHOICE QUESTIONS
Tick the most appropriate answer.
Miscible liquids having slightly different boiling points can be separated by the
- evaporation
- distillation
- fractional distillation
- sedimentation
What are biocatalysts ?
What are homogenous reactions ?
Write true or false :
No new substance is formed during a chemical reaction.
When electric current is passed through acidulated water ______ of water takes place.
Give an example of a reaction where the following are involved:
Close contact
Multiple choice:
Which of the following is not a characteristic of a chemical change?
Give one example electrochemical reaction.
Write your observation and a balanced equation in the case of the following substances being heated.
Copper nitrate.
Name the following:
The type of change physical or chemical involved – ‘during respiration in human beings’.
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 water to quicklime.
Complete the table given below.
| Heat on sodium chloride | Colour imparted to flame during flame test |
Complete the table given below.
| Flame test for calcium chloride | Acid used for flame test |
Differentiate between the following:
Neutralization reaction and a precipitation reaction.
Photosynthesis is a chemical reaction that takes place in the presence of ______.
What is the role of a catalyst in a chemical reaction?
We are advised to not to play with fireworks. Give reason.
