Advertisements
Advertisements
प्रश्न
Fill in the blank.
The formation of gas bubbles in a liquid during a reaction is called ......................
Advertisements
उत्तर
The formation of gas bubbles in a liquid during a reaction is called effervesence
APPEARS IN
संबंधित प्रश्न
Complete and balance the following chemical equations:
Ba`"CI"_2` + `"H"_2"SO"_4` `→`
(aq.) (aq.)
Fill in the blank
A catalyst either ................or ............... the rate of a chemical change but itself remains ............... at the end of the reaction.
Define electrolysis.
Fill in the blank:
The substances which undergo chemical change are called _______
Write true or false :
Hydrogen sulphide has rotten egg smell .
Explain by writing a word equation.
Limestone powder disappears on adding to dilute hydrochloric acids.
Give an example of the following chemical change.
Two gases combine to form white solid
What is a chemical change? Give two examples of chemical change?
Give an example of the following chemical changes.
A reaction involving
(i) Change of state
(ii) formation of precipitate
Name: Two nitrates that do not produce nitrogen dioxide on heating.
State the original colour of the following substance and colour of residue obtained after heating.
Zinc carbonate
Give a chemical test to distinguish between the following gases.
HCl and H2S
Write your observation and a balanced equation in the case of the following substances being heated.
Ammonium dichromate.
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 – Thermal decomposition of mercury [II] oxide.
Name the solid residual product formed reaction and state its colour during – thermal decomposition of the following substance.
Lead nitrate.
______ is not a chemical change.
Classify the following as physical or chemical properties
Zinc dissolves in hydrochloric acid with the evolution of hydrogen gas.
Melting of wax is a change where a solid changes to liquid state. Give one more such change which you observe in your surroundings
Which is used as a catalyst during the process of hydrogenation of oils?
