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प्रश्न
Fill in the blank.
The formation of gas bubbles in a liquid during a reaction is called ......................
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उत्तर
The formation of gas bubbles in a liquid during a reaction is called effervesence
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संबंधित प्रश्न
FILL IN THE BLANK
A .............. change is a temporary change.
True or false
New substances are formed in a chemical change.
Fill in the blank
A change in which the substance can be brought back to its original state is called a _______ change.
Define chemical reaction.
Complete the statement by filling the gaps using appropriate term from the terms given in the bracket.
(slow, coloured, arrow, fast, smell, milky, physical, product, chemical, reactant, covalent, ionic, octet, duplet, exchange, sharing, equality sign)
Electron ______ is complete in each hydrogen in a hydrogen molecule.
Write the chemical reaction where the following changes are observed.
Precipitate is formed
Give an example of the following chemical changes.
A reaction involving
(i) Change of state
(ii) formation of precipitate
Give an example of a photochemical reaction.
State the original colour of the following substance and colour of residue obtained after heating.
Copper carbonate
Give a chemical test to distinguish between the following gases.
NH3 and HCl
Write your observation and a balanced equation in the case of the following substances being heated.
Copper nitrate.
State the following reaction represent oxidation or reduction.
\[\ce{Cl- ->Cl}\]
Complete the statement by filling in the blank with the correct word:
The reddish-brown precipitate obtained during a double decomposition precipitation reaction between an iron salt and alkali is __________.
Higher order Thinking question
A very hot glass on putting in cold water cracks. What does this change indicate?
Classify the following processes into physical or chemical changes:
- Beating of aluminium metal to make aluminium foil.
- Digestion of food.
- Cutting of a log of wood into pieces.
- Burning of crackers.
Heat may evolve or be absorbed during a ______ change.
Iron and rust are the same substances.
Write a note on the following:
Fermentation
When milk is mixed with coffee decoction, the colour of milk and decoction changes due to ______.
