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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
Complete and balance the following chemical equations
NaCI + `AgNO_3` `→`
Fill in the blanK
A .............is a substance which changes the rate of a chemical reaction without undergoing a chemical change.
Define precipitation reaction.
FILL IN THE BLANK
On reaction with sulphuric acid solution, barium chloride forms a white precipitate of ........ sulphate.
TRUE \ FALSE
Weak electrolytes dissociate partially in their aqueous or fused state.
What are chemical reactions?
Fill in the blank.
Melting of ice is a _______ change.
Write true or false :
Hydrogen sulphide has rotten egg smell .
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)
Oxygen is a ______ in respiration.
Give an example of the following chemical change.
A reaction where colour change is noticed
What do you observe? When
Barium chloride is added to sodium sulphate solution
Name affects the acidified K2Cr2O7 paper and also turns lime water dirty milky.
Complete the following table and write your observations.
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Hydrogen sulphide |
Ammonia |
Sulphur dioxide |
Hydrogen chloride |
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Shake the gas with red litmus solution |
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Shake the gas with blue litmus solution |
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Apply a burning splint to a gas |
Distinguish by heating the following in dry test tubs.
Copper Sulphate and copper carbonate
What do you observe when CO2 is passed through lime water first and then a little in excess.
Distinguish by dilute sulphuric acid.
Sodium Sulphite and sodium carbonate?
Give balanced equation for the following conversion affected by heat alone on the substance:
Ammonium dichromate to nitrogen
Name the solid residual product formed reaction and state its colour during – thermal decomposition of the following substance.
Calcium hydroxide.
Both CO2 and H2 gases are ______.
______ is the chemical name of rust.
