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प्रश्न
Select the correct answer for the following options:
The gas which reacts with oxygen to give a neutral liquid.
पर्याय
Hydrogen
Copper [II] oxide
Oxygen
Copper [II] hydroxide
Ammonia
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उत्तर
Ammonia
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संबंधित प्रश्न
FILL IN THE BLANK
Positively charged ions are called ........
TRUE \ FALSE
A precipitation reaction takes place only in a solution.
Write a short note on the information derived from a balanced chemical equation.
A solution of a substance ‘X’ is used for white washing write the reaction of the substance ‘X’ named in (a) above with water.
State the conditions necessary for a chemical change or reaction.
Give an example of a reaction where the following are involved
Catalyst
Give an example of the following chemical change.
A reaction where colour change is noticed
Write the chemical reaction where the following changes are observed.
Precipitate is formed
Give reason for the following:
Molybdenum is used in the manufacture of ammonia.
Explain,giving one example of the following chemical changes:
Reversible reaction
Multiple choice:
Thermal decomposition of sodium carbonate will produce
What do you observe? When
Water is added to the quick lime.
State the original colour of the following substance and colour of residue obtained after heating.
Copper carbonate
Distinguish by dilute sulphuric acid.
Copper and magnesium?
When an aqueous solution of potassium chloride is added to an aqueous solution of silver nitrate, a white precipitate is formed. Give the chemical equation of this reaction.
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.
Give two examples for the following case:
Chemical changes
If you leave a piece of iron in the open for a few days, it acquires a film of brownish substance, called rust.
Can you change rust back into iron by some simple method?
Write the chemical reaction of baking soda with lemon.
Assertion (A): Cutting paper into very small pieces is an irreversible change.
Reason (R): Physical changes are always reversible.
