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प्रश्न
Give an example of the following chemical changes.
A reaction involving
(i) Change of state
(ii) formation of precipitate
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उत्तर
(i) Change of state
Ammonia gas reacts with HCl gas to give solid ammonium chloride.
NH3(g) + HCl(g) ⇋ NH4Cl(s)
(ii) Formation of precipitate
When a solution of silver nitrate is added to a solution of sodium chloride, a white insoluble substance, silver chloride, is formed.
AgNO3(aq) + NaCl(aq) → AgCl(aq) + NaNO3(aq)
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संबंधित प्रश्न
Give reason .
A person suffering from acidity is advised to take an antacid.
MULTIPLE CHOICE QUESTIONS
Tick the most appropriate answer.
Which one of the following alters the rate of the chemical reaction without itself undergoing any change?
- temperature and Pressure
- concentration of reactants
- presence of catalyst
- none of these
FILL IN THE BLANK
In a ............ change, new substances are formed.
Balancing a chemical equation is based on
Explain the term reactant and product giving examples.
Complete and balance the following reaction:
\[\ce{NH3 + O2 ->[\Delta]}\]
Distinguish by heating the following in dry test tubs.
Ammonium Chloride and iodine.
Distinguish by dilute sulphuric acid.
Copper and magnesium?
State the following reaction represent oxidation or reduction.
\[\ce{Fe++->Fe+++}\]
Assertion: The formation of iron oxide from iron is a chemical change.
Reason: For the rust to form from iron, it must be exposed to air and water.
