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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
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
TRUE \ FALSE
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Fill in the blank:
In some chemical reactions an insoluble ________ is formed when two solutions are mixed.
What do you observe when Cobalt chloride paper is introduced in water vapour.
Name the following:
The type of change physical or chemical involved – ‘during respiration in human beings’.
Give a balanced equation for the conversion of an ammonium salt to a basic gas.
______ is not a chemical change.
Silver metal can displace hydrogen gas from nitric acid.
Write word equations for two chemical reactions with the help of materials given in the box.
| Air, copper sulphate, iron, vinegar, iron oxide, carbon dioxide, iron sulphate, copper, lime water, water |
______ occurs in the absence of air and in the presence of micro-organisms such as yeast.
