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प्रश्न
Give one example of a chemical reaction characterised by the formation of a precipitate.
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उत्तर
When potassium iodide is added to a lead nitrate solution (colourless and clear), a yellow precipitate of lead iodide is formed.
\[\ce{Pb(NO3)2_{(aq)} + 2KI_{(aq)} -> PbI2_{(s)} + 2KHO3_{(aq)}}\]
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संबंधित प्रश्न
Write the balanced chemical equation for the following reaction.
\[\ce{Calcium hydroxide + Carbon dioxide → Calcium carbonate + Water}\]
Write a balanced chemical equation from the following information:
An aqueous calcium hydroxide solution (lime water) reacts with carbon dioxide gas to produce a solid calcium carbonate precipitate and water.
Give one example of an endothermic reaction.
Name the various types of chemical reactions.
Write word equation for the following skeletal equation:
\[\ce{Ca + O2 → CaO}\]
Balance the following equation Also name the product formed.
`"K" + "CI"_2 → "KCI"`
Balance the following equation. Also name the product formed.
`"CO" + "O"_2 → " CO"_2`
While performing the experiment with raisins to determine the percentage of water absorbed by them, a student made following measurements:
Mass of water in the beaker = 40 g
Mass of raisins before soaking = 5 g
Mass of raisins after soaking for 2 hours = 8 g
Mass of water left in the beaker after the experiment = 35 g
The percentage of water absorbed by raisins is:
\[\ce{MnO2 + 4HCl -> MnCl2 + 2H2O + Cl2}\]
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A chemical reaction is generally accompanied by certain external indications or characteristics. These include – change of – (a) colour (b) state (c) smell (d) evolution of gas (e) formation of precipitate (f) evolution or absorption of heat. With reference to change of colour – state the change in colour seen when the following are heated – zinc carbonate.
A chemical reaction is generally accompanied by certain external indications or characteristics. These include – change of – (a) colour (b) state (c) smell (d) evolution of gas (e) formation of precipitate (f) evolution or absorption of heat. With reference to change of colour – state the change in colour seen when the following are heated – lead [IV] oxide.
Give one example in the case where supplying energy [given below] is necessary for a chemical reaction.
Pressure
Balance the following simple equation:
NO + O2 → NO2
Write a balanced equation for the following word equation:
Iron + Hydrochloric acid → Iron [II] chloride + Hydrogen
Write a balanced equation for the following word equation:
Lead dioxide [lead (IV) oxide] → Lead monoxide + Oxygen
Write an Explanation.
Balanced equations
Write three steps of writing chemical equations with example?
What is called thermolysis reactions?
