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प्रश्न
With the help of an appropriate example, justify that some of the chemical reactions are determined by Change in colour
Give chemical equation for the reaction involved in the above case.
Give one example of a chemical reaction characterised by change in colour.
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उत्तर
When sulphur dioxide gas is passed through acidified potassium dichromate solution, orange colour of potassium dichromate solution changes to green colour.
\[\ce{3SO2(g) + K2Cr2O7(aq) + H2SO4(aq)->K2SO4(aq) + Cr2(SO4)3(aq) + H2O(I)}\]
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संबंधित प्रश्न
Give one example of a chemical reaction.
Aluminium hydroxide reacts with sulphuric acid to form aluminium sulphate and water. Write a balanced equation for this reaction.
Write word equation for the following skeletal equation:
\[\ce{FeCl2 + Cl2 -> FeCl3}\]
Write word equation for the following skeletal equation:
\[\ce{KNO3 -> KNO2 + O2}\]
What information do you get from the equation H2+ Cl2 → 2HCl ?
Write your observation for the following chemical reaction and name the product formed:
When sugar is heated.
Balance the following equation. Also name the product formed.
`"KCIO"_3 → "KCI" +"O"_2`
Balance the equation stepwise.
H2S2O7(l) + H2O(l) → H2SO4(l)
Balance the equation stepwise.
SO2(g) + H2S(aq) → S(s) + H2O(l)
Balance the following equation:
C + H2SO4 → CO2 + H2O + SO2
Write the balanced chemical equation of the following reaction.
Potassium permanganate + hydrochloric acid → potassium chloride + manganese chloride + chlorine + water
In certain reaction an insoluble solid called precipitate is formed. State the colour and name of the precipitate formed in the following reaction involving addition of:
Dilute hydrochloric acid to silver nitrate.
In certain reaction an insoluble solid called precipitate is formed. State the colour and name of the precipitate formed in the following reaction involving addition of:
Lead nitrate to ammonium hydroxide.?
Balance the following simple equation:
Al + N2 → AlN
Balance the following simple equation:
H2S + Cl2 → S + HCl
Balance the following simple equation:
Zn + NaOH → Na2ZnO2 + H2
CaCO3 + 2HCl[dil.] → CaCl2 + H2O + CO2 [g]
State the information provided by the above chemical equation.
Fill in the blank with the correct word from the options given below:
A chemical equation is a shorthand form for a _______ change.
Balance the following chemical equation.
- Na + O2 → Na2O3
- Ca + N2 → Ca3N2
- N2 + H2 →NH3
- CaCO3 +HCl → CaCl2 + CO2 +H2O
- Pb(NO3)2 → PbO + NO2 + O2
Which among the following statement(s) is(are) true? ‘Exposure of silver chloride to sunlight for a long duration turns grey due to
- The formation of silver by the decomposition of silver chloride.
- sublimation of silver chloride.
- decomposition of chlorine gas from silver chloride.
- oxidation of silver chloride.
