Advertisements
Advertisements
प्रश्न
An acid which can decolourise purple coloured potassium permanganate solution is ______.
विकल्प
sulphuric acid
citric acid
carbonic acid
hydrochloric acid
Advertisements
उत्तर
An acid which can decolourise purple coloured potassium permanganate solution is citric acid.
Explanation:
Potassium permanganate (KMnO4) is a very powerful oxidising agent with a distinct deep purple colour. When citric acid (a reducing agent) is added to it, a redox reaction occurs where the purple permanganate ions \[\ce{(MnO^-_4)}\] are reduced to manganese ions (Mn2+). Because manganese (Mn2+) ions are completely colourless in solution, the entire mixture loses its purple tint and becomes clear.
APPEARS IN
संबंधित प्रश्न
Translate the following statement into a chemical equation and then balance the equation:
Aluminium metal replaces iron from ferric oxide, Fe2O3, giving aluminium oxide and iron.
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.
Which of the following is not an endothermic reaction?
What happens when silver nitrate solution is added to sodium chloride solution?
Write the equation for the reaction which takes place.
Balance the following equation. Also name the product formed.
` "H"_2"O"_2 → "H" _2 "O" + "O"_2`
Complete the following equation:
CH3COOH + NaOH →
Raisins are wiped off gently before final weighing with the help of
Balance the following equation:
\[\ce{S + HNO3 -> H2SO4 + NO2 + H2O}\]
Balance the following equation:
HNO3 + H2S → NO2 + H2O + S
Write the balanced chemical equation of the following reaction.
potassium bicarbonate + sulphuric acid → potassium sulphate + carbon dioxide + water
When a potassium iodide solution is added to a solution of lead (II) nitrate in a test tube, a precipitate is formed.
What is the colour of this precipitate? Name the compound precipitated.
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 reason for the following:
Silver salts are kept in dark coloured bottles.
Write word equation for the following chemical reaction given below. Also state the observation seen in the case.
NaCl + AgNo3 → AgCU ↓ + NaN03
Balance the following simple equation:
K + CO2 → K2O + C
Balance the following simple equation:
NaHCO3 + H2SO4 → Na2SO4 + H2O + CO2
With reference to a chemical equation state which of the statements 1 to 5 pertain to A or B.
A: Information provided by a chemical equation.
B: Limitations of a chemical equation.
- The nature of the individual elements.
- The speed of the reaction.
- The state of matter in which the substance is present.
- The completion of the reaction.
- The direction of the reaction.
Give a balanced equation by the partial equation method, [steps are given below].
Oxidation of Lead [II] Sulphide by Ozone
- Ozone first decomposes to give molecular oxygen & nascent oxygen.
- Nascent oxygen then oxidises lead [II] sulphide to lead [II] sulphate.
Underline the compound in the equation given below, it is incorrectly balanced and write the correct balancing for the same.
Fe2O3 + 2H2 → 2Fe + 3H2O
Underline the compound in the equation given below, it is incorrectly balanced and write the correct balancing for the same.
C2H5OH + 3O2 → 2CO2 + 2H2O
