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The acidified potassium manganate (VII) turns from purple to colourless since sulphur (IV) oxide reduces manganate (VII) ions to manganese ions.
johnmulu answered the question on February 7, 2017 at 09:37
- Acidified potassium manganate (VII) solution is delocourised when sulphur (VI) oxide is bubbled through it. The equation for the reaction is given below(Solved)
Acidified potassium manganate (VII) solution is delocourised when sulphur (VI) oxide is bubbled through it. The equation for the reaction is given below
$2H_2O(l) + 5SO_2(g) + 2KMnO_4(aq) \rightarrow K_2SO_4(aq) + 2MnSO_4(aq) + 2H_2SO_4(aq)$
a) Which reactant is oxidized? Explain
b) Other than the manufacture of sulphuric (IV) acid, state one other use of Sulphur (IV) oxide
Date posted: February 7, 2017. Answers (1)
- Name two reagents that can be used to prepare hydrogen sulphide in the laboratory(Solved)
Name two reagents that can be used to prepare hydrogen sulphide in the laboratory
Date posted: February 7, 2017. Answers (1)
- Crude oil contains sulphur. What would be effect to the environment of using fuel containing sulphur?(Solved)
Crude oil contains sulphur. What would be effect to the environment of using fuel containing sulphur?
Date posted: February 7, 2017. Answers (1)
- State the observation made at the end of the experiment when a mixture of iron powder and sulphur is heated in a test tube (Solved)
a) State the observation made at the end of the experiment when a mixture of iron powder and sulphur is heated in a test tube
b) When a mixture of iron powder and sulphur is heated, it glows more brightly than that of iron fillings and sulphur. Explain this observation
Date posted: February 7, 2017. Answers (1)
- Suggest a reason why BaSO4 (A pigment made from sulphuric (VI) acid would be suitable in making paint for cars)(Solved)
Suggest a reason why BaSO4 (A pigment made from sulphuric (VI) acid would be suitable in making paint for cars)
Date posted: February 7, 2017. Answers (1)
- Name one fertilizer made from sulphuric (IV) acid(Solved)
Name one fertilizer made from sulphuric (IV) acid.
Date posted: February 7, 2017. Answers (1)
- When hydrogen sulphide gas was bubbled into an aqueous solution of iron (III) chloride, a yellow precipitate was deposited.(Solved)
When hydrogen sulphide gas was bubbled into an aqueous solution of iron (III) chloride, a yellow precipitate was deposited.
a) State another observation made
b) Write an equation for the reaction that took place
c) What type reaction was undergone by hydrogen sulphide in this reaction?
Date posted: February 7, 2017. Answers (1)
- In an experiment to study the properties of concentrated sulphuric (IV) acid, a mixture of the acid and wood charcoal was heated in a boiling tube(Solved)
In an experiment to study the properties of concentrated sulphuric (IV) acid, a mixture of the acid and wood charcoal was heated in a boiling tube.
a) Write the equation of the reaction that took place in the boiling tube
b) Using oxidation numbers, show that reduction and oxidation reactions took place in the boiling tube.
Date posted: February 7, 2017. Answers (1)
- In an experiment, a gas jar containing moist sulphur (IV) oxide was inverted over another gas jar containing hydrogen sulphide gas.(Solved)
In an experiment, a gas jar containing moist sulphur (IV) oxide was inverted over another gas jar containing hydrogen sulphide gas.
a) state and explain the observation that was made
b) state the precaution that should be taken when carrying out this experiment
Date posted: February 7, 2017. Answers (1)
- Oleum (H2S2O7)is an intermediate product in the industrial manufacture of sulphuric acid(Solved)
Oleum (H2S2O7)is an intermediate product in the industrial manufacture of sulphuric acid.
a) How is oleum converted into sulphuric (VI) acid
b) Give one use of sulphuric (VI) acid
Date posted: February 7, 2017. Answers (1)
- Sulphur exists in two crystalline forms (a) Name one crystalline form of sulphur(Solved)
Sulphur exists in two crystalline forms
a) Name one crystalline form of sulphur
b) Give any two uses of sulphur
Date posted: February 6, 2017. Answers (1)
- In an experiment, sulphur (IV) oxide gas was bubbled into water followed by chlorine gas. The resulting clear solution gave a white precipitate when mixed with acidified barium chloride solution(Solved)
In an experiment, sulphur (IV) oxide gas was bubbled into water followed by chlorine gas. The resulting clear solution gave a white precipitate when mixed with acidified barium chloride solution. Explain these observations.
Date posted: February 6, 2017. Answers (1)
- When a sample of concentrated sulphuric (IV) acid was left in an open beaker in a room for two days, the volume was found to have increased slightly.(Solved)
When a sample of concentrated sulphuric (IV) acid was left in an open beaker in a room for two days, the volume was found to have increased slightly.
a) What property of concentrated sulphuric (IV) acid is shown by the above reaction
b) State one use of concentrated sulphuric (IV) acid that depends on the property named
Date posted: February 6, 2017. Answers (1)
- Describe a simple laboratory experiment that can be used to distinguish between sodium sulphide and sodium carbonate(Solved)
Describe a simple laboratory experiment that can be used to distinguish between sodium sulphide and sodium carbonate.
Date posted: February 6, 2017. Answers (1)
- A certain matchstick head contains potassium chlorate and sulphur. On striking, the two subtances react to produce sulphur (IV) oxide and potassium chloride(Solved)
A certain matchstick head contains potassium chlorate and sulphur. On striking, the two subtances react to produce sulphur (IV) oxide and potassium chloride. Explain the environmental effect of using such matches in large numbers.
Date posted: February 6, 2017. Answers (1)
- When a solid sample of sulphur is heated in a test tube, it changes into a liquid which flows easily(Solved)
When a solid sample of sulphur is heated in a test tube, it changes into a liquid which flows easily. On further heating, the liquid darkens and does not flow easily. Explain these observations.
Date posted: February 6, 2017. Answers (1)
- In an attempt to prepare sulphur (IV) oxide gas, dilute sulphuric (VI) acid was reacted with barium sulphite(Solved)
In an attempt to prepare sulphur (IV) oxide gas, dilute sulphuric (VI) acid was reacted with barium sulphite. The yield of sulphur (IV) oxide was found to be negligible. Explain
Date posted: February 6, 2017. Answers (1)
- State and explain the observation that would be made when a few drops of concentrated sulphuric (VI) acid are added to a small sample of hydrated copper (II) sulphate.(Solved)
State and explain the observation that would be made when a few drops of concentrated sulphuric (VI) acid are added to a small sample of hydrated copper (II) sulphate.
Date posted: February 6, 2017. Answers (1)
- State what would be observed when dilute hydrochloric acid is added to the products formed when a mixture of iron filling and sulphur is heated (Solved)
State what would be observed when dilute hydrochloric acid is added to the products formed when a mixture of iron filling and sulphur is heated.
Date posted: February 6, 2017. Answers (1)
- On heating a pale green solid K, carbon (IV) oxide gas and black solid M were formed. On reacting K with dilute hydrochloric acid, carbon (IV) oxide gas and green solution S were formed(Solved)
On heating a pale green solid K, carbon (IV) oxide gas and black solid M were formed. On reacting K with dilute hydrochloric acid, carbon (IV) oxide gas and green solution S were formed. When excess aqueous ammonia was added to solution S, a deep blue solution was formed.
a) Identify the cation in solid K
b) Identify the two anions in solution S
Date posted: February 6, 2017. Answers (1)