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Physical and Chemical Changes

The mixture o...

Question

The mixture of iron fillings and sulphure is heated and then mixed with 2ml carbon di suphide, what will be the resultant colour?

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Solution

When we heat the mixture of iron fillings and sulphur in 2ml of disulphide a black colour is obtained in the resultant as a ppt this black colored ppt is known to form is FeS ( ironsulphide )
The chemical reaction can be written as
Fe + S + CS₂ --> Fes ( black colour ppt)

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Q. A student was given a mixture of sulphur and iron fillings. He was told to heat the mixture and observe. What will be the colour of the compound formed?

Q. While doing an experiment, iron fillings and sulphur powder are mixed properly in a container and then the mixture is heated. Explain which gas is being evolved.

Q. Ramesh mixed some iron filings with sulphur powder in a China dish. In another dish, he mixed iron filings and sulphur powder and heated the mixture. Which of his observations is not correct?

Q. The correct procedure of heating iron-sulphur mixture to prepare iron sulphide is :
(1) heat the powder mixture at the base of the test tube using a blue flame throughout.
(2) heat the iron filings and sulphur mixture in the middle of the test tube using yellow flame throughout.
(3) heat the powder mixture at the top of the test tube using an orange flame throughout.
(4) heat the iron fillings-sulphur mixture at 3/4 quarters of the test tube using a red flame throughout.

Q. Calculate standard heats of formation of carbon-di-sulphide

(l)

. Given the standard heat of combustion of carbon

(s)

(s)

and carbon-di-sulphide

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- 393.3, - 293.72

- 1108.76 k J

{m o l}^{- 1}

respectively (only magnitude in nearest integer in kJ).

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