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Roasting of sulphides gives the gas X as...

Roasting of sulphides gives the gas X as a by-product. This is a colourless gas with choking smell of burnt sulphur and causes great damage to respiratory organs as a result of acid rain. Its aqueous solution is acidic acts as a reducing agent and its acid has never insolated. The gas X is

A

`SO_2`

B

`CO_2`

C

`SO_3`

D

`H_2S`

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The correct Answer is:
A
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Compound (A) on reaction with iodine in the solvent diglyme gives a hydride (B) and hydrogen gas. The product (B) is instantly hydrolysed by water or aqueous alkali forming compound ( C) and liberating hydrogen gas. The compound ( C) in aqueous solution behaves as a week mono basic acid. But in presence of certain organic polyhydroxy compound behaves as a strong monobasic acid. The hydride (B) in air catches fire spontaneously forming oxide which gives coloured beads with transition metal compounds. Which of the following statement is correct for the hydride (B) ?

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An element 'X' having green colour and with seven molecules of water of crystallisation was heated strongly to leave a solid residue "Y". This Y reacts with conc. nitric acid to form a nitrate 'Z'. This nitrate reacted with hydrochloric acid to form a chloride 'A'. When hydrogen sulphide was passed into Its aqueous solution a black compound B was precipitated. Identify X, Y, Z, A and B and also give the equation involved.

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AAKASH INSTITUTE ENGLISH-GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS-Assignment (Section-C) Previous Years Question
  1. Which of the following does not contain aluminium?

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  2. Which of the following does not contain Mg?

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  3. Carborundum is

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  4. In the basic Bessemer process for the manufacture of steel, the lining...

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  5. Mond's process is used for

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  6. Which process of purification is represented by the following reaction...

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  7. Which of the following sulphides when heated strongly in air gives the...

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  8. The most important ore of tin is

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  9. Heating of ore in presence of air to remove sulphure impurities is cal...

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  10. The process used for the extraction of sodium is called :

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  11. Among the metals Cr,Fe,Mn,Ti,Ba, and Mg, the one that cannot be obtain...

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  12. Chemical used as a depressant in separatin ZnS from PbS in froth-float...

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  13. The ore that contains both iron and copper is: a. malachite b. dolomit...

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  14. To dissolve argentite ore which of the following is

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  15. The iron obtained from the blast furnace is called:

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  16. How are metals used as semiconductors refined ? What is the principle ...

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  17. Which of the following oxide is least stable?

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  18. The underlying of blast furnace is made of

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  19. Roasting of sulphides gives the gas X as a by-product. This is a colou...

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  20. Which of the following mineral contains calcium as well as magnesium ?

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