Why freshly prepared FeSO4 is used in nitrogen testing?
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Identify the type of reaction in the following example: Fe(s) + CuSO4(aq) → FeSO4(aq) + Cu(s)
It is a displacement reaction.
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An aluminium strip is kept immersed in freshly prepared ferrous sulphate solution taken in a test tube.
Al displaces Fe from FeSO4 and forms Al2(SO4)3 which is colourless. The lower end of the test tube becomes warm.
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FeSO4 solution mixed with (NH4)2SO4 solution in 1 : 1 molar ratio gives the test of Fe^2+ ion but CuSO4 solution mixed
i. 1 : 1 molar mixture of FeSO4 and (NH4)2SO4 forms a double salt, FeSO4.(NH4)2SO4.6H2O (Mohr’s salt) which exists only in solid state. In aqueous solution, it dissociates into ions...
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A freshly prepared radioactive source of half-life 2h emits radiation of intensity which is 64 times the permissible safe level.
(b) The minimum time after which it would be possible to work safely with this source is 12h.
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Why is an organic compound fused with Sodium for testing nitrogen,halogens and sulphur ?
On fusing with sodium metal the elements presents in an organic compounds are converted in to ionic compounds of sodium which are water soluble which can be filtered and detected...
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Why is acetic acid & not nitric acid is used to acidify soda extract for testing of sulphur by lead acetate test?
Lead acetate on reacting with sulphuric acid will give a white ppt of lead sulphate which interferes in the detection of sulphur. (CH3COO )2Pb + H2SO4 ----------> PbSO4 + 2CH3COOH
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Explain the reason for the fusion of an organic compound with metallic sodium for testing nitrogen,
The organic compound is fused with sodium metal to convert these elements which are precent in the covalent form to ionic form
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Write a balanced chemical equation : FeSO4(s) + heat→ Fe2O3(s) + SO2(g) + SO3(g)
2FeSO4(s) + heat→ Fe2O3(s) + SO2(g) + SO3(g)
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Mention the colour of FeSO4.7H2O crystals. How does this colour change upon heating ?
Light green is the Colour of crystalline FeSO4.7H2O. Light green changes to reddish brown or brown upon heating. (i) FeSO4.7H2O+heat → FeSO4+7H2O (ii) 2FeSO4+heat → Fe2O3+SO2+SO3
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What is the colour of FeSO4.7H2O crystals ? How does this colour change upon heating ? Give balanced chemical equation for the changes.
FeSO4.7H2O is green in colour and loses water of crystallisation when it is heated. It is then decomposed to Fe3O, (brown coloured), SO2 and SO3 FeSO4.7H2O + Heat→ FeSO4 + 7H2O 2FeSO4 (s)+Heat → FeSO4 +SO2(g) +SO3(g)
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