Mention the colour of FeSO4.7H2O crystals. How does this colour change upon heating ? Give balanced chemical equation for the change.
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Why freshly prepared FeSO4 is used in nitrogen testing?
Because FeSO4 gets hydrolysed if its solution is stored for long.
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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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Write the chemical equation of the reaction with an example each in which the following change has taken place: (i) Change in colour
(i) Change in colour: Reaction between lead nitrate solution and potassium iodide solution. Pb(NO3)2(aq)+2KI → PbI2(s)+2KNO3(aq) In this reaction, colour changes from colourless to yellow. (ii)Change in temperature: Action of dilute sulphuric acid on zinc. Zn(s)...
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While performing an experiment a student observes that when he heats some green crystals in a boiling tube, the colour
Observation: The green colour of ferrous sulphate crystals changes to brownish black ferric oxide and smell of burning sulphur is observed. Result: Heating of ferrous sulphate is a thermal decomposition reaction because of ferrous sulphate breaks down into simpler compounds-Fe2O3, SO2 and SO3. 2FeSO4(s) +Heat → Fe2O3(s) +...
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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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Crystals of a substance changed their colour on heating in a closed vessel but regained after sometime, when they were allowed to cool down.
(i) CuSO4.SH2O CuSO4.5H2O Heat →CuSO4+5H2O CuSO4.5H2O-(Blue) CuSO4+5H2O-(White) (ii) Explanation: On heating, crystal loses water of crystallisation and regain it on cooling
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Crystals of a substance changed their colour on heating in a closed test-tube but regained it after sometime when they were allowed
Copper sulphate crystals (CuSO4.5H2O) 5 molecules of water are present in one formula unit of copper sulphate. When heated, its loses its water and salt turns white.
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Give suitable reasons The crystals of washing soda change to white powder on exposure to air.
Washing soda is sodium carbonate decahydrate. which when exposed to air loses 10 molecules of water and changes to white powder.
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An excess of potassium ions makes KCl crystals appear violet or lilac in colour since ________.
(i) some of the anionic sites are occupied by an unpaired electron. (iv) F-centres are created which impart colour to the crystals.
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A student heated a few crystals of copper sulphate in a dry boiling tube. (a) What will be the color of the copper sulphate after heating?
(a) White (b) Yes (c) Copper sulphate crystals which seem to be dry contain water of crystallization.
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