Q28 of 79 Page 3

(i) What is the colour of potassium dichromate solution?
(ii) What is the colour of Cr3+ ion?
(iii) What property of SO2 is responsible for bringing change of colour of potassium dichromate?

(i) Potassium dichromate solution is orange yellow colour.(ii) The colour of Cr3+ ion is green.(iii) Reducing property of sulphur dioxide is responsible to change the orange yellow colour of K2Cr2O7 to green colour.

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26 Explain
i) Why sugar chars (turns black) when conc. H2SO4 is added to it?
ii) What is the blue colour of crystalline copper sulphate due to? 27 Write chemical equations for reactions taking place when
i. Zinc carbonate is calcined.
ii. Ammonia gas is passed over heated copper (II) oxide. 29 How is chloride of lime chemically different from calcium chloride? Why does chloride of lime gradually lose its chlorine when kept exposed to air? 30 Write short notes on the bleaching action of sulphur dioxide.