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Q17) Which of the following is used to absorb suphur dioxide. [ EAMCET 1980]




SOLUTION

KOH absorbs SO2 to form as salt
SO2 + KOH → K2SO3 + H2O
Answer: (b)


Q18) Which oxides of nitrogen is used as a catalyst in the lead chamber process for manufacture of H2SO4




SOLUTION


Answer: (a)


Q19) The oxidation states of the most electronegative element in the products of the reaction of BaO2 with dil. H2SO4 are [ IIT 1991]



SOLUTION

BaO2 + H2SO4 → BaSO4 + H2O2
Most electro negative element is Oxygen , Oxygen have -2 oxidation state in in BaSO4, while in H2O2 oxidation state is -1
Answer:(c)



Q20) Bleaching action of SO2 is due to .. [ CPMT 1986]



SOLUTION

In presence of moisture, SO2 bleaches due to reduction
SO2 + 2H2O → H2SO4 + 2H
and the bleaching is temporary. The colour is restored when bleach article is exposed to air
Answer: (a)


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