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Q337) Titanium shows a magnetic moment of 1.73 B.M in its compound. What is the oxidation number of Ti in the compound? [ DPMT 2002]




SOLUTION


Answer: (c)


Q338) Number of electrons transferred in each case when KMnO4 acts as an oxidising agent to give MnO2, Mn2+ , Mn(OH)3 and MnO42- are respectively .. [ AIEEE 2002]




SOLUTION


Answer: (a)


Q339) The black compound formed during the reaction between sodium thiosulphate and silver nitrate is [ Tamil nadu 2002]



SOLUTION

2AgNO3 + Na2S2O3 → ag2S2O3 + 2NaNO3
Ag2S2O3 + H2O → H2SO4 + Ag2S(black)
Answer:(b)



Q340) How many moles of acidified FeSO4 solution can be completely oxidised by one mole of KMnO4? [ EAMCET 2001]



SOLUTION

2KMnO4+ 3H2SO4 → K2SO4 +2MnSO4 + 3H2O + 5(O)
[2FeSO4 + H2SO4 + (O) → Fe2(SO4)3 + H2] ×5
From above equations , it is clear that 2 moles of KMnO4 oxidise 10 moles of FeSO4 completely
∴ 1 mole of KMnO4 will oxidise 5 moles of FeSO4 completely
Answer: (b)


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