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Q25) Chlorine dioxide is best prepared by passing dry .. [ Kerala MEE 2003]




SOLUTION

2AgClO3 + Cl2 → 2AgCl + 2ClO3 + O2
Answer: (d)


Q26) Which one of the following elements shows different oxidation states? [ EAMCET 2001]




SOLUTION

Chlorine shows different oxidation states form -1 to +1, +3, +5 and +7
Answer: (c)


Q27) The correct decreasing order of acidic character is ... [ Chd. CET 2000]



SOLUTION

Acidity decreases in halogen as we go from Cl to I , Note acidity of HBr < HCl
Answer:(a)



Q28) Which of the following reaction involves oxidation and reduction? [ EAMCET 1999]



SOLUTION

In the reaction H2 + Br2 → 2HBr
H2 is oxidised to H+ and Br2 is reduced to Br-
Answer: (a)


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