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Q89) On boiling an aqueous solution of KClO3 with iodine the following product is obtained? [ NCERT 1980]




SOLUTION

ClO3- ion being an oxidising agent oxidise I2 to IO3- ion and itself gets reduced to Cl2
Answer: (a)


Q90) Which of the following has greatest reducing power




SOLUTION


Answer: (a)


Q91) Which member of halogen family (X2 does not show positive oxidation state (X2+



SOLUTION

Due to non availability of d-orbitals F does not show positive oxidation states
Answer:(a)



Q92) A 500gm toothpaste sample has 0.2gm fluoride concentration. What is the concentration of F- ions in terms of ppm level [ AIIMS 1992]



SOLUTION

0.2 gm = 200 mg
1mg per kg is 1ppm
Thus 200 mg in 500 gm = 400ppm
Answer: (c)


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