1) What happens to iodine when iodate ions, IO3-, are converted to iodine molecu

ID: 505883 • Letter: 1

Question

1) What happens to iodine when iodate ions, IO3-, are converted to iodine molecules, I2?

A - It undergoes reduction and it's oxidation numbers changes from -1 to 0

B - It undergoes oxidation and it's oxidation numbers changes from -1 to 0

C - It undergoes reduction and it's oxidation numbers changes from +5 to 0

D - It undergoes oxidation and it's oxidation numbers changes from +5 to 0

7) A solution of acid HX has a pH=1 and a solution of acid HY has a pH=3. Which statement must be correct?

A - HX is a stronger acid than HY

B - HY is a stronger acid then HX

C - The [H+] in the solution of HX is 100 times greater than the [H+] in the solution HY

D - The [H+] in the solution of HX is 100 times greater than the [H+] in the solution HX

6. Which row correctly describes 1.0 mol dm-3 NaOH(aq)?

pH Colour in universal indicator solution Electrical conductivity

A 14 purple good

B 10 green poor

C 14 red good

D 10 blue poor

Please give me explaination if u could. Thanks

in IO3- , oxidation state of I is +5

in I2, oxidation state of I is 0

Since oxidation state is decreasing , it is undergoing reduction

Answer: C - It undergoes reduction and it's oxidation numbers changes from +5 to 0

the one with lower pH will have high [H+] but it tells nothing about the strength of acid as [H+] also depends on concentration of acid

A pH change of 1, changes the strength by 10

Here pH changes by 2, so strength of acid differ by 100

Answer: C - The [H+] in the solution of HX is 100 times greater than the [H+] in the solution HY

i am allowed to answer only 1 question at a time

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