Question

How many moles of iodine are liberated when 1 mole of potassium dichromate reacts with potassium iodide?
A. 1
B. 2
C. 3
D. 4

Answer 1

`K_(2)Cr_(2)O_(7) + 4H_(2)SO_(4) rarrK_(2)SO_(4) + Cr_(2)(SO_(4))_(3) + 4H_(2)O+ 3(O)`
`ul2KI + H_(2)SO_(4) + (O) rarrK_(2)SO_(4) + I_(2) + H_(2) O ] xx3)`
`K_(2)Cr_(2)O_(7) + 7H_(2)SO_(4)+ 6KI rarr 4K_(2)SO_(4) + Cr_(2)(SO_(4))_(3) + 7GH_(2)O + 3I_(2)`