Question

Change in colour of acidic solution of potassium dichromate by breath is used to test drunken drivers. Change in colour is due to complexation of alcohol with potassium dichromate.

• A. If both assertion and reason are true and reason is the correct explanation of assertion
• B. If both assertion and reason are true but reason is not the correct explanation of assertion
• C. If assertion is true but reason is false
• D. If both assertion and reason are false

Answer 1

Answer: (C)

If assertion is true but reason is false

Answer 2

Potassium dichromate react with alcohol and the reduction of potassium dichromate takes place and dichromate (orange red) change of $Cr ^{3+}$ (green) $Cr _{2} O _{7}^{2-}+14 H ^{+}+6 e ^{-} \longrightarrow 2 Cr ^{3+}+7 H _{2} O$ So, the reason is false.