Chemistry 2nd Paper MCQ-Barishal Board-2019

1. In acidic media, how many electron is accepted by $\mathrm{KMnO}_{4}$ ?

2. $\mathrm{Fe}^{2+}+\mathrm{Cr}_{2} \mathrm{O}_{7}^{2^{-}}+\mathrm{H}^{+} \longrightarrow \mathrm{A}+\mathrm{Cr}^{3+}+\mathrm{H}_{2} \mathrm{O}$

How much $\mathrm{mL}$ decimole solution of reducing agent is required to reduce $20 \mathrm{~mL} 0.04 \mathrm{M}$ solution of oxidising agent in the stem?

3. What is the RMS velocity of Oxygen is $\mathrm{ms}^{-1}$ at SATP?

4. Which one is conjugate base of $\mathrm{OH}^{-}$?

5. In which reaction carbon chain can be increased?