Chemistry 2nd Paper MCQ-Sylhet Board-2017

1. $\mathbf{C H}_{2}=\mathrm{CHBr}+\mathrm{HBr} \rightarrow \text { Product. }$

What is the type of the stem's reaction?

2. Which salt is used in salt-bridge?

3. Which one is the criteria of surface water purity in agricultural purpose?

4. What is the value of $R$ in $S I$ unit?

5. $M\left[M^{2+}\left[\mathbb{N}^{+} \mathbb{N}\right.\right.$

$\mathrm{E}_{\mathrm{MM}^{2+}}^{\circ}=0.76$ Volt, $\mathrm{E}_{\mathrm{NF}^{+}}^{\circ}=-0.4$ Voht

The 'M' metal in the cell -

i. gets reduced

ii. acts as an anode

iii. more reactive than $\mathrm{N}$

Which one is correct?