Chemistry 2nd Paper CQ-Barishal Board-2019

What is called nitrogen fixation?

Standard hydrogen electrode is a primary reference electrode-Explain it.

Explain the rule which support the stem reaction.

Through both $\mathrm{A}$ and $\mathrm{B}$ exhibits stereo isomerism but there are difference in that - Evaluate it.

What is Nano-particle?

Why $\mathrm{NaOH}$ cannot be called primary standard substance?

Determine the RMS velocity of A at STP.

Analyze the reason behind the difference in molar volume of $A$ and $B$.

What is clinker?

Why is the pressure of a gas increased with increase the temperature?

How do you differentiate between A and C? Explain with equations.

Explain the mechanism of the preparation of D.

What is semi-molar solution?

Write down the difference between starch and cellulose.

Determine the concentration of $A$ solution of the stem in PPM unit.

Calculate the $\mathrm{pH}$ of $\mathrm{A}$ and $\mathrm{B}$ mixture solution of the stem.

What is free-radical?

What is the importance of salt-bridge in electrolytic cell?

Balancing the reaction of $\mathrm{A}$ and reducing agent of the stem in ion-electron method.

To oxidize the reducing agent how much volume are needed of $\mathrm{KMnO}_{4}$ ? Mathematically explain it.