Chemistry 1st Paper CQ-Cumilla Board-2021

What is magnetic quantum number?

The electronic configuration of $\mathrm{Cr}$ is an exception. Why?

According to the stem in between $\mathrm{XCl}$ and $\mathrm{YCl}$ which one is more soluble in water? Explain.

Though the 1st ionization potential of 'A' of the stem is greater than ' $\mathrm{B}$ ', but 2nd ionization potential is less. Explain.

What is chemical equilibrium?

Whose electron affinity is more between $\mathrm{F}$ and $\mathrm{Cl}$.

What type of hybridization occurs in figure-2? Explain.

Although both compounds of the pictures have the same hybridization but the bond angles are different. Analyze.

What is hydrogen bond?

In between ortho-nitrophenol and para-nitrophenol, who has higher melting point and why?

How can prepare ' $\mathrm{B}$ ' from ' $\mathrm{A}$ ' of the stem? Explain.

Describe the food preservation mechanism of the compound 'B'.

What is vinegar?

Which is stronger between $\mathrm{H}_{3} \mathrm{PO}_{4}$ and $\mathrm{HNO}_{3}$ ? And why?

Determine what amount of compound (i) will be precipitated when it is cooled at $15^{\circ} \mathrm{C}$.

Explain the reasons of changes of solubility of the compounds mentioned in the stem.

What is polarization?

Between $\mathrm{Na}$ and $\mathrm{Na}^{+}$, which is larger and why?

Calculate the $\mathrm{pH}$ value of $0.001 \mathrm{M} ~~\mathrm{‘Y’}$ of the stem.

Deduce the equation for $K_{p}$ from the reaction where ' $X$ ' of the stem is produced.