Chemistry 1st Paper CQ-Dinajpur Board-2017

What is orbital-hybridisation?

Why is the first ionisation potential of nitrogen higher than that of oxygen?

Describe with equations the preparation of $A$ compound from compound B.

Which of the compounds between A and B is more suitable for fish preservation? Analyse.

What is first aid box?

The value of neutralization enthalpy of $\mathrm{NaOH}$ and HF is higher than the constant value. Why?

Calculate the mass of $\mathrm{H}_{2} \mathrm{SO}_{4}$ in container A.

Which of the glass-ware are essential for quantitative analysis? Analyse.

What are vander waals forces?

Between $\mathrm{CaCl}_{2}$ and $\mathrm{AlCl}_{3}$ salts, which one is more water-soluble? Why?

Hydrogen bonding is principally responsible for the physical states of $\mathrm{DH}_{4}$ and $\mathrm{H}_{2} \mathrm{R}$ - explain.

Analyse the reasons for the variation of shapes of three hydride molecules of the elements mentioned in the stem.

What is green chemistry?

How can you identify $\mathrm{Al}^{3+}$ ion in solution?

Calculate the $\mathrm{pH}$ of mixture $(\mathrm{B}+\mathrm{C})$.

What will be the nature of solution $(A+B)$ ? Explain.

What is food safety?

Between $\mathrm{HClO}_{4}$ and $\mathrm{HBrO}_{4}$ which one is more acidic? Explain.

Determine the solubility of $\mathrm{SrF}_{2}$ in container $\mathrm{B}$.

Explain the reason for the difference of value of solubility of $\mathrm{SrF}_{2}$ in container $\mathrm{A}$ and $\mathrm{B}$.