Chemistry 1st Paper CQ-Combined Board(Dhaka, Dinajpur, Sylhet, Jessore)-2018

What is vinegar?

Why dewatering of butter is necessary?

Calculate the value of $\mathrm{K}_{\mathrm{p}}$ of reaction no. (ii).

Which reaction yield maximum product with the increase of temperature? Analyse.

What is 4-digit balance?

Explain Pauli exclusion principle.

Explain the role of 'Z' for food canning.

Which compound of the stem is suitable to prepare glass cleaner? Analyse.

What is suspension?

Why the $19^{\text {th }}$ electron of potassium goes to $4 \mathrm{~s}$ orbital instead of $3 \mathrm{d}$ ?

Explain the safe preservation of chemical-A in the laboratory.

"Optimum use of chemical-B in the lab is important for conserving environment"Analyze it/Justify it.

What is ionization potential?

F is the most electronegative element - Explain.

Calculate the pH of the solution of vessel-A.

Will the value of pH change of small amount of HCI is added to vessel-C? Analyse mathematically.

What is Buffer solution?

Heat of neutralization of $\mathrm{NaOH}$ and $\mathrm{HCl}$ is constant-Explain.

Electron affinity of $\mathrm{Y}$ is greater than $\mathrm{X}$ Explain.

Which compound is more ionic between PY and PZ? Analyse.