Chemistry 1st Paper CQ-Dinajpur Board-2023

What is P-block elements?

Why $\mathrm{pH}$ scale is limited between $0-14$ ?

Determine the concentration of $\mathrm{Cl}^{-}$ion of pot-P?

Analyze the probability of difference in solubility of $\mathrm{AgCl}$ in pot-P and Pot-Q of the stem.

What is called saturated solution?

Why the value of equilibrium constant $\mathrm{K}_{\mathrm{C}}$ is not zero?

The bond angles of the hydrides of ' $\mathrm{X}$ ' and ' $\mathrm{A}$ ' are different-Explain.

Analyze logically the curve of the stem does not show ideal periodic property.

What is called ionic product of water?

Why preservatives are used in food preservation?

Only one quantum number is different for delectrons of element A-Explain.

Analyze mathematically, the probability of formation of precipitation of $\mathrm{A}(\mathrm{OH})_{3}$ from mixed solution of the stem.

Write down the Hund's rule.

Why $\mathrm{H}_{2} \mathrm{O}$ liquid but $\mathrm{H}_{2} \mathrm{~S}$ is gas in normal temperature?

Calculate the $\mathrm{K}_{\mathrm{C}}$ of the reaction of the stem.

Will the dissociation change if pressure is doubled? Explain mathematically.

What is called food safety?

Why 3f orbital is not possible?

Write down the identification test for the positive ion of $\mathrm{Q}$ compound with reaction.

Analyze mathematically, whether the $\mathrm{pH}$ value of mixed solution of container-1 and 2 will be changed or not by adding of a little amount of acid or base.