Chemistry 1st Paper CQ-Combined Board(Rajshahi, Cumilla, Chattogram, Barishal)-2018

What is heat of combustion?

Why $\mathrm{OF}_{6}$ can not be formed?

Calculate the solubility of $\mathrm{Zn}(\mathrm{OH})_{2}$ according to the stem.

Is there any possibility of forming ppt. if we mix the solution of container-1 with container2? Explain.

What is chromatography?

Which one between $\mathrm{Na}^{+}$and $\mathrm{F}^{-}$is big in size?

Why is not water directly added to the chemicals (i) and (iii) of the stem? Explain.

Analyze the impact on environment for the excess uses of the chemicals of the stem.

What is ionization potential?

Which one is more stronger acid between $\mathrm{HNO}_{3}$ and $\mathrm{H}_{3} \mathrm{PO}_{4}$ ? Explain.

Calculate the $\mathrm{pOH}$ value of the solution of $\mathrm{A}$ vessel of the stem.

Analyze whether the $\mathrm{pH}$ value of the solution of $\mathrm{B}$ vessel will be changed or not by adding of a little amount of strong acid or strong base.

What is anti oxidant?

Activation energy affects the rate of reaction - Explain.

Calculate the total electrons of Z shell on the basis of the value of $I$ and $m$.

In which region of electromagnetic radiation is the emitted wavelength for the transition of electron of the stem found? Evaluate mathematically.

What is fractional distillation?

Why is the value of Rfless than 1 ?

Explain hybridization of central atom of hydride compound of $A$.

The bond angles of hydride compounds of $B$ and $\mathrm{C}$ are different - Analyze.