UNIZIK Chemistry 2020/2021 Past Questions

Calculate the molecular formula of a hydrocarbon with molar mass 26 and 92.3% of Carbon.

Which of these can be used in removing oil stains?

The position of equilibrium in a reversible reaction is affected by

Kipp's apparatus is used for the laboratory preparation of ___.

Tollen reagent is used to differentiate between which pairs of organic compounds?

The solubility of solids increases with an increase in the temperature of solvent. Which of the following salts has its solubility unaffected with a rise in temperature?

On exposure to the atmosphere, a hydrated salt loses its water of crystallization to become anhydrous. This phenomenon is referred to as

16.55g of lead(II) trioxonitrate(V) was dissolved in 100g of distled water at 20 °C. Calculate the solubility of the solute in moldm-³.

The dispersion of a liquid in a medium will give

The volume of 0.25moldm^-3 solution of KOH that would yield 6.5g of solid KOH on evaporation is [K = 39.0; O = 16.0; H = 1.0]

The percentage by mass of Calcium in Ca(OCl)₂ is [Ca = 40.0; Cl = 35.5; O = 16.0]

The gas law which describes the relationship between volume and temperature is

A saturated solution of silver trioxocarbonate (IV), was found to have concentration of 1.30 x 10^-5 moldm^-3. The soludility product of the trioxocarbonate (IV) is

A zinc half-cell is connected to an iron half-cell through a salt bridge and both are also connected through a copper wire. At which electrode is reduction taking place and which electrode is positively charged?