FUNAAB Chemistry 2019/2020 Past Questions

The ores that can be concentrated by floatation are

In a flame test for calcium, the flame appears

What is the molar mass of a substance if 0.4 mole of the substance has a mass of 25.0g

Which of these properties give a solid it's definite shape?

The gas that can be dried using concentrated tetraoxosulphate (VI) acid is

Which of the following alloys contain iron?

The order in which a mixture of sand, ammonium chloride and sodium chloride can be separated is

A substance that is used as a ripening agent for fruits is

The solubility curve shows the variation of solute concentration with

When 50cm³ of a saturated solution of sugar of molar mass 342g at 40°C was evaporated to dryness, 34.2g of dry solid was obtained. The solubility of sugar at 40°C is

To obtain pure carbon (II) oxide from its mixture with carbon (IV) oxide, the mixture should be

The solution that will conduct the highest amount of electricity is

The volume of 2.5 moles of oxygen at s.t.p is
[Molar volume of a gas at s.t.p = 22.4dm³

Which of the following results in the fall of acid rain?

Which of the following substance is trihydric?

The efficiency of a solid catalyst to increase reaction rates depends on its

The pressure of 100cm³ of oxygen at 35°C is 750mmHg. What will be the volume of the gas if the pressure is reduced to 100mmHg without changing the temperature?

The energy change which accompanies the addition of an electron to a gaseous atom is

Which of the following molecules has a triple bond in its structure?

What is the valence shell electron configuration of the element with the atomic number 17?

The density of a certain gas is 1.98 gdm³ at s.t.p. What is the molucular mass of the gas?

Consider the reaction represented by the following equation:
Na₂CO_3(aq) + 2HCl_(aq) → 2NaCl_(aq) + H₂O_(l) + CO_2(g)
What volume of 0.02 moldm^-3 of Na₂CO_3(aq) would be required to completely neutralize 40cm³ of 0.10 moldm^-3 of HCl?

Which of the following is used to study the arrangement of particles in crystal lattices?

During a titration experiment, 0.05 moles of carbon (IV) oxide is liberated. What is the volume of gas liberated?
[Molar volume of a gas at s.t.p = 22.4 dm³]

Ethanol reacts with concentrated tetraoxosulphate (VI) acid at a temperature above 170°C to form

10.0dm³ of water added to 2.0 mol dm^-3 of 2.5 dm³ solution of HCl. What is the concentration of the final solution in mol dm^-3?

2-methylbutan-2-ol is an example of a

Commercial bleaching can be carried out using

When water boilers are used for a long period of time, the solid substance left behind as scale are

How many lone pair(s) of electrons is present in HF?

Which of the following metals is the strongest reducing agent?

A solution of sodium trioxocarbonate (IV) contains 10.6g in 250cm³ of solution. Calculate the concentration of the solution. [Na₂CO₃ = 106.0]

Which of the following metals exists as liquid at ordinary temperature?

Which of the following are structural isomers?

25cm³ of a mixture of noble gases was obtained from air after the removal of other constituents. What was the original volume of air?

How many moles of limestone will be required to produce 5.6g of CaO? [Ca = 40, C = 12, O = 16].

An element will readily form an electrovalent compound if its electron configuration is

How many molecules are there in 14g of nitrogen gas at S.T.P (N = 14, Avogadro number = 6.02 × 10²³ mol)

In the purification of town water supply, alum is used principally to

The solubility of Na₃AsO₄ in ethanol is? [As = 75, Na = 23, O = 16, H = 1]

In the extraction of iron in the blast furnace, limestone is used to

The Avogadro number of 24g of magnesium is the same as that of

Helium atoms are chemically unreactive because

The volume occupied by 1.58g of a gas at S.T.P is 500cm³. What is the relative molecular mass of the gas? (G.M.V at S.T.P = 22.4dm³

Which one of the following is a hygroscopic compound?

Metallic elements usually have structure

A given mass of gas occupies 2dm³ at 300K. At what temperature will its volume be doubled, keeping the pressure constant?

In the reaction SnO₂ + 2C → Sn + 2CO, the mass of coke containing 80% carbon required to produce 0.302kg of a pure tin oxide is? [Sn 119, O = 16, C = 12]

Can hydrogen be used to reduce the oxide of Na?

The term, atomic orbital refers to