FUNAAB Chemistry 2021/2022 Past Questions

In an electrolytic cell, electrons enter the system through the

Permanent hardness of water is due to the presence of calcium sulphate which is not softened by boiling. Which of the following chemical is normally used to soften it?

How many moles of alanine C₃H₇NO₂, are there in 159g of alanine?

How many atoms are in one mole of CH₃OH?

How many grams of Ca(OH)₂ are in 1500cm³ of 0.0250M Ca(OH)₂

Which of the following is not true of metals?

Which of the following is not a property of chlorine?

If calcium has atomic number 20 and mass number 40. the constituent of the atom is

The gas equation: $$\frac{P_{1}V_{1}}{T_{1}} = \frac{P_{2}V_{2}}{T_{2}}$$ is made up of Charles law and _______ Law

The bleaching action of chlorine is through the process of

A particle that contains 11 protons, 12 neutrons and 10 electrons is probably a

The element with the electron configuration 1S² 2S² Sp³ is

A difference between chemical and physical change is that in chemical change

Alkalis are used mainly

Which of the following solids will leave a block residue after being heated strongly

Which of the following ions will migrate to the cathode during electrolysis?

Which of the following pH values is likely to be that of a slightly alkaline Solution?

Which of the following minerals contain; fluorine as one of its constituent elements?

The product of the reaction between propanoic acid and ethanol is

Which of the following accounts for the difference in the mode of conduction of electricity by metals and aqueous salt solutions?

In an electrolytic cell the electrode at which the electrons enter the solution is called the ......; The chemical change that occurs at the electrode is call -----

the ionic radii of metals are usually

The energy required to remove the most bound electron in a gaseous atom is

A substance is said to be pure if

Which of the following processes is a physical change?

The energy for the dissociation of molecule AB in kJ in the diagram of energy against the reaction coordinate shown below is:

An electron described by the quantum number, n = 4, L = 3 can be located in what orbital?

An aqueous solution of a crystalline salt reacts with dilute HCl to give a yellow precipitate and a gas that turned dichromate paper green. The crystalline salt may be

The oxidation states of nitrogen in ammonium nitrate are

Which of these reagents can confirm the presence of a triple bond?

A given volume of oxygen diffuses through a porous plug in 8.0 seconds. How long will it take the same volume of Sulphur (iv) oxide to diffuse through the plug under the same conditions? (O = 16, SO₂ = 64)

During the electrolysis of CuSO₄ solution using platinum electrode, 0.16g of copper was deposited on the cathode. Calculate the volume of oxygen gas liberated at s.t.p

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

The pollutant that is associated with genetic mutation is

2SO_2(g) + 6O_2(g) ⟶ 2SO_3(g)
In the reaction above, the effect of a decrease in pressure on the equilibrium position will lead to

The solubiltty of Na₃AsSO₄ in the ethanol? (As = 75, Na = 23, O = 16, H = 1)

The basicity of tetraoxophosphate (vi) acid is

Which of the following substances is not a homogenous mixture?

There is a large temperature interval between the melting point and the boiling of a metal because

How many moles of (H⁺) are there in 1dm³ of 0.5M solution of H₂SO₄

A weak Acid is one which is

A positive brown ring test indicates the presence of

Which of the following molecules is not linear in shape?

A solution that contains as much as solute as it can dissolve at a given temperature is said to be

The correctly balanced equation for FeS₂+O₂→Fe₂O₃+SO₂

3-methylbutan-2-one is an isomer of

Two immiscible liquids with different boiling points can be separated by

A mixture of CaCl₂ and CaCO₃ in water can be separated by

Consider the reaction represented by
xPb(NO₃)₂ ---> 2PbO + yNO₂ + zO₂
What are the values of x, y and z respectively?