NECO SSCE - Chemistry - 2009 (Objective)

A salt which loses its mass when exposed to air is

What volume of carbon (IV) oxide in dm ³ is produced at s.t.p. when 2.50g of CaCO₃ reacts with excess acid according to the following equation? CaCO₃(s) + 2HCI(aq) → CaCl₂(aq) + H₂O(1) + CO₂(g)

[CaCO₂ 100; molar volume of a gas at s.t.p. = 22.4dm ³]

Which of these compounds has the greatest ionic character?

The empirical formula of a hydrocarbon containing 0.12 mole of carbon 0.3 mole of hydrogen is

\( ^{235}_{92}U + ^1_0n → ^{145}_{56}Ba + ^{88}_{36}Kr + 3^1_0n + Energy \)

The equation above represent a/an

A colourless gas with characteristics odour which dissolves in water to form an alkaline solution is

Which of the following compounds will undergo thermal dissociation?

If the volume of a gas at 35°C is 60cm³, what would be its volume in cm³ at 273k?

How many atoms of chlorine are required to saturate the double bonds of a compound containing a triene?

The following equations represent redox reactions EXCEPT

Which of the following metals is NOT extracted by electrolysis?

The following are ores of metals EXCEPT

What kind of bond exist between carbon and oxygen in C0₃ ^2-?

What mass of copper in gram would be deposited by a current of 1.00ampere passing for 965 seconds through copper(II) tertraoxosulphate (VI) solution? [Cu 63.5; If = 96500c]

Sulphur has an oxidation number of +4 in

All the following belong to the same family EXCEPT

Brain tumors can be located by using an isotope of

Two elements X and Y with electronic configurations 2,8,2 and 2,8,7 respectively, are likely to combine by _________bonding

The following compounds decolorize acidified potassium tetraoxomanganate (VII) solution EXCEPT

How many zones are present in a luminous Bunsen burner flame?

The percentage composition of a hydrocarbon is 79.2 carbon 20.8 hydrogen. Calculate its empirical formula [H = 1, C = 12]

Which of the following statements is NOT correct of group VII elements? They

Which of the following gases is absorbed from the air dun photosynthesis?

When air is passed through alkaline pyrogallol and then lime water, the gases left are

Which of the following gases will bleach moist litmus paper?

The furring of kettles and boilers are caused by

Which of the following non-metals reacts most readily with metals?

The Ideal Gas Law is expressed mathematically as

C\(_6\)H\(_{12}\)O\(_6\)

What is the molar mass of the compound above?

[ H=1, C=12, O=16 }

The process involved in the decomposition of sugar by an enzyme is called

Which of the following is a solid at room temperature?

Which of the following is NOT a fraction of petroleum?

The rate of a reaction usually increases with increase in the concentration of reactants because the

In the electrolysis of dilute tetraoxosulphate (VI) acid using platinum electrodes, the products obtained at the anode are cathode respectively are

Ptotal = P1 + P2 + P3 +…………. Pn, is an expression of law

X = - log₁₀ H⁺]

What does X stand for in the expression above?

Atomic size decreases

Non-polar molecules are held together by

Compound with the general formula CnH\(_{2n+2}\) belong to the_______ group

Which of the following salt solutions will have a pH greater than 7?

The scientist who discovered the zig-zag movement of gas molecules is

The reaction of an alkanol with alkanioc acid is known as

The green house effect is a climatic condition associated with the presence of excess

The relationship between equilibrium constant and free energy change is represented as

During the extraction of iron in the blast furnance, slag is produced using

Which of the following equations is NOT balanced?

A neon atom is chemically nonreactive because