NECO SSCE - Chemistry - 2009

The following equations represent redox reactions EXCEPT

Maelezo ya Majibu

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

Maelezo ya Majibu

The furring of kettles and boilers are caused by

Maelezo ya Majibu

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

Maelezo ya Majibu

Which of the following gases will bleach moist litmus paper?

Maelezo ya Majibu

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

Maelezo ya Majibu

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

Maelezo ya Majibu

The reaction of an alkanol with alkanioc acid is known as

Maelezo ya Majibu

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

Maelezo ya Majibu

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

Maelezo ya Majibu

X = - log₁₀ H⁺]

What does X stand for in the expression above?

Maelezo ya Majibu

A neon atom is chemically nonreactive because

Maelezo ya Majibu

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

Maelezo ya Majibu

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

Maelezo ya Majibu

Sulphur has an oxidation number of +4 in

Maelezo ya Majibu

A salt which loses its mass when exposed to air is

Maelezo ya Majibu

Which of these compounds has the greatest ionic character?

Maelezo ya Majibu

Atomic size decreases

Maelezo ya Majibu

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

Maelezo ya Majibu

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]

Maelezo ya Majibu

Which of the following compounds will undergo thermal dissociation?

Maelezo ya Majibu

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]

Maelezo ya Majibu

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

Maelezo ya Majibu

All the following belong to the same family EXCEPT

Maelezo ya Majibu

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

Maelezo ya Majibu

The following are ores of metals EXCEPT

Maelezo ya Majibu

The Ideal Gas Law is expressed mathematically as

Maelezo ya Majibu

Which of the following equations is NOT balanced?

Maelezo ya Majibu

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

Maelezo ya Majibu

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

Maelezo ya Majibu

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

The equation above represent a/an

Maelezo ya Majibu

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

What is the molar mass of the compound above?

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

Maelezo ya Majibu

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

Maelezo ya Majibu

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

Maelezo ya Majibu

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

Maelezo ya Majibu

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

Maelezo ya Majibu

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

Maelezo ya Majibu

Which of the following is a solid at room temperature?

Maelezo ya Majibu

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

Maelezo ya Majibu

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

Maelezo ya Majibu

Non-polar molecules are held together by

Maelezo ya Majibu

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

Maelezo ya Majibu

Which of the following metals is NOT extracted by electrolysis?

Maelezo ya Majibu

Which of the following is NOT a fraction of petroleum?

Maelezo ya Majibu

Brain tumors can be located by using an isotope of

Maelezo ya Majibu

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

Maelezo ya Majibu

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

Maelezo ya Majibu