NECO SSCE - Chemistry - 2008

Which of the following compounds is unsaturated?

When sodium hydroxide solution is added to a solution of zinc salt, the white precipitate formed re-dissolve in excess sodium hydroxide because

The gas in air used by plants for photosynthesis is

The most efficient absorber of ultraviolet radiation in the atmosphere is

A chemical system is at equilibrium when

In which of the following equations can Le-chartelier’s principle be applied?

Which of these arrangement of elements is in order of increasing ionization energy?

The action of zinc on an acid produces

What is the colour of phenolphthalein indicator in a basic medium?

The type of reaction ethyne mainly undergoes is

Pipe-borne water is usually chlorinated in order to

What is the maximum number of electrons that an f-orbital can accommodate?

Chromatography is used to separate components of mixtures which differ in their rates of

If two metallic ions of the same concentration migrate to a graphite cathode, the one that would be preferentially discharged is that with the

What type of bond holds hydrogen fluoride molecules together when forming larger aggregate?

A measure of the degree of disorderliness in a chemical system is known as the

In which of these groups will all the substances be insoluble in water?

Chlorine atom forms Cl- by

The high boiling point of hydrogen fluoride can be explained in terms of?

Matter is neither created nor destroyed in the course of any chemical reactions is a statement of the law of

\( ^{234}_{90}Th → ^{234}_{91}Pa + X \)
In the nuclear reaction above, X is

If two elements X and Z with electronic configurations 2,8.3 and2,8,6 respectively combine, the compound formed will have the formula

The reaction of hydrochloric acid and calcium trioxocarbonate (IV) produces

A device used in the laboratory for intermittent production of gases without heating is

The electrode potential in volts of 2H+(aq) / H2(q) system is

When dust particles collide randomly in a beam of Sunlight, the phenomenon observed is known as

The rate of a chemical reaction is NOT affected by one of these factors

A substance is said to be hygroscopic when it

Which of the following laws is obeyed If at constant temperature, 200cm of hydrogen at 1.5 × 10m⁵Nm^-2pressure becomes 300cm³ at 1.0 × 10⁵Nm^-2 pressure?

An element Z has a combining power of 3. Which of the following formulae is correct of its compound?

The molecular formula of ethylbutanoate is?

Bauxite is the ore of

During the electrolysis of sodium Chloride solution, hydrogen is discharged at the carbon cathode because

Which of these is NOT a physical property f water?

Which of the following will Increase the rate of reaction of Chips of a metal M as shown in the equation below?

M(s)+2HC1(aq) → MCI₂ (aq) + H₂(g)

The following acids are monobasic EXCEPT

Which of the following is a component of the car exhaust?

pH is define as

The planet with the highest number of moon is

A solution is prepared by dissolving I .96g of H₂SO₄ in 250 cm³ of its solution. What is the concentration in moles per dm³?

The following gases are diatomic EXCEPT

Brownian motion explains