NECO SSCE - Chemistry - 2008

The most efficient absorber of ultraviolet radiation in the atmosphere is

The gas in air used by plants for photosynthesis is

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

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

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

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?

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

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

pH is define as

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)

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

Bauxite is the ore of

The following acids are monobasic EXCEPT

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

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

The type of reaction ethyne mainly undergoes is

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

Brownian motion explains

\( ^{234}_{90}Th → ^{234}_{91}Pa + X \)
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

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

The molecular formula of ethylbutanoate is?

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

Pipe-borne water is usually chlorinated in order to

The planet with the highest number of moon is

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

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

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

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

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

The following gases are diatomic EXCEPT

A substance is said to be hygroscopic when it

Which of these is NOT a physical property f water?

A chemical system is at equilibrium when

Which of the following compounds is unsaturated?

The action of zinc on an acid produces

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

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

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

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

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

Chlorine atom forms Cl- by