NECO SSCE - Chemistry - 2008

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

The gas in air used by plants for photosynthesis is

pH is define as

Bauxite is the ore of

Which of the following compounds is unsaturated?

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

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

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

The following gases are diatomic EXCEPT

The molecular formula of ethylbutanoate is?

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

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

The most efficient absorber of ultraviolet radiation in the atmosphere is

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

Chlorine atom forms Cl- by

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

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)

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

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

The action of zinc on an acid produces

Brownian motion explains

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

The planet with the highest number of moon is

A chemical system is at equilibrium when

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?

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

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

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

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

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

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 substance is said to be hygroscopic when it

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

The following acids are monobasic EXCEPT

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

Pipe-borne water is usually chlorinated in order to

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

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

The type of reaction ethyne mainly undergoes is

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

Which of these is NOT a physical property f water?

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