NECO SSCE - Chemistry - 2008

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

The planet with the highest number of moon is

The gas in air used by plants for photosynthesis is

Pipe-borne water is usually chlorinated in order to

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

A chemical system is at equilibrium when

Chlorine atom forms Cl- by

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

Brownian motion explains

Which of the following compounds is unsaturated?

pH is define as

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

The following gases are diatomic EXCEPT

Which of these is NOT a physical property f water?

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

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

Bauxite is the ore of

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

The following acids are monobasic EXCEPT

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

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

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

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

The molecular formula of ethylbutanoate is?

The type of reaction ethyne mainly undergoes is

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

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

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 substance is said to be hygroscopic when it

The most efficient absorber of ultraviolet radiation in the atmosphere is

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

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

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

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

The action of zinc on an acid produces

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

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

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

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

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