NECO SSCE - Chemistry - 2008

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

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

Which of the following compounds is unsaturated?

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

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

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

The most efficient absorber of ultraviolet radiation in the atmosphere is

Which of these is NOT a physical property f water?

The following acids are monobasic EXCEPT

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

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

A substance is said to be hygroscopic when it

The following gases are diatomic EXCEPT

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 these groups will all the substances be insoluble in water?

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

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

Bauxite is the ore of

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

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

The action of zinc on an acid produces

The type of reaction ethyne mainly undergoes is

Chlorine atom forms Cl- by

The molecular formula of ethylbutanoate is?

A chemical system is at equilibrium when

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

The planet with the highest number of moon is

The gas in air used by plants for photosynthesis is

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

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

pH is define as

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

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

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

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

Brownian motion explains

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

Pipe-borne water is usually chlorinated in order to

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

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