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

Maelezo ya Majibu

Pipe-borne water is usually chlorinated in order to

Maelezo ya Majibu

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

Maelezo ya Majibu

The most efficient absorber of ultraviolet radiation in the atmosphere is

Maelezo ya Majibu

The action of zinc on an acid produces

Maelezo ya Majibu

The planet with the highest number of moon is

Maelezo ya Majibu

Bauxite is the ore of

Maelezo ya Majibu

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

Maelezo ya Majibu

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

Maelezo ya Majibu

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

Maelezo ya Majibu

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

Maelezo ya Majibu

Chlorine atom forms Cl- by

Maelezo ya Majibu

The following gases are diatomic EXCEPT

Maelezo ya Majibu

pH is define as

Maelezo ya Majibu

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

Maelezo ya Majibu

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

Maelezo ya Majibu

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

Maelezo ya Majibu

The gas in air used by plants for photosynthesis is

Maelezo ya Majibu

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

Maelezo ya Majibu

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

Maelezo ya Majibu

A chemical system is at equilibrium when

Maelezo ya Majibu

Brownian motion explains

Maelezo ya Majibu

The following acids are monobasic EXCEPT

Maelezo ya Majibu

Which of the following compounds is unsaturated?

Maelezo ya Majibu

Which of these is NOT a physical property f water?

Maelezo ya Majibu

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

Maelezo ya Majibu

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

Maelezo ya Majibu

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

Maelezo ya Majibu

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)

Maelezo ya Majibu

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

Maelezo ya Majibu

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

Maelezo ya Majibu

The type of reaction ethyne mainly undergoes is

Maelezo ya Majibu

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

Maelezo ya Majibu

The molecular formula of ethylbutanoate is?

Maelezo ya Majibu

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

Maelezo ya Majibu

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

Maelezo ya Majibu

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

Maelezo ya Majibu

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?

Maelezo ya Majibu

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

Maelezo ya Majibu

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

Maelezo ya Majibu

A substance is said to be hygroscopic when it

Maelezo ya Majibu

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

Maelezo ya Majibu