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

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Chlorine atom forms Cl- by

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

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A substance is said to be hygroscopic when it

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The action of zinc on an acid produces

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

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Which of the following compounds is unsaturated?

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

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

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The following acids are monobasic EXCEPT

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

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

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The following gases are diatomic EXCEPT

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

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The planet with the highest number of moon is

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A chemical system is at equilibrium when

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The gas in air used by plants for photosynthesis is

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

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

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The type of reaction ethyne mainly undergoes is

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

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Brownian motion explains

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

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Which of these is NOT a physical property f water?

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

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pH is define as

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

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Pipe-borne water is usually chlorinated in order to

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

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Bauxite is the ore of

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The most efficient absorber of ultraviolet radiation in the atmosphere is

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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?

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

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

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

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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)

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

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

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

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

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

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The molecular formula of ethylbutanoate is?

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