(a)(i) State three methods of preparing salts, giving one example in each case of a salt so prepared.

(ii) What type of salt is each of the following? NaH\(_2\)PO\(_4\); (CH\(_3\)COO)\(_2\)Pb; KAI(SO\(_4\))\(_2\). 12H\(_2\)O.

(b)(i) Write an equation for the reaction between dilute HCI and a solution of AgNO\(_3\).

(ii) Explain why NaNO\(_3\) is preferred to AgNO\(_3\) in the preparation of oxygen by thermal decomposition of trioxonitrate (V) salts.

(iii) When silver wire was dipped into an aqueous solution of CuSO\(_4\), the wire remained intact but when the wire was replaced with zinc rod, the rod decreased in size. Give an explanation for this observation.

(c) When a sample of a crystalline salt X was exposed to air, there was a loss in mass.

(i) What phenomenon was exhibited by X?

(ii) Suggest two substances which X could be.

(iii) On heating 5.00 g of a fresh sample of X to constant mass, 1.80g was lost in the form of water vapour. Calculate the number of molecules of water of crystallization in one molecule of X. [H = 1.00; O = 16.00; Anhydrous form of X = 160 g mol\(^{-1}\)

The chromatography separation of ink is based on the ability of the components to

• A. React with solvent
• B. React with each other
• C. Dissolve in each other in the column
• D. Move at different speeds in the column

The air around a petroleum refinery is most likely to contain?

• A. CO₂, SO₃ and N₂O
• B. CO₂, CO and N₂O
• C. SO₂, CO and NO₂
• D. PH₃ H₂O and CO₂

A sample of orange juice is found to have a PH of 3.80. What is the concentration of the hydroxide ion in the juice?

• A) 1.6 ×10^-4
• B) 6.3 ×10^-11
• C) 6.3×10^-4
• D) 1.6×10^-11

An increase in the pressure exerted on gas at a constant temperature results in

• A) a decrease in the number of effective collisions
• B) a decrease in volume
• C) an increase in the average intermolecular distance
• D) an increase in volume

When carbon IV oxide is bubbled through lime water, the solution becomes milky due formation of

• A)
  Ca(HCO\(_3\))\(_2\)
• B)
  CaCO\(_3\)
• C)
  Ca(NO\(_3\))\(_2\)
• D)
  CaCl\(_2\

Which of the following statements is true about 2-methylpropane and butane

• A) They are members of the same homologous series
• B) They have the same boiling point
• C) They have different number of carbon atoms
• D) They have the same chemical properties

The periodic classification is an arrangement of the elements Options

• A) atomic weights
• B) isotopic weights
• C) molecular weights
• D) atomic numbers

Which of the following metals will be the most suitable for use where lightness and resistance to corrosion are of importance?

• A. Lead
• B. Copper
• C. Iron
• D. Aluminium

Which of the following statements is correct about the periodic table?

• A) elements in the same period have the same number of valence electrons
• B) the valence electrons of the elements in the same period increase progressively 'across the period
• C) elements in the same group have the same number of electron shell
• D) the non-metallic properties of the elements tend to decrease across each period