Stainless steel is an alloy of

• A) carbon, iron and copper
• B) carbon, iron and silver
• C) iron, chromium, carbon, nickel, silicon, and manganese
• D) carbon and iron only

(a) Give three differences between electrovalent compounds and covalent compounds

(b) List two physical properties of metals which can be accounted for by their structure

(c) Thorium (Th) metal undergoes a reaction represented by the following equation:

\(^{234}_{90}Th \to X + ^{234}_{91}Pa\)

(i) State the type of process involved in the reaction

(ii) Balance the equation equation and hence identify X.

(iii) Name one equipment which can be used to detect X.

(iv) Sketch a curveto show the mass of given quantity of thorium will change over a long period of time.

(d) Y is a moderately reactive divalent found naturally in the combined state as the trioxocarbonate (IV) salt, YCO\(_3\) is decomposed by strong heat, state the steps you would use in extracting Y from the ore. Write equation to show the chemical processes involved.

Which of the following substance is an alloy of lead?

• A. Brass
• B. Duralumin
• C. Stainless steel
• D. Soft solder

P_Total= F₁ + P₂+ P₃ + .........P_n where P_Total is the pressure of a mixture of gasses. The equation above is an expression of

• A. Graham' law
• B. Gay-Lussac' Law
• C. Boyle' law
• D. Dalton' law

Which of the following metals reacts slowly with cold water?

• A. Iron
• B. Silver
• C. Calcium
• D. Pottassium

Which of the following metals is the strongest reducing agent?

• A. Sodium
• B. Silver
• C. Potassium
• D. Copper

A mixture contains 20cm³ of hydrogen, 35cm³ of oxygen. 15cm³ of carbon dioxide and 10cm³ of nitrogen at S.T.P, which of the following gives the mole fraction of hydrogen in this mixture?

• A) 0.02
• B) 0.16
• C) 0.20
• D) 0.25

The compound is the product of oxidation of

• A) butan-3-ol
• B) butan-1-ol
• C) 3-methylpropan-2-ol
• D) butan-2-ol

Petrol consists mainly of

• A. polymers
• B. alkanoates
• C. hydrocarbons
• D. alktanols

A catalyst increases the rate of chemical reaction by

• A. decreasing the temperature of the reaction
• B. decreasing the activation energy of the reaction
• C. increasing the surface area of the reactants
• D. decreasing the surface area of the products