Question Library

Which of the following compounds determines the octane rating of petrol?

Which of the following compounds would react with ethanoic acid to give a sweet smelling liquid?

Which of the following separation techniques would show that black ink is a mixture of chemical compounds?

The following substances are examples of addition polymer except

When bromine is added to ethene at room temperature, the compound formed is

The compound that makes palm wine taste sour after exposure to the air for few days is

The reagent that can be used to distinguish ethene from ethyne is

The following substances are ores of metals except

Which of the following processes does not involve the use of limestone?

Aluminium is extracted electrolysis from

The principle of column chromatography is based on the ability of the constituents to

How many isotopes has hydrogen?

Which of the following ions has the electron configuration 2,8,8?

(a)The table below gives the volume/pressure data for a particular sample of a gas-at a given temperature. Volumedm\(^3\) (V) 4.00 2.00 1.00 Pressure/atm (P) 1.00 2.00 4.00 (i) Deduce a mathematical relationship between volume (V) and pressure (P). (ii) Name law that can be deduced from the data. (iii) Calculate the pressure of the gas when the volume is 3.20 dm\(^3\) (b)(i) What is the role of a salt bridge in an electrochemical cell? (ii) What type of ions must flow into the cathode? Give a reason for your answer. (iii)A standard galvanic cell constructed with Ag\(^+_{(aq)}\) Ag\(_{(s)}\) and Zn\(^{2+}_{(aq)}\) couple is discharged until 3.3 g of Ag forms. I. Write the overall cell reaction and standard cell potential? II. How many moles of electrons flowed through the circuit during the discharge? III. How many coulombs of charges flowed through the circuit? Ag\(^+_{(aq)}\) + e\(^-\) \(\rightleftharpoons\) Ag\(_{(s)}\); E^\circ = + 0.80V Zn\(^{2+}_{(aq)}\) + 2\(^-\) \(\rightleftharpoons\) Zn\(_{(s)}\), E^\circ = – 0.76 V [Ag = 108] (c)(i) Define each of the following terms: I. Activation energy; II. Exothermic reaction. (ii) Give one example of an endothermic process. (iii) What is the significance of activated complex in a chemical reaction?

The following table gives the atomic numbers of elements V, W, X, Y and Z. Element V W X Y Z Atomic number 11 16 18 19 24 (a)Which of the elements: (i) belong(s) to group 1? (ii) is/are riotle gas(es)? (iii) form(s) coloured compound(s)? (iv) form(s) an anion? (v) react(s) with water to liberate hydrogen? (vi) react(s) with water to form alkaline solution? (b) What is the: (i) charge on the ion formed in (a)(iv) above? (ii) group of the element(s) in (a)(i) above? (c)(i) Write the formula of the compound formed between element V and element W. (ii) Sate the type of bond formed in (c)(i) above. Explain your answer. (d)(i) What is a covalent compound? (ii) Give two factors that influence covalent bonding. (iii) State the type of bond that exists in each of the following substances: MgO, NH\(_3\) and Fe. (iv) What are intermolecular forces?