Chemistry — 2003

The electronic configuration of an element is 1\(s^2\) 2\(s^2\) 2\(p^6\) 3\(s^2\) 3\(p^3\). Where is the element located in the periodic table?

Group O of elements are unreactive because

An element X with electronic configuration \(1S^22S^22P^63S^2\) combines with another element Y with the configuration \(1S^2S^22P^23S^23P^5\). What is the formula of the compound formed?

Which of the following statements about dative bonding is not correct?

Which of the following quantities is the same for one mole of Br 2(l) and one mole of He (g) ?

Which of the following acids is dibasic?

Bees inject an acidic substance when they sting. Which of the following chemical could be used to treat bee stings?

Which of the following salts can be prepared by reacting the metal with dilute H 2 SO 4 ?

Which of the following solutions will give a precipitate with dilute tetraoxosulphate (V) acid? l. Lead (ll) trioxonitrate (V) solution ll. Barium chloride solution lll. Sodium chloride solution

Substance Q reacts with cold water to form a solution which turns red litmus blue. Substance Q could be

What term is used to describe an oxide whose aqueous solution turns blue litmus red?

The pH of 0.50 mol dm -3 solutions of HCI, H 2 SO 4 and CH 3 COOH were measured. which of the following statements about the values obtained is correct?

Which of the following processes involves neutralization?

Sea shells contain mainly CaCO 3 . Calcium oxide can be prepared from sea shells by

Which of the following statements about an exothermic reaction is correct?

A reducing agent is expected to

Consider the electrochemical cell represented below Zn (s) /Zn 2+ (aq) //Cu 2+ (aq) /Cu (s) . Which of the following equations describes the reaction occurring in the cell?

Five metals represented by the letters V to Z are arranged in order of their reactivity as shown . V>W>X>Y>Z. Which of the metals cannot displace Y from an aqueous solution of its salt?

Five metals represented by the letters V to Z are arranged in order of their reactivity as shown . V>W>X>Y>Z. Which of the metals is most likely extracted by the electrolysis of its fused chloride?

Which of the following statements is/are correct about tin plating? l The electrolyte must be a soluble salt of tin ll. the objective to be plated is made the cathode lll. The anode is made of tin lV. The negative electrode dissolves

Determine the amount of electrons needed to deposit 6.4g of copper during the electrolysis of copper (ll) tetraoxosulphate (IV) solution [Cu = 64]

A given fuel has an octane number of 100. This means that

The equation for the reaction at the anode during the electrolysis of concentrated sodium chloride solution is

Which of the following compounds has the same empirical formula as benzene?

A given fuel has an octane number of 100. This means that

Wine containing 8% to 17% ethanol can be converted to gin containing about 40% ethanol by

Which of the following substances could be responsible for the banana taste of a food flavour?

What is the organic product of the reaction of C2H 5OH with excess acidified K 2Cr 2O7(aq)?

The reaction of vegetable oil with a solution of wood ash is

What process does the following equation represent ? n(C\(_{6}\)H\(_{10}\)O\(_{5}\)) + nH\(_{2}\)O → nC\(_{6}\)H\(_{12}\)O\(_{6}\) ?

When excess ethene is shaken with acidified KMnO 4 solution, the product obtained is

What volume of 0.20 mol dm -3 NaOH solution would yield 5.0 g of NaOH on evaporation to dryness? [NaOH = 40g mol -1 ]

Which of the following compound is used for removing impurities from bauxite?

What is the main impurity in haematite?

When a sample of water was boiled, it lathered more readily with soap. it can be concluded that the sample most likely contained

What are the two gases associated with the formation of acid rain?

Which of the following processes will pollute water?