Please enter your email: 1.Which pair of compounds could be used in the preparation of calcium sulfate? A calcium carbonate and sodium sulfat B calcium chloride and ammonium sulfate C calcium hydroxide and barium sulfate D calcium nitrate and lead(II) sulfate 2.Which equation describes the most suitable reaction for making lead sulphate? A. Pb + H2SO4 → PbSO4 + H2 B. PbCO3 + H2SO4 → PbSO4 + CO2 + H2O C. Pb(NO3)2 + H2SO4 → PbSO4 + 2HNO3 D. Pb(OH)2 + H2SO4 → PbSO4 + 2H2O 3.An excess of copper (II) oxide is added to dilute sulfuric acid to make crystals of hydrated copper(II) sulfate.The processes listed may be used to obtain crystals of hydrated copper (II) sulfate. Concentrate the resulting solution Filter Heat the crystals Wash the crystalsWhich processes are needed and in which order? A. 1, 2, 3 and 4 B. 1, 2, 4 and 3 C. 2, 1, 2 and 3 D. 2, 1, 2 and 4 4. Molten lead (II) bromide is electrolysed as shown. Which ions are discharged at each electrode? A B C D 5. The following statements about dilute sulphuric acid are all correct. 1 A white precipitate is formed when aqueous barium chloride is added. 2 The solution turns anhydrous copper (II) sulphate from white to blue. 3 Addition of Universal Indicator shows that the solution has a pH value of less than 7.0. 4 The solution reacts with copper (II) oxide, forming a blue solution. Which two statements confirm the acidic nature of the solution? A. 1 and 2 B. 1 and 3 C. 2 and 4 D. 3 and 4 6.One mole of a sample of hydrated sodium sulphide contains 162 g of water of crystallisation.What is the correct formula of this compound? A. Na2S.3H2O B. Na2S.5H2O C. Na2S.7H2O D. Na2S.9H2O 6.The diagram shows the electrolysis of a concentrated aqueous solution containing both Copper (II) ions and sodium ions Which metal is deposited at the negative electrode and why? A B C D 8.The diagram shows the apparatus used to electrolyse lead (II) bromide using inert electrodes. Why does the lamp light up only when the lead(II) bromide is melted? A. Bromine atoms in the lead(II) bromide are converted to ions when it is melted. B. Electrons flow through the lead(II) bromide when it is melted. C. The ions in lead(II) bromide are free to move only when the solid is melted. D. There are no ions in solid lead(II) bromide. 9.Which two substances conduct electricity? A. brass (an alloy) and hydrogen chloride B. hydrogen chloride and solid potassium iodide C. solid potassium iodide and concentrated hydrochloric acid D. concentrated hydrochloric acid and brass 10.A sample of copper contains a metal impurity which is below copper in the reactivity series.The diagram shows the apparatus used for refining the sample The loss in mass of the anode (positive electrode) is 50 g and the gain in mass of the cathode (negative electrode) is 45 g. What is the percentage purity of this sample of copper? A. 10.0 % B. 11.1 % C. 90.0 % D. 95.0 % 11.In the extraction of iron, carbon monoxide acts as A. a catalyst. B. an inert gas. C. an oxidising agent. D. a reducing agent. 12.Which statement describes a test for carbon dioxide gas? A. It bleaches damp litmus paper. B. It relights a glowing splint. C. It turns cobalt (II) chloride paper pink. D. It turns limewater cloudy. 13.Which statement about diamond and graphite is correct? A. Both diamond and graphite are used as abrasives. B. Diamond and graphite have different arrangements of carbon atoms. C. The carbon atoms in graphite have a different number of neutrons from those in diamond. D. The carbon atoms in both graphite and diamond have four covalent bonds 14.Carbon dioxide is produced when dilute hydrochloric acid reacts with A bauxite. B graphite. C limestone. D rust. 15.What does not happen in the combustion of pure ethane in a plentiful supply of air? A a smoky flame is seen B carbon dioxide is produced C energy is released D water is produced 16.Carbon and chlorine form a chloride.What is the formula of this chloride? A. CCl2 B. CCl4 C. CaCl2 D. CaCl4 17. Which statement about diamond and graphite is correct? A. Both diamond and graphite are used as abrasives. B. Diamond and graphite have different arrangements of carbon atoms. C. The carbon atoms in graphite have a different number of neutrons from those in diamond. D. The carbon atoms in both graphite and diamond have four covalent bonds. 18.Which of the following does not produce carbon dioxide? A. adding hydrochloric acid to carbon B. adding hydrochloric acid to potassium carbonate C. burning coke D. burning petrol 19.Which of the following does not produce carbon dioxide? A. adding hydrochloric acid to carbon B. adding hydrochloric acid to potassium carbonate C. burning coke D. burning petrol 20.A solid substance Z burns in air to form a product that is gaseous at 20 °C.What is Z? A. hydrogen B. carbon monoxide C. carbon D. magnesium Loading … Question 1 of 20
WhatsApp us for instant feedback