The results of two tests on solid X are shown.
What is X?
A copper(II) chloride
B copper(II) iodide
C iron(II) chloride
D iron(II) iodide
A white solid is insoluble in water. When it is added to hydrochloric acid, bubbles of gas are formed. Adding aqueous ammonia to the solution formed gives a white precipitate. Adding excess aqueous ammonia causes the precipitate to re-dissolve.
What is the white solid?
A aluminium nitrate
B ammonium nitrate
C calcium carbonate
D zinc carbonate
An element, X, is a dark grey crystalline solid at room temperature. It has a melting point of 114°C and a density of 4.9 g/ cm3. When heated gently it forms a purple vapour.
Where in the Periodic Table is X found?
A
B
C
D
Which two compounds give a white precipitate when their aqueous solutions are mixed?
A silver nitrate and sodium chloride
B silver nitrate and sodium iodide
C sodium hydroxide and copper(II) sulfate
D sodium hydroxide and iron(II) chloride
Two tests are carried out to identify an aqueous solution of X. test 1 Aqueous sodium hydroxide is added and a blue precipitate is produced. test 2 Dilute nitric acid is added followed by aqueous silver nitrate and a white precipitate is produced.
A copper carbonate
B copper chloride
C iron(III) carbonate
D iron(III) chloride
Which gas relights a glowing splint?
A ammonia
B carbon dioxide
C hydrogen
D oxygen
Which statement about aqueous sodium hydroxide is correct?
A When it is added to a solution containing sulfate ions, a white precipitate is formed.
B When it is added to a solution of copper(II) ions, a blue precipitate is formed which dissolves in excess to give deep blue solution.
C When it is added to a solution of iron(II) ions, a green precipitate is formed which does not dissolve in excess.
D When it is added to ammonium chloride, a gas is produced which turns blue litmus red.
Aqueous sodium hydroxide is added to solid X and the mixture is heated. A green precipitate is formed and an alkaline gas is given off.
Which ions are present in X?
A NH4+ and Fe2+
B NH4+ and Fe3+
C OH and Fe2+
D OH and Fe3+
Compound X is tested and the results are shown in the table.
Which ions are present in compound X?
A ammonium ions and carbonate ions
B ammonium ions and chloride ions
C calcium ions and carbonate ions
D calcium ions and chloride ions
The cations shown are identified by the colour of the precipitates formed when an excess of an aqueous solution of X is added.
B limewater
C silver nitrate
D sodium hydroxide
Which of these pairs of aqueous ions both react with dilute sulfuric acid to give a visible result?
Element X forms an acidic, covalent oxide.
Which row shows how many electrons there could be in the outer shell of an atom of X?
Barium hydroxide is an alkali. It reacts with hydrochloric acid.
How does the pH of the hydrochloric acid change as an excess of aqueous barium hydroxide is added?
A The pH decreases from 14 and becomes constant at 7.
B The pH decreases from 14 to about 1.
C The pH increases from 1 and becomes constant at 7.
D The pH increases from 1 to about 14.
The results of three tests on a solution of compound X are shown.
What is compound X?
A aluminium carbonate
B aluminium chloride
C zinc carbonate
D zinc chloride
A solution contains barium ions and silver ions.
What could the anion be?
A chloride only
B nitrate only
C sulfate only
D chloride or nitrate or sulfate
Some reactions involving sodium are shown. Which reaction does not involve the formation of a base?
D.
When sodium reacts with water, a solution and a gas are produced. The solution is tested with litmus paper and the gas is tested with a splint. What happens to the litmus paper and to the splint?
A Litmus paper goes from blue to red; a glowing splint relights.
B Litmus paper goes from blue to red; a lighted splint "pops".
C Litmus paper goes from red to blue; a glowing splint relights.
D Litmus paper goes from red to blue; a lighted splint "pops".
Aqueous sodium hydroxide is added to a solution of a salt. A blue precipitate is formed which does not dissolve in excess. Aluminium foil is added to the mixture and the mixture is warmed. A gas is produced that turns damp red litmus paper blue.
What is the name of the salt?
A ammonium nitrate
B ammonium sulfate
C copper(II) nitrate
D copper(II) sulfate
An element E is burned in air. A white solid oxide is formed. The oxide is tested with damp red litmus paper. The paper turns blue.
What is element E?
A calcium
B carbon
C iodine
D sulfur
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