Which of the following is a chemical test for the gas hydrogen? [id-01]
pops with lit splint
turns limewater cloudy
relights a glowing splint
bleaches damp litmus paper white
Which of the following is a chemical test for the gas carbon dioxide? [id-02]
pops with a lit splint
turns limewater cloudy/milky (white precipitate)
relights a glowing splint
bleaches damp litmus paper white
Which of the following is a chemical test for the gas oxygen? [id-03]
pops with a lit splint
turns limewater cloudy
relights a glowing splint
bleaches damp litmus paper white
Which of the following is a chemical test for the gas chlorine? [id-04]
pops with a lit splint
turns limewater cloudy
relights a glowing splint
bleaches damp litmus paper white
Which gas is formed when a metal reacts with an acid? [id-05]
hydrogen, H2
carbon dioxide, CO2
oxygen, O2
chlorine, Cl2
Which gas is formed when an acid reacts with a carbonate? [id-06]
hydrogen, H2
carbon dioxide, CO2
oxygen, O2
chlorine, Cl2
A gas turns damp red litmus paper blue. The gas is? [id-07]
carbon dioxide, CO2
oxygen, O2
ammonia, NH3
sulfur dioxide, SO2
A gas turns damp orange potassium dichromate(VI) paper green. The gas is? [id-08]
carbon dioxide, CO2
oxygen, O2
ammonia, NH3
sulfur dioxide, SO2
A brown solution of a substance turns dark blue when a drop of starch solution was added. The substance is most likely to be? [id-09]
iodine, I2
chlorine, Cl2
bromine, Br2
sulphur dioxide, SO2
Which of the following descriptions describes a simple chemical test for chloride ions in a solution? [id-10]
A few drops of dilute hydrochloric acid are added to the solution followed by a few drops of barium chloride or barium nitrate solution.
A few drops of dilute nitric acid are added to the solution followed by a few drops of silver nitrate solution.
A few cm3 of dilute hydrochloric acid is added and any gas formed is tested with limewater.
A few cm3 of dilute sodium hydroxide is added and any gas formed is tested with red litmus.
A few cm3 of dilute nitric acid followed by a few drops of silver nitrate solution is added to a solution of a salt. If a white precipitate forms, which ion from the salt is most likely to be in the solution? (Extra advanced level observation: The white precipitate dissolves in ammonia solution.) [id-11]
sulfate ion, SO42-
chloride ion, Cl-
bromide ion, Br-
iodide ion, I-
A few cm3 of dilute nitric acid followed by a few drops of silver nitrate solution is added to a solution of a salt. If a cream precipitate forms, which ion from the salt is most likely to be in the solution? (Extra advanced level observation: The cream precipitate slightly dissolves in conc. ammonia solution.) [id-12]
sulfate ion, SO42-
chloride ion, Cl-
bromide ion, Br-
iodide ion, I-
A few cm3 of dilute nitric acid followed by a few drops of silver nitrate solution is added to a solution of a salt. If a pale yellow precipitate forms, which ion from the salt is most likely to be in the solution? (Extra advanced level observation: The pale yellow precipitate is insoluble with conc. ammonia solution.) [id-13]
sulfate ion, SO42-
chloride ion, Cl-
bromide ion, Br-
iodide ion, I-
Which of the following descriptions describes a simple chemical test for sulphate ions in a solution? [id-14]
A few drops of dilute hydrochloric acid are added to the solution followed by a few drops of barium chloride or barium nitrate solution.
A few drops of dilute nitric acid are added to the solution followed by a few drops of silver nitrate solution.
A few cm3 of dilute hydrochloric acid is added and any gas formed is tested with limewater.
A few cm3 of dilute sodium hydroxide is added, the mixture gently warmed and any gas formed is tested with red litmus.
Which of the following descriptions describes a simple chemical test for carbonate ions in a solution? [id-15]
A few drops of dilute hydrochloric acid are added to the solution followed by a few drops of barium chloride or barium nitrate solution.
A few drops of dilute nitric acid are added to the solution followed by a few drops of silver nitrate solution.
A few cm3 of dilute hydrochloric acid is added and any gas formed is tested with limewater.
A few cm3 of dilute sodium hydroxide is added, the mixture gently warmed and any gas formed is tested with red litmus.
Which of the following descriptions describes a simple chemical test for ammonium ions in a solution? [id-16]
A few drops of dilute hydrochloric acid are added to the solution followed by a few drops of barium chloride or barium nitrate solution.
A few drops of dilute nitric acid are added to the solution followed by a few drops of silver nitrate solution.
A few cm3 of dilute hydrochloric acid is added and any gas formed is tested with limewater.
A few cm3 of dilute sodium hydroxide is added, the mixture gently warmed and any gas formed is tested with red litmus.
A few drops of sodium hydroxide solution was added to a metal salt solution. A dark green gelatinous precipitate was formed. Which metal ion (cation) was present in the salt solution? [id-17]
iron(II) ion, Fe2+
iron(III) ion, Fe3+
copper(II) ion, Cu2+
zinc ion, Zn2+
A few drops of sodium hydroxide solution was added to a metal salt solution. A brown gelatinous precipitate was formed. Which metal ion (cation) was present in the salt solution? [id-18]
iron(II) ion, Fe2+
iron(III) ion, Fe3+
copper(II) ion, Cu2+
zinc ion, Zn2+
A few drops of sodium hydroxide solution was added to a metal salt solution. A blue gelatinous precipitate was formed. Which metal ion (cation) was present in the salt solution? [id-19]
iron(II) ion, Fe2+
iron(III) ion, Fe3+
copper(II) ion, Cu2+
zinc ion, Zn2+
A few drops of sodium hydroxide solution was added to a metal salt solution. A white gelatinous precipitate was formed. Which metal ion (cation) was present in the salt solution? (Advanced level note: The white precipitate dissolves in excess dil. sodium hydroxide to give a clear colourless solution) [id-20]
iron(II) ion, Fe2+
iron(III) ion, Fe3+
copper(II) ion, Cu2+
zinc ion, Zn2+
A sample of a salt was dissolved in hydrochloric acid. A platinum wire was dipped into the solution and then placed in a roaring bunsen flame. A bright yellow flame colour was produced. From this 'flame test' observation, what was the identity of the metal ion in the salt? [id-21]
sodium ion, Na+
copper(II) ion, Cu2+
potassium ion, K+
calcium ion, Ca2+
A sample of a salt was dissolved in hydrochloric acid. A platinum wire was dipped into the solution and then placed in a roaring bunsen flame. A blue flame colour was produced. From this 'flame test' observation, what was the identity of the metal ion in the salt? [id-22]
sodium ion, Na+
copper(II) ion, Cu2+
potassium ion, K+
calcium ion, Ca2+
A sample of a salt was dissolved in hydrochloric acid. A platinum wire was dipped into the solution and then placed in a roaring bunsen flame. A lilac/violet flame colour was produced. From this 'flame test' observation, what was the identity of the metal ion in the salt? [id-23]
sodium ion, Na+
copper(II) ion, Cu2+
potassium ion, K+
calcium ion, Ca2+
A sample of a salt was dissolved in hydrochloric acid. A platinum wire was dipped into the solution and then placed in a roaring bunsen flame. A brick red flame colour was produced. From this 'flame test' observation, what was the identity of the metal ion in the salt? [id-24]
sodium ion, Na+
copper(II) ion, Cu2+
potassium ion, K+
calcium ion, Ca2+
A white solid X dissolved in dilute hydrochloric. A colourless gas evolved which turned limewater milky. When a drop of the solution, on the end of a platinum wire, a bright yellow flame colour was observed when the platinum wire was placed in a roaring bunsen flame. From these observations deduce the identity of substance X. [id-25]
sodium carbonate, Na2CO3
potassium sulfite, K2SO3
calcium carbonate, CaCO3
sodium sulfate, Na2SO4
A blue solid X was dissolved in water and the solution divided into two portions. When a few drops of sodium hydroxide was added to the 1st portion, a blue gelatinous precipitate formed. When a few drops of dilute nitric acid, followed by a few drops of barium nitrate solution was added to the 2nd portion, a white precipitate formed. From these observations deduce the identity of substance X. [id-26]
calcium sulphate, CaSO4
copper(II) sulphate, CuSO4
potassium chloride, KCl
copper(II) chloride, CuCl2
Colourless crystals of substance X were dissolved in water and a few drops of dil. nitric acid, followed by a few drops of silver nitrate solution were added, and a white precipitate formed. A few crystals of X were mixed with a few drops of conc. hydrochloric acid. When a platinum wire was dipped in this mixture, and then placed in a roaring bunsen flame, a red flame colour was seen. From these observations deduce the identity of substance X. [id-27]
potassium sulphate, K2SO4
copper(II) chloride, CuCl2
calcium chloride, CaCl2
sodium sulfate, Na2SO4
Colourless crystals of substance X were dissolved in water and a few drops of dil. nitric acid, followed by a few drops of silver nitrate solution were added, and a yellow precipitate formed. A few crystals of X were mixed with a few drops of conc. hydrochloric acid. When a platinum wire was dipped in this mixture, and then placed in a roaring bunsen flame, a purple-lilac flame colour was seen. From these observations deduce the identity of substance X. [id-28]
lead(II) iodide, PbI2
potassium sulphate, K2SO4
copper(II) chloride, CuCl2
potassium iodide, KI
To a colourless solution X, a few drops of dil. nitric acid, followed by a few drops of silver nitrate solution were added, and a white precipitate formed. When a few drops of litmus solution were added to solution X, the solution turned red. There was no characteristic flame colour when a drop of X on the end of a platinum wire, was placed in a roaring bunsen flame. From these observations deduce the identity of solution X. [id-29]
hydrochloric acid, HCl
sulphuric acid, H2SO4
sodium hydroxide, NaOH
calcium hydroxide, Ca(OH)2
To a colourless solution X, a few drops of dil. hydrochloric acid were added, followed by a few drops of barium chloride, and a white precipitate formed. When a few drops of litmus solution were added to solution X, the solution turned red. There was no characteristic flame colour when a drop of X on the end of a platinum wire, was placed in a roaring bunsen flame. From these observations deduce the identity of solution X. [id-30]
hydrochloric acid, HCl
sulphuric acid, H2SO4
sodium hydroxide, NaOH
calcium hydroxide, Ca(OH)2
A colourless solution gave bright yellow flame colour when tested on the end of a platinum wire placed in a roaring bunsen flame. When a few drops of litmus solution were added to solution X, the solution turned blue. From these observations deduce the identity of solution X. [id-31]
hydrochloric acid, HCl
sulphuric acid, H2SO4
sodium hydroxide, NaOH
calcium hydroxide, Ca(OH)2
A colourless solution gave a brick red colour flame when tested on the end of a platinum wire placed in a roaring bunsen flame. When a few drops of litmus solution were added to solution X, the solution turned blue. From these observations deduce the identity of solution X. [id-32]
hydrochloric acid, HCl
sulphuric acid, H2SO4
sodium hydroxide, NaOH
calcium hydroxide, Ca(OH)2
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Which of the following is a chemical test for the gas hydrogen? [id-01]
Which gas is formed when a metal reacts with an acid? [id-05]
A brown solution of a substance turns dark blue when a drop of starch solution was added. The substance is most likely to be? [id-09]
A sample of a salt was dissolved in hydrochloric acid. A platinum wire was dipped into the solution and then placed in a roaring bunsen flame. A bright yellow flame colour was produced. From this 'flame test' observation, what was the identity of the metal ion in the salt? [id-21]
A sample of a salt was dissolved in hydrochloric acid. A platinum wire was dipped into the solution and then placed in a roaring bunsen flame. A blue flame colour was produced. From this 'flame test' observation, what was the identity of the metal ion in the salt? [id-22]
A sample of a salt was dissolved in hydrochloric acid. A platinum wire was dipped into the solution and then placed in a roaring bunsen flame. A lilac/violet flame colour was produced. From this 'flame test' observation, what was the identity of the metal ion in the salt? [id-23]
A sample of a salt was dissolved in hydrochloric acid. A platinum wire was dipped into the solution and then placed in a roaring bunsen flame. A brick red flame colour was produced. From this 'flame test' observation, what was the identity of the metal ion in the salt? [id-24]
A white solid X dissolved in dilute hydrochloric. A colourless gas evolved which turned limewater milky. When a drop of the solution, on the end of a platinum wire, a bright yellow flame colour was observed when the platinum wire was placed in a roaring bunsen flame. From these observations deduce the identity of substance X. [id-25]