Which of the following is a chemical test for the gas hydrogen? [id-01] Which of the following is a chemical test for the gas carbon dioxide? [id-02] Which of the following is a chemical test for the gas oxygen? [id-03] Which of the following is a chemical test for the gas chlorine? [id-04]
Which gas is formed when a metal reacts with an acid? [id-05] Which gas is formed when an acid reacts with a carbonate? [id-06] A gas turns damp red litmus paper blue. The gas is? [id-07] A gas turns damp orange potassium dichromate(VI) paper green. The gas is? [id-08]
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] Which of the following descriptions describes a simple chemical test for chloride ions in a solution? [id-10] 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] 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] 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] Which of the following descriptions describes a simple chemical test for sulphate ions in a solution? [id-14] Which of the following descriptions describes a simple chemical test for carbonate ions in a solution? [id-15] Which of the following descriptions describes a simple chemical test for ammonium ions in a solution? [id-16] 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] 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] 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] 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 precipiate dissolves in excess dil. sodium hydroxide to give a clear colourless solution) [id-20]
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 platium wire, a bright yellow flame colour was observed when the platinum wirewas placed in a roaring bunsen flame. From these observations deduce the identity of substance X. [id-25] 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] 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. hydrochloriic 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] 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] 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] 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] 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] 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]
