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WorksheetsSTPM Chemistry (Group 17)
Total questions: 15
Worksheet time: 13mins
Which of the following are halogens?
Potassium
Astatine
Chlorine
Fluoride ion
Which of the following are correct about halogens given at room conditions?
Chorine - greenish yellow gas
Iodine - grey solid
Bromine - brown gas
Fluorine - purple gas
Which of the following are produced when chlorine is allowed to react with dilute aqueous potassium hydroxide?
H2O(l)
NaOCl(aq)
NaClO3(aq)
KOCl(aq)
Which of the following is the chemical equation for the reaction between chlorine gas and hot aqueous sodium hydroxide?
Cl2(g) + 2NaOH(aq) ----> NaCl(aq) + NaOCl(aq) + H2O(l)
Cl2(aq) + 2NaOH(aq) ----> NaCl(aq) + NaOCl(aq) + H2O(l)
3Cl2(g) + 6NaOH(aq) ----> 5NaCl(aq) + NaClO3(aq) + 3H2O(l)
3Cl2(aq) + 6NaOH(aq) ----> 5NaCl(aq) + NaClO3(aq) + 3H2O(l)
Which of the following are correct about the uses of halogens and their compounds?
Iodine tincture - antiseptic
2,4,6-trichlorophenol - disinfectant
Silver bromide - black-and-white photography
Dichlorodifluromethane - aerosol propellant
Sodium hypochlorite - household bleach
When aqueous silver nitrate is added into a halide solution, a coloured precipitate if formed immediately. This precipitate is insoluble in dilute aqueous ammonia but soluble in both concentrated or excess aqueous ammonia. Name the halide ion present in the halide solution.
(a)
Boiling point of halogens increase from chlorine to iodine descending Group 17. Which property influences the variation of boiling point of the halogens?
Physical state
Bond enthalpy
van der Waals forces
Electronegativity
Which substance is not a redox product of the reaction between potassium iodide and concentrated sulphuric acid?
H2S
I2
SO2
HI
The reactivity of halogen on hydrogen decreases down the Group 17 in the Periodic Table. Which factor explains this observation?
The oxidising power decreases
The bond energy increases
The melting point increases
The electron affinity decreases
When sodium salt, NaX is warmed with concentrated H2SO4, white fumes evolves. What could be observed if a few drops of aqueous AgNO3 are added to aqueous solution of NaX?
A yellow precipitate is formed.
A creamy precipitate is formed.
A white precipitate is formed.
A colourless solution is formed.
The elements in Group 17 (chlorine to iodine) of the Periodic Table are the most reactive non–metals in each of their Period. Which property of the elements that increases on descending the group?
Bond energy
Electron affinity
Ionisation energy
Enthalpy of vaporisation
A coloured vapour which condenses to liquid is obtained when compound Q is heated with concentrated sulphuric acid. Q is
potassium iodide
potassium bromide
potassium chloride
potassium ethanedioate
Which of the following compounds show that chlorine has an oxidation number of +3 ?
Cl2O7
ClO2
NaClO2
NaClO3
Which of the following is not true about halogens?
Halogens exist as diatomic molecule.
The boiling point of halogens increase when going down Group 17.
Halogens have strong covalent bond between molecules.
Colour intensity of halogens increase when going down Group 17.
Write the chemical formula of hydrogen halide that has the highest boiling point.
(a)
