Which of the following is the correct description of the appearance of the halogens at room temperature?
A) Chlorine is a yellow-green gas, bromine is a red-brown liquid, and iodine is a shiny gray solid.
B) Chlorine is a yellow-green gas, bromine is a red-brown liquid, and iodine is a purple solid.
C) Chlorine is a colorless gas, bromine is a brown solid, and iodine is a black liquid.
D) Chlorine is a green liquid, bromine is a red gas, and iodine is a yellow solid.
Identify which of the following mixtures will result in a chemical reaction:
A) Bromine solution and sodium chloride solution
B) Iodine solution and sodium bromide solution
C) Chlorine solution and potassium flouride solution
D) Chlorine solution and sodium iodide solution
The type of reaction occurring between chlorine solution and potassium bromide solution is known as:
A) Neutralisation
B) Decomposition
C) Precipitation
D) Displacement
In the reaction between chlorine and potassium bromide:
A) Chlorine is oxidised and potassium is reduced.
B) Bromine is oxidised and chlorine is reduced.
C) Chlorine is reduced and bromide ions are oxidised.
D) Potassium is oxidised and bromide ions are reduced.
Chlorine is a stronger oxidising agent than bromine because:
A) Chlorine atoms have more electron shells.
B) Chlorine has a greater tendency to gain electrons to complete its outer shell.
C) Bromine molecules are larger and less reactive.
D) Chlorine is a gas at room temperature.
Which of the following observations correctly identifies iodide ions?
A) 1 and 3
B) 1 and 4
C) 2 and 3
D) 2 and 4
A precipitate is formed after adding silver nitrate to a solution. To distinguish between a chloride and a bromide ion, one should:
A) Observe the initial colour of the precipitate.
B) Add dilute ammonia and see if the precipitate dissolves.
C) Add concentrated ammonia and see if the precipitate dissolves.
D) Either B or C would be a valid test.
The volatility of the halogens decreases from Cl₂ to I₂. What is the correct explanation for this trend?
A) The strength of the covalent bond within the halogen molecule increases.
B) The strength of the instantaneous dipole-induced dipole forces increases.
C) The electronegativity of the halogen atoms decreases.
D) The molecules become less polarisable down the group.
The boiling point of hydrogen iodide (HI) is significantly higher than that of hydrogen chloride (HCl). What is the primary reason for this?
A) The H–I bond is stronger than the H–Cl bond.
B) HI molecules are more polar than HCl molecules.
C) The intermolecular forces in HI are stronger than in HCl.
D) Iodine has a larger atomic radius than chlorine.
Among the hydrogen halides, which one has the highest boiling point?
A) HF
B) HCl
C) HBr
D) HI
Which of the following trends in Group 17 does NOT decrease down the group?
A) Electronegativity of halogens
B) Thermal stability of hydrogen halides
C) The vigor of the reaction between halogens and hydrogen
D) The power of halide ions as reducing agents
What are the required conditions for the reaction between hydrogen and chlorine to occur rapidly and completely?
A) High pressure and the presence of a platinum catalyst
B) Heat and a nickel catalyst
C) A spark of light or ultraviolet radiation
D) Cooling and the presence of a iron oxide catalyst