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WorksheetsSTPM Group 17
Total questions: 11
Worksheet time: 6mins
Which of the following is best explained by the relative strength of the intermolecular forces between the hydrogen halide molecules, HZ, (fluoride to iodide) in the liquid state?
The enthalpy of formation
The enthalpy of vaporisation
The enthalpy of combustion
The H-Z bond energy
The solution produced when chlorine is bubbled through dilute sodium hydroxide can be used
As pesticide
as bleaching agent
in sterilising water
to extract bromine
1. An aqueous solution of X has the following properties.
(i) Reacts with aqueous silver nitrate to form a precipitation which dissolves in aqueous ammonia.
(ii) Reacts with aqueous barium hydroxide to form salt and water.
(iii) Decomposes in the presence of sunlight to evolve a gas.
What could X be?
HCl and NH4Cl
HCl and HOCl
HBr and HOCl
HBr and NH4Cl
A coloured vapour which condenses to liquid is obtained when compound Q is heated with concentrated sulphuric acid. Q is
potassium iodide
potassium chloride
potassium bromide
potassium ethanedioate
The reactivity of the halogen Cl2, Br2 and I2 decreases down Group 17 of the Periodic Table. Which property does not influence the trend in the reactivity of the halogens?
Atomic size
Electron affinity
Ionisation energy
Bond energy
An element X has valence electron configuration ns2np5 and a melting point of -7°C. AgX does not dissolve in aqueous ammonia and is used in black and white photography. Element X is most probably
fluorine
chlorine
Bromine
Iodine
Astatine is a radioactive halogen which is below iodine in the Periodic Table. Which statement about astatine is not true?
Hydroastatic acid, Hat, is a strong acid
Astatide ion, At-, reduces concentrated sulphuric acid to hydrogen sulphide.
The standard reduction potential of astatine is more positive than that of iodine.
Astatine reacts reversibly with hydrogen at high temperature in the presence of a catalyst.
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?
Enthalpy of vaporisation
Ionisation energy
Electron affinity
Bond energy
The halogens are important chemicals in our daily lives. Which statement about Cl2, Br2 and I2 is true?
The halogens can act as both oxidising and reducing agents
The strength of the Van der Waals forces increases from Cl2 to I2.
Cl2, Br2 and I2 are formed when their respective halides react with concentrated H2SO4.
Cl2, Br2 and I2 react vigorously with hydrogen gas in the presence of ultraviolet light.
The reaction between chlorine and hot, concentrated sodium hydroxide produces
ClO3-
Cl-
H2O
Which gas(es) is/are obtained by warming sodium bromide salts with concentrated sulphuric acid?
Br2
SO2
HBr
