properties of halogens

Chlorine compounds show oxidation states ranging from –1 to +7. What are the reagent(s) and conditions necessary for the oxidation of elemental chlorine into a compound containing chlorine in the +5 oxidation state?

• AgNO3(aq) followed by NH3(aq) at room temperature

• concentrated H2SO4 at room temperature

• cold dilute NaOH(aq)

• hot concentrated NaOH(aq)

which statement is true about halogens?

• form covalent compounds with other non-metallic elements

• A less reactive halogen will displace a more reactive element form its ionic salt

• Form ionic compound with hydrogen

• form negative ion of charge -2

which one is used in the manufacture of bleaches

• Hydrochloric caid

• sodium hydroxide

• silver iodide

• hydrogen

Which one does NOT represent a possible reaction?

• fluorine + sodium chloride ==> sodium fluoride + chlorine

• chlorine + sodium iodide ==> sodium chloride + iodine

• chlorine + potassium bromide ==> potassium chloride + bromine

• bromine + sodium chloride ==> sodium bromide + chlorine

Which four numbers a, b, c and d are required to balance the equation?

a Cl_2(aq) + b KI_(aq) ==> c KCl_(aq) + d I_2(aq)

• 2 1 1 2

• 1 2 2 1

• 2 1 2 1

• 1 2 1 2

which property of halogens increases from fluorine to iodine

• electronegativity of elements

• oxidizing power of elements

• bond length in the halogen molecule

• First ionization energy

The given table shows the results obtained when the halogens X₂, Y₂ and Z₂ were added to separate aqueous solutions containing X^-, Y^- and Z^-. which set correctly shows the strength (strongest first) of the ions X^-, Y^- and Z^- as reducing agents?

• X^- Y^- , Z^-

• X^-, Z^-, Y^-

• Y^-, Z^-, X^-

• Z^-, X^-, Y^-,

silver nitrate is added to an aqueous solution containing Br^- to give a precipitate X, which is then tested for its solubility in concentrated ammonia. which of the following correctly describes the the colour of X and its solubility in ammonia.

• white insoluble

• cream slightly soluble

• white slightly soluble

• yellow insoluble

An excess of aqueous solution of silver nitrate is added to an aqueous solution containing both potassium chloride and potassium bromide. the precipitate formed is the filtered off and washed with distilled water. The precipitate is then shaken with aqueous ammonia and filtered off again.which ion does the final filtrate contain?

• chloride

• silver

• iodide

• potassium

Which property of halogen decreases down the group?

• Bond energy of the hydrogen halogen bond

• Thermal stability

• Boiling point

• Reducing ability of halides