Group 17 Elements

Reactivity of halogen decreases going down the group because

• The 8th electron difficult to attract by nucleus

• Atomic size decreases down the group

• Electrons are closer to the nucleus

• Screening effect decreases

Which of the following is a solid at room temperature?

• Fluorine

• Chlorine

• Bromine

• Iodine

Element X dissolves in water to produce a solution that turns the blue litmus paper red and then decolourised. What is element X?

• Sodium

• Bromine

• Sulphur

• Neon

Based on what you have learnt, predict the properties of Astatine. Given that Astatine is an element in Group 17 of the Periodic Table.

• Dark brown colour gas with a rapid reaction with H₂O to give 2 acids

• Black colour solid with a no reaction with H₂O

• Black colour solid with a very slow reaction with H₂O to give 2 acids

• Dark brown colour solid with a no reaction with H₂O

Element of Group 17 show the following properties except for

• The acidity of HX increases down the group

• Thermal stability of HX decreases down the group

• Volatility of halogen increases down the group

• Boiling point of halogen increases down the group

Identify the correct order of acidic strength for H-X.

• HCl>HBr>HI

• HCl>HI>HBr

• HI>HCl>HBr

• HI>HBr>HCl

When solid potassium iodide is heated with concentrated sulphuric acid, a coloured fume, Y is liberated. When aqueous silver nitrate is added to aqueous potassium iodide, a precipitate Z is formed.

Which of the following is correct with regards to the colour of Y and Z?

• Y: Purple, Z: Yellow

• Y: Brown, Z: Yellow

• Y: Brown, Z: Cream

• Y: Yellow, Z: White

Which of the following is incorrect statement about silver halide reaction with ammonia?

• Silver chloride is soluble in concentrated ammonia.

• Silver bromide is soluble in concentrated ammonia.

• Silver iodide is soluble in concentrated ammonia.

• Diamminesilver(I) complex ion is formed

Which of the following has the lower van der waals forces than chlorine?

• fluorine

• bromine

• iodine

• astatine

Which of the following elements cannot oxidise bromine?

• fluorine

• chlorine

• iodine

• oxygen