Group 17 elements

The following elements are in Group 17 in Periodic Table, Except

• Fluorine

• Argon

• Chlorine

• Bromine

Chlorine is a Group 17 elements. Which of the following statements regarding chlorine is true?

• It exists as a liquid at room temperature

• It reacts with water to produce hydrogen gas

• It reacts with iron wool to form Iron(II) chloride

• It reacts with potassium to form potassium chloride

An atom X require one electron to form ion X. What can be deduced about X?

• It is a halogen

• It is a noble gas

• It is a Group 15 in the Periodic Table of Elements

• It is in Group 16 in the Periodic Table of Elements

Chlorine gas reacts with water to form a

• brown coloured solution

• yellow coloured solution

• solution of pH 12

• solution that bleaches the colour of litmus paper

Which pairs of elements dissolve in water to produce solution that turns blue litmus paper to red and then decolourised?

• Chlorine and Bromine

• Chlorine and Iodine

• Bromine and Astatine

• Iodine and Astatine

Table above show the boiling points of three elements in Group 17. Which of the following best explain why the boiling point increases down the group?

• Increase in proton number

• Increase in strength of the intermolecular forces

• Increase in number of occupied shells of atom

• Increase in strength of the covalent bond between the atoms

Table above show physical properties of halogens. Fluorine is the first element in halogens. Which of the following is true about flourine?

• Its boiling point is -188 degree celcius

• Its melting point is 212 degree celcius

• Its relative molecular mass is 120

• Its colour is black

L and M are diatomic elements. L is less reactive than M. Which of the following elements are L and M?

• L= Bromine; M= Iodine

• L= Iodine; M= Bromine

• L= Sodium; M= Potassium

• L= Potassium; M= Sodium

Chlorine react with cold sodium hydroxide solution. Which of the chemical equation shows the reaction?

• Cl₂(g)+ NaOH(aq) => NaOCl(aq) +HCl(aq)

• Cl₂(g)+ 2NaOH(aq) => NaOCl(aq) +H₂(g) +O₂(g)

• 2Cl₂(g)+ 4NaOH(aq) => 4NaCl(aq) +2H₂O(l) +O₂(g)

• Cl₂(g)+ 2NaOH(aq) => NaCl(aq) +NaOCl(aq) +H₂O(l)

An element X reacts with cold water to form an alkaline solution whereas the elements Y reacts with water to form an acidic solution which can decolourise the litmus papers. If X and Y reacts with each other, the formula of the compound formed is

• XY

• X₂Y

• XY₂

• X₂Y₃