WorksheetsKSSM CHEMISTRY FORM 4 (HALOGEN)
Total questions: 10
Worksheet time: 10mins
When descending Group 17 from fluorine to astatine,
I. the atomic size decreases
II. the melting and boiling points decrease
III. the density of the halogens increases
IV. their physical state changes from gas to liquid to solid
I and II
I and III
II and IV
III and IV
When bromine is added to sodium hydroxide and shaken, which of the following products is not formed?
sodium bromide
hypobromic acid
water
sodium hypobromite
Which of the following is a property of bromine?
Exists as reddish-brown gas at room conditions
Less electronegative than chlorine
Turns moist red litmus paper blue
Dissolves in water to form an alkaline solution
Element G, L and J are located in Group 17 of the Periodic Table. Element J is more electronegative than element G. The reaction of red-hot iron wool with gas L is more vigorous than the reaction of red-hot iron wool with gas J. The reactivity of the three elements in ascending order is
G, J, L
L, J, G
L, G, J
J, G, L
Chlorine is placed in Group 17 of the Periodic Table. Which of the following statements is not true about chlorine?
Chlorine reacts with another element from Group 1 of the Periodic Table to form a salt
Chlorine can bleach moist blue litmus paper
Chlorine is more electronegative than fluorine
Chlorine water is acidic
Element W has a proton number of 17. An ion of element R has an electron arrangement of 2.8.18.8 and a formula of R- . It can be predicted that
element W is less reactive than element R
melting point of element W is higher than that of element R
element W is denser than element R
both the aqueous solutions of W and R can conduct electricity
Element Y is located below bromine in the Periodic Table. Which statements below is correct about Y?
I. Forms acidic oxide
II. Exists as monoatomic
III. Have seven valence electrons
IV. Dissolves in water to produce solution which bleach
colour of litmus paper
I and III
II and IV
I, II and III
I, III and IV
What is the meaning of electronegativity?
The ability of an ion to lose electron
The ability of an ion to gain electron
The ability of an atom to lose electron
The ability of atom to gain electron
Which characteristic is similar for fluorine, bromine and iodine?
Formed coloured ions
Exists as gas at room temperature
Have high melting and boiling points
Dissolve in water to form acidic solution
Astatine would form 2 acids, HAt and HOAt, when added to water. Why is the reaction very slow compared to other halogens?
Its valence shell is the furthest away from the nucleus
It has one valence electron in its outermost shell
Its atomic radius is smaller than the others
Its melting point is higher than the others
