Periodicity - Test 1

This test is on periodicity. You may like to revise this chapter first before attempting the questions. 






The total score for this test is 10 marks. You should complete the test in 10 minutes.

Section A: Multiple Choice Questions (5 marks)

1. The symbol of an atom of element X may be written as 

To which Group does element X belong?

A. 0 
B. II
C. V
D. VII

2. When potassium is added to cold water, the reaction occurs explosively. 

When metal Y is added to cold water, the reaction occurs even more explosively.

Which of the following could Y be?

A.  calcium
B.  sodium
C.  rubidium
D. magnesium

3. The colour intensity of Group VII elements decreases down the Group.

What could be the colour of Astatine?

A. reddish brown
B. black
C. purple
D. white

4. Element W exists as a macromolecule.

To which Group does element W belong?

A. 0
B.  I
C. IV
D. VII

5. Caesium is in Group I of the periodic table.

What is the charge of caesium ion?

A. +1
B. +2
C. +3
D. +4

Section B: Open- ended questions (5 marks)
1. Elements W, X, Y and Z have the following proton numbers.


Element
Proton number
W
8
X
10
Y
12
Z
16


(a) Which elements are in the same group in the periodic table?
(b) Name any two elements that can combine together to form ionic compounds? Write the formula of the compound.
(c) Which element exist as atoms?

2. Chlorine is bubbled into a test tube containing to aqueous sodium bromide. 
(a) Describe the observations.
(b) Write an ionic equation for the reaction.

Answers

Section A
1. C
2. C
3. B
4. C
5. A

Section B
1 (a) W and Z
(b) Y and W / Y and Z; YW/ YZ
(c) X

2 (a) Greenish yellow chlorine dissolves in the solution. Colourless solution turns reddish brown.
(b) Cl2 + 2 Br- ---> Br2 + 2Cl-

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