ICSE CHEMISTRY - PRACTICE PAPER 10

ICSE CHEMISTRY - PRACTICE PAPER 10

Question 1                                                                                                                      [4+2+2+2]

a)      The atomic number of an element Z is 16. Then

i)        State the group to which it belongs.

ii)      Is Z a metal or non metal?

iii)    Write the formula of the compound between Z and Sodium.

iv)    State the number of shells present in it.       

b)      If an element M belongs to group I

i)        State the nature of the compounds of it .(Ionic/covalent)

ii)      Write the formula of its oxide.

c)      Give reasons why:

i)  Ionization potential increases across a period.

ii)   Metallic character decreases a group.

d)     E, G and L are the three elements with atomic numbers 13, 11 and 15 respectively.

           i) Arrange them in the decreasing order of their electronegativity.

           ii) Which one among them is an alkali metal.

Question 2                                                                                                                          [4+3+3]

a)      Answer the following questions pertaining to the electrolysis of fused Lead bromide.

i)        State any one appropriate observation.

ii)      Name the product at cathode.

iii)    Give reason why the crucible made of silica is taken as electrolytic cell.

iv)    Write the balanced electrode reaction at anode.

b)      Name the following.

i)        The anode during the electro-refining of Copper metal

ii)      The reduction electrode.

iii)    The anion which gets discharged most easily.

c)      During the process of electroplating the article to be electroplated is made i) ________  and the metal is made ii) _________ and iii) _________ current should be passed for the effective deposition of the metal on the article.