ICSE CHEMISTRY - PRACTICE PAPER 11

ICSE CHEMISTRY - PRACTICE PAPER 11

Question 1

a)                                                                                                                                            [4+2+4]

Group No. Period No.	1	2	13	14	15	16	17	18
2	A		M			T
3		D		J		W	G	R
4		Q

i)           Identify the most electronegative element in group 2.

ii)         Which one of the above elements is a metalloid?

iii)       Identify the Halogen given in the table.

iv)       State the type of bonding between Q and W.

b) Arrange the following elements as described in brackets

      i) Na, S, Al, Cl (in the decreasing of their Ionization potentials)

      ii) F,Cl, I, Br ((increasing order of their Electron affinity)

c)   i) Give reason why a low current must be passed for a longer time during electroplating.

ii) State any one observation seen during the electrolysis of Copper sulphate using Platinum (inert) electrodes.

iii) Name the impurities settle down below the anode during electrorefining.

iv) Define the term Electroplating.

Question 2                                                                                                                      [3+2+3+2]

a) Name the following.

 i) The negatively charged ion produced when an alkali is dissolved in water.

ii) The salt formed by the partial neutralization of an alkali by an acid.

iii) The characteristic property of a crystalline hydrated salt to lose its water of

crystallization to the atmosphere and turn to an amorphous powder.

b) Identify the metal ions present in the salts A and B.

i)  Salt A gives a pale blue precipitate with Ammonium hydroxide.

ii) Salt B gives chalky white precipitate with Sodium hydroxide solution.

c) Write the balanced equation for the following conversions

            i) PbO à Pb(NO₃)₂ à PbCl₂

            ii) Dil. Suplhuric acid  à  Copper sulpahte (using a metallic oxide)

d) State the nature and the strength of the solutions P and Q.

Solution	pH value
P	7
Q	13.5