ICSE Class 10 Chemistry Question Paper 2006

ICSE Class 10 Chemistry Question Paper 2006. Sample papers and question papers for ICSE and ISC students. These question papers have been collected by the best teachers from ICSE and ISC schools. Students should download and practice these papers to gain better marks in examinations. 

SECTION I 

Question 1

(a) Select from the list given below (A to F), the one substance in each case which matches the descriptions given in parts (ii) to (vi). Copy and complete the given grid with your answers as shown for part (i). 

(i)     (ii)     (iii)     (iv)     (v)      (vi)

A  Ammonia

B  Copper oxide

C  Copper sulphate

D  Hydrogen chloride

E   Hydrogen sulphide

F   Lead bromide 

i. Although this compound is not a metal hydroxide, its aqueous solution is alkaline in nature.

ii. A solution of this compound is used as the electrolyte when copper is purified.

iii. When this compound is electrolysed in the molten state, lead is obtained at the cathode.

iv. This compound can be oxidized to chlorine.

v. This compound smells of rotten eggs

vi. This compound can be reduced to copper when heated with coke. 

(b) Match the following:- 

i.  A substance that turns moist starch iodide paper blue

ii. A compound which releases a reddish brown gas on reaction with concentrated sulphuric acid and copper turnings.

iii. A solution of this compound gives a dirty green precipitate with sodium hydroxide.

iv. A compound which on heating with sodium hydroxide produces a gas which forms dense white fumes with hydrogen chloride.

v. A white solid which gives a yellow residue on heating. 

(c) Name the following:- 

i. A metal which is a liquid at room temperature.

ii. A compound which is added to lower the fusion temperature of the electrolytic bath in the extraction of aluminium.

iii. The process of heating an ore to a high temperature in the presence of air

iv. The compound formed by the reaction between calcium oxide and silica.

v. The middle region of the blast furnace. 

(d) 

1. Determine the empirical formula of a compound containing 47.9% potassium, 5.5% beryllium and 46.6% fluorine by mass. (Atomic weight of Be = 9; F = 19; K = 39) Work to one decimal place.

2. Given that the relative molecular mass of copper oxide is 80, what volume of ammonia (measured at stp) is required to completely reduce 120 g of copper oxide? The equation for the reaction is: 3CuO + 2NH₃ → 3Cu + 3H₂O + N₂ (Volume occupied by 1 mole of gas at s.t.p. is 22.4 litres). 

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