ICSE 2002 : SCIENCE Paper 2 (Chemistry)

SCIENCE
Paper 2 (Chemistry) - 2002
(One hour and a half)

Question 1
(a) Select from the list below the gas that matches the description given in each case and answer the questions that follow:
Ammonia, chlorine, hydrogen chloride, sulphur dioxide.

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1.
(i) Gas A is a reducing agent which contains oxygen.
(1) What is the name of gas A?

2.
(2) What will you observe if gas A is bubbled through acidified potassium dichromate solution?

3.
(ii) Gas B turns moist red litmus paper blue.
(1) What is the name of gas B?

4.
(2) Write the equation for the reaction that takes place when gas B is passed over heated copper oxide.

5.
(iii) When gas C is mixed with gas B, dense white fumes are seen and there is no other product.
(1) What is the name of gas C?

6.
(2) What is the name of the product of the reaction between gas B and gas C?

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