The 2009 Scholarships Programme is open till 26 May 2009 12 AM IST. The HSBC Scholarships Programme aims to nurture leaders around the world and help build global knowledge with the accompanying expectation that the lifelong careers of the scholarship recipients will be marked by significant contributions to the community in which they live and work.
SCIENCE & TECHNOLOGY (Class-10)
Chapter 1. Chemical Reaction and Equations
SET - 4
1. When hydrogen burns in oxygen, water is formed and
when water is electrolysed, then hydrogen and oxygen are produced. What type of
reaction take place: (1 mark)
(i) in first case (ii) in second case
2. Why do we apply paint on iron articles? (1 mark)
SCIENCE & TECHNOLOGY (Class-10)
Chapter 1. Chemical Reaction and Equations
(i) Zinc1. Write a chemical equation for each of the following reactions (2 marks) metal reacts with aqueous solution of hydrochloric acid to form zinc chloride
solution and hydrogen gas.
(ii) When solid mercury (II) oxide is heated, liquid mercury and oxygen gas are produced.
2. Give two examples from daily life where redox reactions are taking place. (2 marks)