Q1. Why is photosynthesis considered as anendothermic reaction?
Q2. In electrolysis of water, why is the volume of gas collected over one electrode double that of the
other electrode?
Q3. What happens when water is added to solidcalcium oxide taken in a container? Write achemical formula for the same.
Q4. Give one use of quick lime.
Q5. Give three types of decomposition reaction.
Q6. Name the compound used for testing CO²gas
Answers
Answer:
1 Photosynthesis is considered an endothermic reaction, because during the process of photosynthesis, energy from the sun or sunlight is being absorbed.
2 Water composition is 2atoms of H and 1atom of O . Therefore H is double than O . The two electrodes collect H and O separately . We know that hydrogen composition in water is double than oxygen , so we find volume of gas collected in one electrode is double than volume of gas collected in another electrade .
3 When calcium oxide is added to water it forms calciun hydroxide Called slaked lime. The reaction between water and CaO is an exothermic reaction. Heat is released during exothermic reaction ,rise in temperature is observed.
Quicklime has a wide range of uses, including in the production of iron and steel, paper and pulp production, treatment of water and flue gases and in the mining industry. For the iron and steel industry, we also supply different fractions of both reactive shaft furnace-burnt and hard-burnt rotary kiln lime.
Decomposition reactions can be classified into three types:
Decomposition reactions can be classified into three types:Thermal decomposition reaction.
Decomposition reactions can be classified into three types:Thermal decomposition reaction.Electrolytic decomposition reaction.
Decomposition reactions can be classified into three types:Thermal decomposition reaction.Electrolytic decomposition reaction.Photo decomposition reaction.