Sodium and potassium react violently with the release of huge amount of heat. So the reaction is highly exothermic. Hydrogen gas which is produced during the reaction catches fire. Calcium reacts less violently with water. The heat evolved is not ...
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Metals react with water to produce metal oxide and hydrogen gas. Metal oxides that are soluble in water, dissolve in water to form metal hydroxide.
Class 10 Science Terminal Exams MCQ Solutions Class X Science MCQ Extra Questions Answers 10th Science Terminal Exam Based MCQ Extra Questions Class 10th Science Session 2022-23
The depletion of ozone layer is linked to synthetic chemicals such as chlorofluorocarbons (CFCs) which are used as refrigerants, aerosol sprays and in fire extinguishers.
When oxygen reacts with UV rays it breaks down as free oxygen (O) atoms. Again free atoms combine with oxygen and creates O₃. O₂ + UV → O + O O + O₂ → O₃