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

Class 10 Science Terminal Exams MCQ Solutions Class X Science MCQ Extra Questions Answers Class 10th Science Session 2022-23 10th Science Terminal Exam Based MCQ Extra Questions

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

When the object is placed at “C” of a concave mirror, the distance between a real object and its real image is zero.

Class 10th Science Session 2022-23 Class 10 Science Terminal Exams MCQ Solutions Class X Science MCQ Extra Questions Answers 10th Science Terminal Exam Based MCQ Extra Questions

Class X Science MCQ Extra Questions Answers 10th Science Terminal Exam Based MCQ Extra Questions Class 10th Science Session 2022-23 Class 10 Science Terminal Exams MCQ Solutions

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

(i) 2KClO₃ + Heat → 2KCl + 3O₂ (ii) MgO + H₂O → Mg (OH)₂ (iii) 4Al + 3O₂ → 2Al₂O₃ (iv) Zn + FeSO₄ ...