In halogens, the electronegativity decreases down the group due to increase in atomic radius and decrease in tendency to gain electron.

Fluorine has the highest electronegativity. As a fluorine is the smallest and first element of its group. So, down the group of electro-negativity decreases due to increase atomic size.

Lactic acid (C₃H₆O₃) is formed when we respire anaerobically. Condition is that, when the heart and lungs cannot work fast enough to provide enough oxygen around the body to breakdown the glucose.

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 10 Science Terminal Exams MCQ Solutions Class X Science MCQ Extra Questions Answers 10th Science Terminal Exam Based MCQ Extra Questions Class 10th Science CBSC Sample paper