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

All metals combine with oxygen to form metal oxides, that are basic in nature gas is expelled out. and turns red litmus solution blue.

(i) 2Al + 3H₂SO₄ → Al₂(SO₄)₃ + 3H₂ (ii) 2AlCl₃ + 3Ca(OH)₂ → 2Al(OH)₃ + 3CaCl₂ (iii)2KClO₃ → 2KCl + 3O₂ (iv) Mg + H₂O → ...

You must know that – chlorine gas reacts with dry Ca(OH)₂ to form bleaching powder. Ca(OH)₂ + Cl₂ → CaOCl₂ + H₂O

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