In Latin, the meaning of “AQUA – REGIA” is Water which is loyal or in another words Loyal water. Aqua – regia can be prepared by mixture of two chemicals, (used by jewellery) first is concentrated HCl and concentrated HNO₃ ...

When manganese dioxide reacts with hydrochloric acid, the manganese dioxide (MnO₂) reduces to MnCl₂ while hydrochloric acid (HCI) oxidizes to chlorine gas (Cl₂).

(i) Ca(OH)₂ + CO₂ → CaCO₃ + H₂O (ii) Fe + CuSO₄ → FeSO₄ + Cu (iii) KClO₄⁻ → KCl + 2O₂ (iv) Cu + 2HNO₃ → ...

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.