Remember, a light or objects looks black, when an object absorbs all the seven colours and reflects none. That time it looks like black in colour.

Bile is dark green or a yellowish-brown fluid which is produced by the liver and comes to the small intestine through hepato-pancreatic duct.

Solution of pH can be made, when Sodium hydroxide (NaOH) that dissolves in water to form a solution. Which has pH as greater than 7. Because it is an alkali.

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.

(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