As we know that our stomach has a lining mucus cells. The mucus is secreted in the gastric juice by the glands present in the stomach wall of stomach from its own secretions of hydrochloric acid (HCl). HCl will cause ...

(I) KCL (II) HCL (III) CCL4 (IV) NaCL

Metals like iron, aluminium, zinc do not react with hot/cold water. They react with water only when water is in the form of steam. 3Fe + 4H₂O → Fe₃O₄ +4H₂

We must know that – the rays parallel to the principal axis, after refraction by convex lens, will pass through the principal focus. And the incident rays coming from the distant object will be parallel to the principal axis. Hence, ...