Match Column A with Column B: 
(a) — 4. Redox: In this reaction, Copper Oxide is being reduced (loses oxygen) and Carbon is being oxidized (gains oxygen).
(b) — 3. Reduction: Gain of electrons is defined as reduction. Aluminum ions gain three electrons to form aluminum atoms.
(c) — 5. Electrolytic dissociation: The separation of ions of a pre-existing ionic compound (molten or aqueous) is called electrolytic dissociation.
(d) — 1. Oxidation: Loss of electrons is defined as oxidation. Oxide ions lose electrons at the anode to form oxygen gas.
(e) — 2. Ionization: The process by which a polar covalent compound (like gaseous HCl) forms ions when dissolved in water.
Which of the following element pairs will form an ionic bond? 
Rita added dilute hydrochloric acid to four metals. She recorded her observations in the table given below. While noting her observations she made some errors. 
नीचे दिए गए चित्र को ध्यान से देखिए और चित्र को आधार बनाकर कोई लेख, घटना अथवा कहानी लिखिए जिसका सीधा व स्पष्ट संबंध चित्र से होना चाहिए। 