What do you understand by the following terms?

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(a) Oxidation – The reaction in which oxygen is gained or hydrogen is lost, is called oxidation reaction. e.g. 2Cu+O2heat 2CuO
(b) Oxidising agent – The substance which give oxygen or substance which removes hydrogen
(c) Reduction – reduction is a process in which a substance removes oxygen or adds hydrogen. Examples: When copper oxide is heated with hydrogen, copper metal is formed along with the formation of water. In this reduction reaction, copper oxide loses oxygen atom to form copper.
(d) Reducing agent — a reducing agent (also known as a reductant, reducer, or electron donor) is a chemical species that “donates” an electron to an electron recipient

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Match the following:

Compound	Formula
1. Boric acid	i. $NaOH$
2. Phosphoric acid	ii. $SiO_2$
3. Nitrous acid	iii. $Na_2CO_3$
4. Nitric acid	iv. $KOH$
5. Sulphurous acid	v. $CaCO_3$
6. Sulphuric acid	vi. $NaHCO_3$
7. Hydrochloric acid	vii. $H_2S$
8. Silica (sand)	viii. $H_2O$
9. Caustic soda (sodium hydroxide)	ix. $PH_3$
10. Caustic potash (potassium hydroxide)	x. $CH_4$
11. Washing soda (sodium carbonate)	xi. $NH_3$
12. Baking soda (sodium bicarbonate)	xii. $HCl$
13. Lime stone (calcium carbonate)	xiii. $H_2SO_3$
14. Water	xiv. $HNO_3$
15. Hydrogen sulphide	xv. $HNO_2$
16. Ammonia	xvi. $H_3BO_3$
17. Phosphine	xvii. $H_3PO_4$
18. Methane	xviii. $H_2SO_4$