Discuss some chemical properties of metals

Reaction with air: i. metals are converted into their oxides by the action oxygen present in air ii. some metals are not affected by dry air. Zinc and aluminium are oxidized in moist air by to form their oxidesiii. some metals like magnesium and calcium form oxides when heated in airWater solutions of alkali oxides are basic and turn red litmus blue2. Reaction with hydrogen: active metals like Na, K, Ca, Mg, etc react with hydrogen to form their hydrides when heated at a temperature of 400° C and 200 atmosphere pressure3. Reaction with water: different metals react with water at different temperature liberating hydrogen. Some metals react with water at room temperature and some metals which are less active react with hot water while other metals react only with steami. sodium , calcium react with water at room temperature. Sodium burns in water to give sodium hydroxideii. iron magnesium and zinc are not affected by cold water. They are reacted upon by steam onlyZinc and iron react very mildly with steam whereas copper, silver and nickel do not react with water4. Reaction with acidsi. with hydrochloric acid: metals like sodium, magnesium zinc iron react with hydrochloric acid to form metal chloride and hydrogen gasii. with dilute sulphuric acid: more active metals when treated with dilute sulphuric acid give hydrogeniii. with conc sulphuric acid: concentrated sulphuric acid reacts with less active metals like silver, copper, mercury to give metal sulphate and sulphur dioxideiv. with dilute nitric acid: more active metals like sodium, potassium, calcium, etc. when treated with dilute nitric acid form metal nitrate and nitrous oxide less active metals when treated with dilute form metal nitrate and nitric oxide. Copper
silver and lead behave in this wayv. with conc. Nitric acid: metals whether more active or less active form metal nitrate and nitrogen dioxide when treated with conc. Nitric acid5. Reaction with sulphur: sulphur reacts with metals and convert them into their sulphidesSodium is converted into white sodium sulphide