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- A substance that is used for the removal of excess of chlorine after the bleaching of a substance by chlorine is called antichlor.
- Aquaregia is mixture of one part nitric acid and three parts of hydrochloric acid.
- The number of molecules present in one gm mole is called Avogadro’s number. It is equal to 6.023 x 10²³
- Sodium Bicarbonate is also called baking soda.
- Sodium Carbonate (Na2CO310H2O) is commonly called washing soda.
- Sodium Sulphate (Na2SO410H2O) is commonly called Glauber’s salt.
- Impure copper having blisters on its surface is called Blister copper.
- Buffer solution-A solution which prevents the change in pH of some other solution.
- Carbohydrate -Organic compound with a general formula Cx(H20)x. They form important component of food.
- Protein – Nitrogenous compounds which are the important constituent of living beings and plants. They are formed from amino acids.
- A chemical substance that changes the rate of a chemical reaction,without itself undergoing any change is called a catalyst.
- A substance formed by a fixed ratio of two or more elements is called a compound.
- Constituents of a mixture can be separated by physical methods.
- No chemical reaction takes place in a physical change, i.e., no new substance is formed.
- There are 18 groups and 7 periods in the Long form of Periodic Table.
- Atomic number was discovered by Moseley. The number of protons and electrons present in an atom is equal.
- Group number in the Mendeleef’s Periodic Table represents the valency of elements present in that group.
- The elements of I-A Group are called alkali metals (Li, Na, K,Rb, Cs and Fr).
- The elements of I-B Group are called coinage metals (Cu, Ag,Au).
- Mercury is also called quick silver.
- Calcium oxide (CaO) is commonly called quick lime.
- Pb,O, is also called Red lead.
- Chemical composition of rust is Fe2O3xH2O.
- Sodium carbonate is called soda ash or sal soda.
- Nitrous oxide (N20) is called laughing gas.
- Chemical formula of marble is CACO3.
- NH3, CO, and C,F2CI2 are used as refrigerant.
- Sodium silicate (Na2SiO3) is called water glass.
- The alcoholic solution of iodine is called iodine tincture.
- Formic acid is obtained from red ants.
- Rold Gold contains 90% copper and 10% aluminium.
- German silver contains 60% copper, 25% zinc and 15% nickel.
- The mixture of benzene, petrol and ethyl alcohol is called power alcohol.
- Fluorine is the most electronegative element.
- Francium is the most electropositive element.
- Silver is the best conductor of electricity.
- Graphite is a non-metal which is the best electrical conductor.
- Chlorine exhibits highest electron affinity.
- Platinum is also called white gold.
- Astatine (At) is the most rare element on earth.
- Oxygen is the most abundantly found element on earth.
- Nitrogen is most abundantly found in atmosphere.
- Petrol is called liquid gold.
- 24 carat gold is called pure gold.
- Substances which undergo sublimation on heating-iodine, naphthalene, camphor, ammonium chloride and phthalic acid.
- The nucleus of only hydrogen atom does not contain neutron.
- Gold, platinum, mercury and silver are noble metals.
- Lithium is the lightest metal.
- Radon is the heaviest gas.
- Astatine is the heaviest element among solid non-metals.
- Lithium is the strongest reducing agent.
- Atom bomb is based upon nuclear fission.
- Hydrogen bomb is based upon nuclear fusion.
- Solid carbon dioxide is called dry ice.
- Only hydrogen is an element whose all the isotopes are named differently (Protium, deuterium and tritium).
- Thermal decomposition of alkanes is called cracking.
- Alpha (a) particle is equivalent to helium nucleus.
- Beta (B) particle is equivalent to electron.
- Diamond is the hardest element found in nature.
- Polonium (Po) has largest number of isotopes (27).
- Sulphuric acid is called oil of vitriol.
