What do you understand by : (a) Ammonal (b) Bentonite ( c) Rubies and Sapphire (d) Laps lazuli ( e) Emery paper.

What do you understand by : (a) Ammonal (b) Bentonite ( c) Rubies a

1.	What do you understand by : (a) Ammonal (b) Bentonite ( c) Rubies and Sapphire (d) Laps lazuli ( e) Emery paper.
Answer» Solution :(a) AMMONAL : It is a MIXTURE of aluminium and ammonium nitrate and is used in bombs. (b) Bentonite : It is alumina-silca clay and is DROPPED frm aeroplanes in the SLURRY form over an area designted for fire suppression, i.e it is used as fire retardant. ( c) Rubies and sapphire aluminium silicate and is used as semiprecious stone. (d) Lapis lazuli : It is sodium aluminium silicate and is used as semiprecious stone. ( e) Emery paper : Impure from of CORUNDUM `(Al_(2)O_(3))` containing impurity of `Fe_(2) O_(3)` silica is called emery and is used in the manufacture of emery parper or sandpaper. This paper is used is used to polish metal.