(i) chemical formulae of Magnesium chloride =\( MgCl_2 \)
(ii) chemical formulae of Calcium oxide = \(CaO\)
(iii) chemical formulae of Copper nitrate = \(Cu(NO_3)_2 \)
(iv) chemical formulae of Aluminium Chloride = \(AICI_3\)
(v) chemical formulae of Calcium carbonate = \(CaCO_3 \)
(Street Plan) : A city has two main roads which cross each other at the centre of the city. These two roads are along the North-South direction and East-West direction.
All the other streets of the city run parallel to these roads and are 200 m apart. There are 5 streets in each direction. Using 1cm = 200 m, draw a model of the city on your notebook. Represent the roads/streets by single lines. There are many cross- streets in your model. A particular cross-street is made by two streets, one running in the North - South direction and another in the East - West direction. Each cross street is referred to in the following manner : If the 2nd street running in the North - South direction and 5th in the East - West direction meet at some crossing, then we will call this cross-street (2, 5). Using this convention, find:
(i) how many cross - streets can be referred to as (4, 3).
(ii) how many cross - streets can be referred to as (3, 4).