Q5 of 56 Page 1

The formula of magnesium oxide is MgO. State the formula of barium nitrate and barium sulphate, if barium belongs to the same group as magnesium.

Since the formula of Magnesium oxide is MgO, therefore the valency of the magnesium and Oxygen can be find out by cross multiplication method:


But as we know, the valency of Oxygen is 2. Therefore, the valency of Mg is 2.


Valency of Barium Ba = valency of Magnesium =2


Formula for Barium Nitrate will be:



Formula is: Ba(NO3)2


Formula for Barium Sulphate can be calculated as follows:



Therefore, formula is BaSO4


Effects of Oxidation Reactions in Everyday Life


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Choose from the following:

20Ca, 3Li, 11Na, 10Ne.


(i) An element having two shells completely filled with electrons.


(ii) Two elements belonging to the same group of the periodic table.










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(a) Which two criteria did Mendeleev use to classify the elements in his periodic table?

(b) Which element of period '3' of the modern periodic table


(i) is the most reactive non-metal?


(ii) is the most reactive metal?


(iii) forms ion with -2 charge?


(iv) forms ion with +2 charge?