Q7 of 14 Page 97

With the help of a suitable example, explain how ionic compounds are formed State any three general properties of ionic compounds.

Let us take the example of an ionic compound MgCl2.it consists of cation . Mg in its pure form consists two extra electrons on of the other hand chlorine is sort of one electron to complete its octet. Hence one magnesium and two chlorine come together to transfer electrons between them and form the ionic compound. Formation of all ionic compounds take place in similar fashion.



Three general properties of ionic compounds are as follows:


1) Soluble in polar solvents and insoluble in organic solvents.


2) Good conductor in molten form but non-conductor in solid forms.


3) generally found in crystalline solid forms due to strong force of interaction.


More from this chapter

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5

A metal ‘X’ loses two electrons and a non-metal ‘Y’ gains one electron. Show the electron dot structure of compound formed between them. Is it ionic or covalent? Does it have high melting point or low? Will it conduct electricity in solid state or in aqueous solution and why? Will it be soluble in water?

 6

State reasons for the following observations:

(a) The shining surface of some metals becomes dull when exposed to air for a long time.


(b) Zinc fails to evolve hydrogen gas on reacting with dilute nitric acid.


(c) metal sulphides occur mainly in rocks but metal halides occur mostly in sea and lake waters.

 8

Four metal A, B, C and D are added to the following aqueous solutions one by one. The observations made are tabulated below:


Answer the following questions based on the above observations:


(a) Which is the most active metal and why?


(b) What would be observed if B is added to a solution of copper (II) sulphate and why?


(c) Arrange the metal A, B, C and D in order of increasing reactivity.


(d) The container of which metal can be used to store both zinc sulphate solution and silver nitrate solution?


(e) Which of the above solutions can be easily stored in a container made up of any of these metals?

 9

Sample of five metals ‘A’, ‘B’, ‘C’, ‘D’ and ‘E’ was taken and added to the following solution one by one. The results obtained have been tabulated as follows.


Use the above table to answer the following questions about the given metals.


(a) Which of them is most reactive and why?


(b) What would you observe if ‘B’ is added to CuSO4?


(c) Arrange ‘A’, ‘B’, ‘C’, ‘D’ and ‘E’ in the increasing order of reactivity.


(d) Container of which metal can store zinc sulphate and silver nitrate solution?


(e) Which of the above solution(s) can be stored in a container made of any of these metals and why?