Q25 of 203 Page 151

What are (i) ionic compounds, and

(ii) molecular compounds? Give two examples of each type of compounds.

(i) Ionic compounds- The compounds which are formed by the combination of metals and non-metals are called ionic compounds. For example- NaCl, CaCl2.

(i) Molecular Compounds- These compounds are formed by the combination of two non-metal elements. For ex. HCl and H2SO4.


More from this chapter

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23

Write the cations and anions present, if any, in the following:

(a) CH3COONa (b) NaCl


(c) H2 (d) NH4NO3

 24

Give the formulate of the compounds formed from the following sets of elements:

(a) calcium and fluorine


(b) hydrogen and sulphur


(c) nitrogen and hydrogen


(d) carbon and chlorine


(e) sodium and oxygen


(f) carbon and oxygen

 26

What is an ion? How is an ion formed? Explain with the help of two examples of different ions.

 26

The valencies (or charges) of some of the ions are given below:






























Ion Valency Ion Valency



(Charge) (Charge)



Sodium ion 1+ Bromide ion 1-



Ammonium 1+ Hydroxide 1-



ion ion



Calcium ion 2+ Sulphate 2-



ion



Lead ion 2+ Phosphate 3-



Ion



Using this information, write down the formulate of the following compounds:


(i) Sodium phosphate


(ii) Ammonium sulphate


(iii) Calcium hydroxide


(iv) Lead bromide