are all ionic compounds polar and all non ionic compounds non polar compounds?/

All ionic compounds are polar. This is because ionic compounds consist of ions of opposite charges held together by electrostatic forces of attraction. Thus in ionic compounds, the positive and negative charges are present separately, because of which all ionic compounds will be polar. However, the non-ionic compounds that is polar compounds may or may not be polar. 

Covalent compounds are basically of two types - polar covalent compounds and non-polar covalent compounds. Non-polar covalent compounds are formed between atoms which have same or nearly same electronegativity values. In such compounds, the bonding electrons are shared equally between the two bonding atoms. Examples include hydrogen (H2), methane (CH4) etc. Non-polar covalent compound are formed between atoms which have large electronegativity difference between them. The more electronegative atom pulls the shared pair of electrons towards itself and hence acquires a partial negative charge. The less electronegative charge develops a partial positive charge. So there is separation of charges in the molecule. Examples of such molecules are HCl, NH3, HF, H2O etc. 

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