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Question

Give two differences between the covalent compounds – methane (non-polar) and HCl (polar)

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Answer

Methane (non-polar)
covalent compound		 HCl (polar)
covalent compound
Covalent compounds are said to be non-polar when shared pair of electrons are equally distributed between the two atoms. Covalent compounds are said to be polar when shared pair of electrons are unequally distributed between the two atoms.
The covalent molecule is symmetrical and electrically neutral. The atom which attracts electrons more strongly develops a slight negative charge while the other develops a slight positive charge.

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Chemical Bonding

Fill in the blanks with the correct word from the brackets:
(i) The bond between two elements in group 17[VIIA] of the periodic table is likely to be ____ [ionic/covalent].
(ii) In the reaction of Cl2 + 2KI ⟶ 2KCl + I2 the conversion of 2I to I2 is deemed as ____ [oxidation/reduction].
(iii) The covalent molecule containing three single covalent bonds is ____ [water/methane/ammonia].
(iv) The molecule of water combines with a ____ [hydrogen atom/proton/hydrogen molecule] to form a hydronium ion.
(v) For formation of an electrovalent bond between elements ‘X’ and ‘Y’ which are a metal and non-metal respectively, X should have a ____ [high/low] ionization potential and ‘Y’ a ____ [high/low] electron affinity.

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