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ICSE Class 10 Chemistry Question 5 of 19

Solved 2017 Question Paper ICSE Class 10 Chemistry — Question 2

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2
Question

Question 2(b)

State the type of Bonding in the following molecules:

(i) Water

(ii) Calcium oxide

Answer

(i) Covalent bonding
Reason — The valency of hydrogen element is 1 and that of oxygen is 2. Hydrogen needs one electrons to attain stable duplet structure of nearest noble gas - He [2] and oxygen needs two electrons to attain stable octet structure of nearest noble gas - Ne [2,8]
Each of the two hydrogen atoms shares an electron pair with the oxygen atom such that hydrogen acquires a duplet configuration and oxygen an octet configuration resulting in the formation of two single covalent bonds [H-O-H] in the molecule of water.

State the type of bonding in water molecules. Chemical Bonding, Simplified Chemistry Dalal Solutions ICSE Class 10

(ii) Electrovalent bonding
Reason — The valency of calcium (2,8,8,2) element and that of oxygen (2,6) is 2. Calcium donates two electrons and oxygen takes up those two electrons and electrovalent bond is formed.