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ICSE Class 10 Answered

Give reason: 1)Iron displaces copper from a solution of copper salt.The reaction is determined as redox. 2)A non metaliic atom [at.no 9] forms a molecule of the same,containing a single covalent bond. A compound has formula H2Y.Y denotes a non metal. State the electronic configuration of Y
Asked by Sunita | 28 Jan, 2018, 09:17: AM
Expert Answer
1)  Displacement reaction is also redox reaction, as, in this reaction, the less reactive reactant gets reduced and the more reactive reactant gets oxidized.

In the following reaction, Fe displaces Cu from CuSO4.Fe gets oxidized while Cu gets reduced.

Fe(s) + CuSO4(aq) → FeSO4(aq) + Cu(s)

Oxidation state of Fe changes from 0 to +2 and oxidation state of Cu changes from +2 to 0

 

2)   A nonmetallic atom [at.no 9] forms a molecule of the same, containing a single covalent bond.

electronic arrangement for at no. 9 is (2,7) or 1s2 2s2 2p5. In its outermost shell, there are 7 electrons hence this atom needs only one electron to complete its octet.

Hence it will share one electron from another same atom to form a single covalent bond.

3)   The non-metal will be Oxygen and the formula is H2O

and its electronic configuration is 1s2 2s2 2p4

Answered by Ramandeep | 29 Jan, 2018, 10:35: AM

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