CBSE Class 10 Answered
0.1 mol of a basic substance(x) requires 25cm3 of 8.0 mol/dm3 hydrochloric acid for complete neutralisatin.x could be
1.Al(OH)3
2.CuO
3.K2O
4.NaOH
options:
a.1 and 2
b.2 and 3
c.1 and 4
d.2 and 4
Asked by Divyaa | 13 Nov, 2016, 02:15: PM
Expert Answer
The correct option is b. 2 and 3
The total moles of H+ ions can be found out as 0.025 dm3 x 0.8 mol/dm3 = 0.2 moles of H+ ions of HCl
0.2 moles of H+ ions can be neutralised by 0.1 mol of CuO or 0.1 mol of K2O as 1 mol of CuO or 1 mol of K2O require 2 mol of HCl for complete neutralisation.
CuO + 2HCl → CuCl2 + H2O
K2O + 2HCl → 2KCl + H2O
While in case of 0.1 mol of NaOH and 0.1mol of Al(OH)3, 0.1 mole and 0.3 moles of HCl is required respectively for complete neutralisation.
Answered by Prachi Sawant | 13 Nov, 2016, 06:11: PM
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