20 cm3 of 0.09 mol dm3 solution of tetraoxosuiphate (Vi) acid requires 30cm3 of sodium hydroxide solution for complete neutralization. The molar concentration of sodium hydroxide is [H = 1; S = 32; 0 = 16; Na = 23]
A. 0.03 mol dm3
B. 0.12 mol dm3
C. 0.27 mol dm3
D. 0.45 mol dm3
E. 0.90 mol dm3
The decreasing order of the oxidising power of the halogens is
Which statement BEST describes the process of oxidation?
A. addition of hydrogen
B. loss of oxygen
C. decrease in oxidation number
D. loss of electrons
E. gain of elections.
Animal charcoal differs from wood charcoal in that it
Animal charcoal or bone black is the carbonaceous residue obtained by the dry distillation of bones. It contains only about 10% carbon, the remaining being calcium and magnesium phosphates (80%) and other inorganic material originally present in the bones.