How many moles of sodium trioxocarbonate (IV) are there in a 25 cm³ solution which required 10cm³ of 0.05 mol dm-³ hydrochloric acid solution to neutralize it?
Na2CO3(g) + 2HCl(aq) → 2NaCl(aq) + H2O(l) + CO2(g) A. 1.000 mole B. 0.100 mole C. 0.010 mole` D. 0.111 mole Correct Answer: Option C = 0.100 mole
In the electrolysis of CuSO4(g) using platinum electrodes; the reaction at the anode is?
A. 4H+ + 4e− → 2H2 B. 4OH− + 4e− → 2H2O + O2 C. 2OH− + 2e− → 2OH D. 2OH− + 2OH− → 2H2O + O2 Correct Answer: Option B = 4OH− + 4e− → 2H2O + O2
In which of the following is the oxidation number of sulphur equal to -2?
A. SO3 B. S8 C. H2S D. SO2 Correct Answer: Option C = H2S
The solution that will conduct the highest amount of electricity is?
A. 0.5 mol dm−³ of hydrochloric acid B. 2.0 mol dm−³ of hydrochloric acid C. 0.5 mol dm−³ ethanoic acid D. 2.0 mol dm−³ ethanoic acid Correct Answer: Option A – 0.5 mol dm−³ of hydrochloric acidProducts
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