The colour of the products will be?
5SO2(g) + 2KMnO4(aq) + 2H2O(l) → K2SO4(aq) + 2MnSO4(aq) + 2H2SO4(aq) A. purple solution B. purple precipitate C. colourless precipitate D. colourless solution Correct Answer: Option D – colourless solution
If the heat of combustion of hydrogen is -285.8kJ; What is the heat of formation of water?
A. +571.6 kJ B. -571.6 kJ C. -285.8 kJ D. +285.8 kJ Correct Answer: Option C = -285.8 kJ
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 = H2SProducts
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