Which statement about fuel is correct. a) heat energy can only be produced by burning fuels.
b) hydrogen is used as a fuel although it is difficult to store.
c)methane is a good fuel because its produce only water when burning
d) uranium is burned in air to produce energy

I’m guessing you’re more alert to yourself or your surroundings if you’re more concentrated

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The activity series is shown in the attached picture. if the element is below the other, then you can displace the other. following the activity series as a guide, the reactions are as follows: nickel and aluminum chloride3 ni + 2 alcl₃  → 3 nicl₂ + 2 albarium and copper bromideba + cubr  →  no reaction because cu is less oxidizable than bapotassium nitrate and aluminum3 kno₃ + al  → al(no₃)₃ + 3 ksodium phosphate and zincnaso₄ + zn  → znso₄ + na