Match the zones of a candle flame with their corresponding characteristics: (a) Hottest part -> (i) Innermost zone of unburnt wax vapors (b) Moderately hot -> (ii) Middle zone of partial combustion (c) Least hot -> (iii) Outermost zone of complete combustion

Goldsmiths blow the 'A' zone of a flame with a metal blowpipe to melt gold. The colour of this zone is 'B' and it is a zone of 'C' combustion. Here, A, B, and C are respectively:

In which of the following situations can water NOT be used to extinguish the fire? a) Burning of wood b) Burning of diesel c) Burning of paper d) Short-circuit of an electrical appliance