Question

which metal strips burns with white Flame when kept in a candle flame

Answer 1

Magnesium Ribbon is a metal strip that burns with white flame and also produces white paper ashes or powder when kept in a candle flame

Answer 2

The property displayed in this demonstration uses magnesium metal to display what happens to metal when it reacts with oxygen gas, that is found in the air around us. Magnesium metal and its alloys are explosive hazards; they are highly flammable in their pure form when molten or in powder or in ribbon form. Burning or molten magnesium metal reacts violently with water.