Yes, hydrogen is the lowest ignition point

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No. Hydrogen does not have the lowest ignition temperature.  There are natural gas and many other fuels and materials which ignite at much less temperatures.
like kerosene, petrol for example.
  Hydrogen ignites at 400 or 500 deg C.

The fuel weight, calorific value, oxygen required, ignition temperature, cost, availability, danger safety measures etc. are decision parameters for hydrogen to be chosen for ignition.

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