One (or more) of the following is TRUE for biomass pyrolysis process:Select one or more:a.It is thermochemical decomposition of biomass in the absence of reaction agentsb.It is an exothermic reactionc.The product from flash pyrolysis at high temperature is gasd.The production of bio-oil can be increased by elevating temperature up to 800°C

The correct answers are:

a. It is thermochemical decomposition of biomass in the absence of reaction agents: This is true. Pyrolysis is a process that involves the thermal decomposition of biomass in the absence of oxygen (or any other reaction agents).

c. The product from flash pyrolysis at high temperature is gas: This is also true. Flash pyrolysis is a rapid pyrolysis process that results in a higher yield of gas products.

The other options are not correct:

b. It is an exothermic reaction: This is not true. Pyrolysis is an endothermic process, meaning it requires heat to proceed.

d. The production of bio-oil can be increased by elevating temperature up to 800°C: This is not true. While temperature does affect the yield of bio-oil, the optimal temperature for bio-oil production is typically around 500°C. Beyond this, the yield of bio-oil decreases as the formation of gas and char increases.