Chemical Process
Which of the following is an endothermic reaction?

Absorption of SO₃ in 98% H₂SO₄
Both B and C
Thermal dissociation of iron pyrites
C + H₂O = CO + H₂

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Chemical Process
Linde process of gas liquefaction employs

Adiabatic expansion through a throttle valve (Joule-Thomson expansion)
Exchange of heat with colder stream
Merely compressing the gas beyond its critical pressure
Adiabatic expansion against a piston or in a turbine

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