Chemical Process
Viscosity index improver (like polystrene or polyisobutylene) is added to lubricant to

Increase its viscosity
Increase the variation in its viscosity with temperature
Reduce the variation in its viscosity with temperature
Reduce its viscosity

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Chemical Process
The chamber process is

A batch process for directly producing high strength (98 to 100%) H₂SO₄
None of these
Preferred over contact process for producing 98 to 100% H₂SO₄ and various oleums
Non-catalytic and operates only on pyrites

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