With the exception of water,which one of the following is possibly the most important accessory chemical substance in industrial processes?

  • A
    Petroleum
  • B
    Rubber
  • C
    Ethanol
  • D
    Liquid nitrogen

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Match the Column-$I$ and Column-$II$ by suitable manner.
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$4$. Streptokinase$(D)$ Blood cholesterol lowering agent

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