Water is not effective in extinguishing a fire caused by petrol because?

  • (A) Water and petrol react chemically
  • (B) Water and petrol are miscible with each other
  • (C) Flame is too hot for water to cool it down
  • (D) Water and petrol are immiscible with each other and petrol which forms the upper layer continues to bum

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  • What is carbamide?
    • (A) A Textile Dye
    • (B) A Fertilizer
    • (C) A Pesticide
    • (D) An explosive
  • Lustre of the metals is because of?
    • (A) High density due to closed packing of atoms.
    • (B) High polish.
    • (C) Reflection of light due to the presence of free electrons.
    • (D) Absorption of light due to the presence of cavities.

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