Which substance is used to produce very low temperatures by magnetic effects?

  • A
    Pyrophoric mischmetal
  • B
    Uranium
  • C
    Thorium
  • D
    Gadolinium sulphate

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Indicate the steps in the preparation of:
$(i)$ $K_2Cr_2O_7$ from chromite ore.
$(ii)$ $KMnO_4$ from pyrolusite ore.

Which of the following statements is false?

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