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AP EAMCET202119 Aug 2021Evening ShiftChemistryp Block Elements (Group 15, 16, 17 & 18)Actual

Which statements among the following are correct about Helium? (i) Liquid helium is used to sustain powerful superconducting magnets. (ii) Liquid helium is useful to carry low temperature experiments. (iii) It is a heavy gas. (iv) It is a flammable gas.

Options

  1. A(i) & (ii) only
  2. B(ii) & (iii) only
  3. C(i) & (iv) only
  4. D(iii) & (iv) only

Correct answer

A. (i) & (ii) only

Step-by-step solution

Liquid helium ( b . p .   4 . 2   K ) finds its use as cryogenic agent for carrying out various experiments at low temperatures. It is used to produce and sustain powerful superconducting magnets which form an essential part of modern NMR NMR spectrometers and Magnetic Resonance Imaging ( MRI ) systems for clinical diagnosis.

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