Which statements among the following are correct about Helium? (i) Liquid helium is used to sustain powerful…

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.
  1. (i) & (ii) only
  2. (ii) & (iii) only
  3. (i) & (iv) only
  4. (iii) & (iv) only

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 NMRNMR spectrometers and Magnetic Resonance Imaging (MRI) systems for clinical diagnosis. 

Asked in: AP EAMCET 2021 (19 Aug Shift 2)

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