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(A) Liquid helium $(b.p. \ 4.2 \ K)$ is used as a cryogenic agent for carrying out various experiments at low temperatures.It is used to produce and s

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$(i) \& (ii)$ only

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(A) Liquid helium $(b.p. \ 4.2 \ K)$ is used as a cryogenic agent for carrying out various experiments at low temperatures.It is used to produce and sustain powerful superconducting magnets,which are essential components of modern $NMR$ spectrometers and Magnetic Resonance Imaging $(MRI)$ systems for clinical diagnosis.Helium is a light,inert,and non-flammable gas.Therefore,statements $(i)$ and $(ii)$ are correct.

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.

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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.