What is believed to be the second most common element in the universe?

  • A
    $Helium$
  • B
    $Hydrogen$
  • C
    $Nitrogen$
  • D
    $Silicon$

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Among the following,which has the lowest enthalpy of fusion?

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Which of the following is $NOT$ true regarding the usage of hydrogen as a fuel?

Which of the following statements is not true for hydrogen:
$1)$ It exists as a diatomic molecule.
$2)$ It has one electron in the outermost shell.
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The natural relative abundance of isotopes of hydrogen is:

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