Which of the following statements in relation to the hydrogen atom is correct ?

3s, 3p and 3d orbitals all have the same energy

3s and 3p orbitals are of lower energy than 3d orbital

3p orbital is lower in energy than 3d orbital

3s orbital is lower in energy than 3p orbital

In context with the industrial preparation of hydrogen from water gas (CO + H 2 ), which of the following is the correct statement?

CO and H 2 , are fractionally separated using differences in their densities

CO is removed by absor ption in aqueous Cu 2 Cl 2 solution

H 2 is removed through occlusion with pd

CO is oxidised to CO 2 with steam in the presence of a catalyst followed by absorption of of CO 2 in alkali

Very pure hydrogen (99.9) can be made by which of the following processes ?

Mixing natural hydrocarbons of high molecular weight

Reaction of salts like hydrides with water

Which one of the following statement regarding helium is incorrect ?

It is used to produce and sustain powerful superconducting magnets

It is used as a cryogenic agent for carrying out experiments at low temperatures

It is used to fill gas balloons instead of hydrogen because it is lighter and non-inflammable

It is used in gas-cooled nuclear reactors

Beyllium and aluminium exhibit many properties which are similar. But, the two elements differ in

exhibiting maximum covalency in compounds

exhibiting amphoteric nature in their oxides

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