Which of the following sets of quantum numbers is correct for an electron in 4f orbital ? [2004]

n = 4, ℓ = 3, m = + 1, s = + ½

n = 4, ℓ = 4, m = – 4, s = – ½

n = 4, ℓ = 3, m = + 4, s = + ½

n = 3, ℓ = 2, m = – 2, s = + ½

The correct order of thermal stability of the hydrides of group 16 elements is

H 2 Po> H 2 Fe> H 2 Se> H 2 S > H 2 O

H 2 O<H 2 S>H 2 Se>H 2 Te>H 2 Po

H 2 O=H 2 S=H 2 Se-H 2 Te=H 2 Po

H 2 O>H 2 S>H 2 SE>H 2 Te>H 2 Po

A relation R in a set A is called reflexive,

If (b, b) ∈ R, for every a ∈ A

If (b, a) ∈ R, for every a, b ∈ A

If (a, b) ∈ R, for every a, b ∈ A

If (a, a) ∈ R, for every a ∈ A

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