Order of first ionisation enthalpy for a set of elements

1. A.
   $Al < Mg < Si < S < P$
2. B.
   $Al < Mg < S < Si < P$
3. C.
   $Mg < Al < Si < S < P$
4. D.
   $Mg < Al < Si < P < S$

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1. A.
   $Mg < S < Al < P$
2. B.
   $Mg < Al < S < P$
3. C.
   $Al < Mg < S < P$
4. D.
   $Mg < Al < P < S$

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1. A.
   O $<$ N $<$ B $<$ Be
2. B.
   Be $<$ B $<$ N $<$ O
3. C.
   B $<$ Be $< N < O$
4. D.
   B $<$ Be $<$ O $<$ N

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1. A.
   (A) $<$ (B) $<$ (C) $<$ (D)
2. B.
   (B) $<$ (A) $<$ (D) $<$ (C)
3. C.
   (B) $<$ (D) $<$ (A) $<$ (C)
4. D.
   (B) $<$ (A) $<$ (C) $<$ (D)

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1. A.
   Li $<$ Be $<$ B $<$ C $<$ N $<$ O $<$ F
2. B.
   B $>$ Li $>$ Be $>$ C $>$ N $>$ O $>$ F
3. C.
   $Li < B < Be < C < O < N < F$
4. D.
   $Li < Be < B < C < O < N < F$

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1. A.
   $Si$
2. B.
   $Al$
3. C.
   $N$
4. D.
   $C$

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1. A.
   B $<$ D $<$ C $<$ E $<$ A
2. B.
   E $<$ C $<$ A $<$ B $<$ D
3. C.
   C $<$ E $<$ A $<$ B $<$ D
4. D.
   A $<$ B $<$ D $<$ C $<$ E

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1. A.
   $Al < Si < S < P < Cl$
2. B.
   $Al < S < P < Si < Cl$
3. C.
   $Si < S < Al < P < Cl$
4. D.
   $S < Si < Al < P < Cl$

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