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CHXI03:CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES

313323 Correct orders of 1st I.P. are
(i) Li < B < Be < C
(ii) O < N < F
(iii) Be < N < Ne

1 (i), (ii)

2 (ii), (iii)

3 (i), (iii)

4 (i), (ii), (iii)

CHXI03:CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES

313324 When the ionization energy $v / s$ atomic number is plotted for the elements, of atomic number 11 to 18 , two peaks are observed for the element $X$ and $Y$ in between the curve. What is the difference between atomic number of element $X$ and element $Y$ ?

1 2

2 1

3 3

4 6

Explanation:

$\begin{matrix} N a & M g & A l & S i & P & S & C l & A r \\ 3 s^{1} & 3 s^{2} & 3 p^{1} & 3 p^{2} & 3 p^{3} & 3 p^{4} & 3 p^{5} & 3 p^{6} \end{matrix}$
I.E. $= Ar > Cl > P > S > Si > Mg > Al > Na$
Peaks are observed for $Mg (z = 12)$ and $P (z = 15)$
$∴$ Difference in $z = 15 - 12 = 3$

CHXI03:CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES

313325 When Lithium vapour is taken in a discharge tube and the potential difference between the electrodes is 5.4 eV, there is a sudden increase in the flow of current. The IE of Lithium per mole is

1

54 e v / a t o m

2

520 k J m o l^{- 1}

3

54 k J a t o m^{- 1}

4

5 .4 e v a t o m^{- 1}

Explanation:

$I E = 5 .4 e V (1 e V = 96 .54 k J / m o l)$

CHXI03:CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES

313326 $I E_{1} a n d I E_{2}$ of magnesium are 178 and 348 kcal/ mole. The energy for the reaction
$M g_{(g)} \to {M g}_{(g)}^{2 +} + 2 e^{-}$

1

+ 170 k c a l

2

+ 526 k c a l

3

- 170 k c a l

4

- 526 k c a l

CHXI03:CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES

313327 The value of $I P_{1}, I P_{2}, I P_{3} a n d I P_{4}$ of an atom are respectively 7.5 eV, 25.6 eV, 48.6 eV and 170.6 eV. The electronic configuration of the atom will be

1

1 s^{2}, 2 s^{2}, 2 p^{6}, 3 s^{1}

2

1 s^{2}, 2 s^{2}, 2 p^{6}, 3 s^{2}, 3 p^{1}

3

1 s^{2}, 2 s^{2}, 2 p^{6}, 3 s^{2}, 3 p^{3}

4

1 s^{2}, 2 s^{2}, 2 p^{6}, 3 s^{2}

CHXI03:CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES

313323 Correct orders of 1st I.P. are
(i) Li < B < Be < C
(ii) O < N < F
(iii) Be < N < Ne

1 (i), (ii)

2 (ii), (iii)

3 (i), (iii)

4 (i), (ii), (iii)

CHXI03:CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES

313324 When the ionization energy $v / s$ atomic number is plotted for the elements, of atomic number 11 to 18 , two peaks are observed for the element $X$ and $Y$ in between the curve. What is the difference between atomic number of element $X$ and element $Y$ ?

1 2

2 1

3 3

4 6

Explanation:

$\begin{matrix} N a & M g & A l & S i & P & S & C l & A r \\ 3 s^{1} & 3 s^{2} & 3 p^{1} & 3 p^{2} & 3 p^{3} & 3 p^{4} & 3 p^{5} & 3 p^{6} \end{matrix}$
I.E. $= Ar > Cl > P > S > Si > Mg > Al > Na$
Peaks are observed for $Mg (z = 12)$ and $P (z = 15)$
$∴$ Difference in $z = 15 - 12 = 3$

CHXI03:CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES

313325 When Lithium vapour is taken in a discharge tube and the potential difference between the electrodes is 5.4 eV, there is a sudden increase in the flow of current. The IE of Lithium per mole is

1

54 e v / a t o m

2

520 k J m o l^{- 1}

3

54 k J a t o m^{- 1}

4

5 .4 e v a t o m^{- 1}

Explanation:

$I E = 5 .4 e V (1 e V = 96 .54 k J / m o l)$

CHXI03:CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES

313326 $I E_{1} a n d I E_{2}$ of magnesium are 178 and 348 kcal/ mole. The energy for the reaction
$M g_{(g)} \to {M g}_{(g)}^{2 +} + 2 e^{-}$

1

+ 170 k c a l

2

+ 526 k c a l

3

- 170 k c a l

4

- 526 k c a l

CHXI03:CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES

313327 The value of $I P_{1}, I P_{2}, I P_{3} a n d I P_{4}$ of an atom are respectively 7.5 eV, 25.6 eV, 48.6 eV and 170.6 eV. The electronic configuration of the atom will be

1

1 s^{2}, 2 s^{2}, 2 p^{6}, 3 s^{1}

2

1 s^{2}, 2 s^{2}, 2 p^{6}, 3 s^{2}, 3 p^{1}

3

1 s^{2}, 2 s^{2}, 2 p^{6}, 3 s^{2}, 3 p^{3}

4

1 s^{2}, 2 s^{2}, 2 p^{6}, 3 s^{2}

CHXI03:CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES

313323 Correct orders of 1st I.P. are
(i) Li < B < Be < C
(ii) O < N < F
(iii) Be < N < Ne

1 (i), (ii)

2 (ii), (iii)

3 (i), (iii)

4 (i), (ii), (iii)

CHXI03:CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES

313324 When the ionization energy $v / s$ atomic number is plotted for the elements, of atomic number 11 to 18 , two peaks are observed for the element $X$ and $Y$ in between the curve. What is the difference between atomic number of element $X$ and element $Y$ ?

1 2

2 1

3 3

4 6

Explanation:

$\begin{matrix} N a & M g & A l & S i & P & S & C l & A r \\ 3 s^{1} & 3 s^{2} & 3 p^{1} & 3 p^{2} & 3 p^{3} & 3 p^{4} & 3 p^{5} & 3 p^{6} \end{matrix}$
I.E. $= Ar > Cl > P > S > Si > Mg > Al > Na$
Peaks are observed for $Mg (z = 12)$ and $P (z = 15)$
$∴$ Difference in $z = 15 - 12 = 3$

CHXI03:CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES

313325 When Lithium vapour is taken in a discharge tube and the potential difference between the electrodes is 5.4 eV, there is a sudden increase in the flow of current. The IE of Lithium per mole is

1

54 e v / a t o m

2

520 k J m o l^{- 1}

3

54 k J a t o m^{- 1}

4

5 .4 e v a t o m^{- 1}

Explanation:

$I E = 5 .4 e V (1 e V = 96 .54 k J / m o l)$

CHXI03:CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES

313326 $I E_{1} a n d I E_{2}$ of magnesium are 178 and 348 kcal/ mole. The energy for the reaction
$M g_{(g)} \to {M g}_{(g)}^{2 +} + 2 e^{-}$

1

+ 170 k c a l

2

+ 526 k c a l

3

- 170 k c a l

4

- 526 k c a l

CHXI03:CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES

313327 The value of $I P_{1}, I P_{2}, I P_{3} a n d I P_{4}$ of an atom are respectively 7.5 eV, 25.6 eV, 48.6 eV and 170.6 eV. The electronic configuration of the atom will be

1

1 s^{2}, 2 s^{2}, 2 p^{6}, 3 s^{1}

2

1 s^{2}, 2 s^{2}, 2 p^{6}, 3 s^{2}, 3 p^{1}

3

1 s^{2}, 2 s^{2}, 2 p^{6}, 3 s^{2}, 3 p^{3}

4

1 s^{2}, 2 s^{2}, 2 p^{6}, 3 s^{2}

CHXI03:CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES

313323 Correct orders of 1st I.P. are
(i) Li < B < Be < C
(ii) O < N < F
(iii) Be < N < Ne

1 (i), (ii)

2 (ii), (iii)

3 (i), (iii)

4 (i), (ii), (iii)

CHXI03:CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES

313324 When the ionization energy $v / s$ atomic number is plotted for the elements, of atomic number 11 to 18 , two peaks are observed for the element $X$ and $Y$ in between the curve. What is the difference between atomic number of element $X$ and element $Y$ ?

1 2

2 1

3 3

4 6

Explanation:

$\begin{matrix} N a & M g & A l & S i & P & S & C l & A r \\ 3 s^{1} & 3 s^{2} & 3 p^{1} & 3 p^{2} & 3 p^{3} & 3 p^{4} & 3 p^{5} & 3 p^{6} \end{matrix}$
I.E. $= Ar > Cl > P > S > Si > Mg > Al > Na$
Peaks are observed for $Mg (z = 12)$ and $P (z = 15)$
$∴$ Difference in $z = 15 - 12 = 3$

CHXI03:CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES

313325 When Lithium vapour is taken in a discharge tube and the potential difference between the electrodes is 5.4 eV, there is a sudden increase in the flow of current. The IE of Lithium per mole is

1

54 e v / a t o m

2

520 k J m o l^{- 1}

3

54 k J a t o m^{- 1}

4

5 .4 e v a t o m^{- 1}

Explanation:

$I E = 5 .4 e V (1 e V = 96 .54 k J / m o l)$

CHXI03:CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES

313326 $I E_{1} a n d I E_{2}$ of magnesium are 178 and 348 kcal/ mole. The energy for the reaction
$M g_{(g)} \to {M g}_{(g)}^{2 +} + 2 e^{-}$

1

+ 170 k c a l

2

+ 526 k c a l

3

- 170 k c a l

4

- 526 k c a l

CHXI03:CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES

313327 The value of $I P_{1}, I P_{2}, I P_{3} a n d I P_{4}$ of an atom are respectively 7.5 eV, 25.6 eV, 48.6 eV and 170.6 eV. The electronic configuration of the atom will be

1

1 s^{2}, 2 s^{2}, 2 p^{6}, 3 s^{1}

2

1 s^{2}, 2 s^{2}, 2 p^{6}, 3 s^{2}, 3 p^{1}

3

1 s^{2}, 2 s^{2}, 2 p^{6}, 3 s^{2}, 3 p^{3}

4

1 s^{2}, 2 s^{2}, 2 p^{6}, 3 s^{2}

CHXI03:CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES

313323 Correct orders of 1st I.P. are
(i) Li < B < Be < C
(ii) O < N < F
(iii) Be < N < Ne

1 (i), (ii)

2 (ii), (iii)

3 (i), (iii)

4 (i), (ii), (iii)

CHXI03:CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES

313324 When the ionization energy $v / s$ atomic number is plotted for the elements, of atomic number 11 to 18 , two peaks are observed for the element $X$ and $Y$ in between the curve. What is the difference between atomic number of element $X$ and element $Y$ ?

1 2

2 1

3 3

4 6

Explanation:

$\begin{matrix} N a & M g & A l & S i & P & S & C l & A r \\ 3 s^{1} & 3 s^{2} & 3 p^{1} & 3 p^{2} & 3 p^{3} & 3 p^{4} & 3 p^{5} & 3 p^{6} \end{matrix}$
I.E. $= Ar > Cl > P > S > Si > Mg > Al > Na$
Peaks are observed for $Mg (z = 12)$ and $P (z = 15)$
$∴$ Difference in $z = 15 - 12 = 3$

CHXI03:CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES

313325 When Lithium vapour is taken in a discharge tube and the potential difference between the electrodes is 5.4 eV, there is a sudden increase in the flow of current. The IE of Lithium per mole is

1

54 e v / a t o m

2

520 k J m o l^{- 1}

3

54 k J a t o m^{- 1}

4

5 .4 e v a t o m^{- 1}

Explanation:

$I E = 5 .4 e V (1 e V = 96 .54 k J / m o l)$

CHXI03:CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES

313326 $I E_{1} a n d I E_{2}$ of magnesium are 178 and 348 kcal/ mole. The energy for the reaction
$M g_{(g)} \to {M g}_{(g)}^{2 +} + 2 e^{-}$

1

+ 170 k c a l

2

+ 526 k c a l

3

- 170 k c a l

4

- 526 k c a l

CHXI03:CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES

313327 The value of $I P_{1}, I P_{2}, I P_{3} a n d I P_{4}$ of an atom are respectively 7.5 eV, 25.6 eV, 48.6 eV and 170.6 eV. The electronic configuration of the atom will be

1

1 s^{2}, 2 s^{2}, 2 p^{6}, 3 s^{1}

2

1 s^{2}, 2 s^{2}, 2 p^{6}, 3 s^{2}, 3 p^{1}

3

1 s^{2}, 2 s^{2}, 2 p^{6}, 3 s^{2}, 3 p^{3}

4

1 s^{2}, 2 s^{2}, 2 p^{6}, 3 s^{2}

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