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Standard XII

Chemistry

Trend in Ionisation Enthalpy

The first I...

Question

The first ( $I E_{1}$ ) and second ( $I E_{2}$ ) ionization energies (kJ/mol) of a few elements designated by Roman numerals are given below. Which of these would be an alkali metal?

I E_{1}

2372

I E_{2}

5251

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I E_{1}

520

I E_{2}

7300

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III

I E_{1}

900

I E_{2}

1760

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I E_{1}

1680

I E_{2}

3380

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Solution

The correct option is A II $I E_{1}$ 520 $I E_{2}$ 7300
Alkali metals have the lowest $I E_{1}$ values in their respective periods. Also, there is a large jump between $I E_{1}$ and $I E_{2}$ due to the removal of the second electron from the noble gas core. Therefore, out of the given $I E_{1}$ and $I E_{2}$ values, (II) belongs to alkali metals.

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Similar questions

Q. The

(I E)_{1}

and the

(I E)_{2}

in kJ mol

^{- 1}

of a few elements designated by Roman numerals are shown below

Element	$(I E)_{1}$	$(I E)_{2}$
A	2372	5251
B	520	7300
C	900	1760
D	1680	3380

Based on above information, Which represents a noble gas ?

Q. The ionization enthalpies,

(I E)_{1}

and the

(I E)_{2}

in kJ mol

^{- 1}

of a few elements designated by Roman numerals are shown below :

Element	$(I E)_{1}$	$(I E)_{2}$
A	2372	5251
B	520	7300
C	900	1760
D	1680	3380

Which of the above elements form a stable binary halide of the formula

M X_{2}

Q. The

{(I E)}_{1}

an dthe

{(I E)}_{2}

in kJ

{m o l}^{- 1}

of few elements designated by Roman numerals are shown below:

Element

{(I E)}_{1}

{(I E)}_{2}

1 2372 5251 2 520 7300 3 900 1760 4 1680 3380 Which of the above elements is likely to be a (a) reactive metal (b) reactive non-metal (c) noble gas (d) metal that forms a stable binary halide of the

{A X}_{2}

Write the sequence of your answer.

Q. Which represents alkali metals based on

(I E_{1})

and

(I E_{2})

values?

		$(I E)_{1}$	$(I E)_{2}$
(a)	X	100	110
(b)	Y	95	120
(c)	Z	195	500
(d)	M	200	250

{(I E)}_{1}

and

{(I E)}_{2}

in kJ

{m o l}^{- 1}

of K and Ca have been given as

	${(I E)}_{1}$	${(I E)}_{2}$
K	419	3052
Ca	590	1145

The difference can be explained by:

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The first (IE1) and second (IE2) ionization energies (kJ/mol) of a few elements designated by Roman numerals are given below. Which of these would be an alkali metal?

The first ( $I E_{1}$ ) and second ( $I E_{2}$ ) ionization energies (kJ/mol) of a few elements designated by Roman numerals are given below. Which of these would be an alkali metal?