When the first electron gain enthalpy ( ΔH eg ) of oxygen is - 141 kJ / mol , its second electron gain enthalpy is:

Almost the same as that of the first

Negative, but less negative than the first

A more negative value than the first

In general, the properties that decrease and increase down a group in the periodic table, respectively, are :

Electronegativity and atomic radius

Atomic radius and electronegativity

Electronegativity and electron gain enthalpy

Electron gain enthalpy and electronegativity

E M B I B E

Alpha Question Bank for Medical: Chemistry>Chapter 12 - Classification of Elements and Periodicity in Properties>Exercise 1>Q 52

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Earn 100

S.No. Element Code Atomic radius (pm)

$(i)$ $Be$ $(p)$ $74$

$(ii)$ $C$ $(q)$ $88$

$(iii)$ $O$ $(r)$ $111$

$(iv)$ $B$ $(s)$ $77$

$(v)$ $N$ $(t)$ $66$

Match the correct option:

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Important Questions on Classification of Elements and Periodicity in Properties

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Alpha Question Bank for Medical: Chemistry>Chapter 12 - Classification of Elements and Periodicity in Properties>Exercise 1>Q 53

Match list

- I

with list

- II

and select the correct answer using the codes given below -

	List $- I$ lon		List $- II$ Radius
$(I)$	${Li}^{+}$	$(1)$	$216$
$(II)$	${Na}^{+}$	$(2)$	$195$
$(III)$	${Br}^{-}$	$(3)$	$60$
$(IV)$	$I^{-}$	$(4)$	$95$

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Alpha Question Bank for Medical: Chemistry>Chapter 12 - Classification of Elements and Periodicity in Properties>Exercise 1>Q 54

Which of the following order of atomic / ionic radius is not correct?

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Alpha Question Bank for Medical: Chemistry>Chapter 12 - Classification of Elements and Periodicity in Properties>Exercise 1>Q 55

Which one of the following statements is incorrect in relation to ionisation enthalpy?

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Alpha Question Bank for Medical: Chemistry>Chapter 12 - Classification of Elements and Periodicity in Properties>Exercise 1>Q 56

The first ionisation enthalpies (in

eV

) of

N & O

are, respectively given by:

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Alpha Question Bank for Medical: Chemistry>Chapter 12 - Classification of Elements and Periodicity in Properties>Exercise 1>Q 57

The first ionisation enthalpies of

Na, Mg, Al

and

Si

are in the order:

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Alpha Question Bank for Medical: Chemistry>Chapter 12 - Classification of Elements and Periodicity in Properties>Exercise 1>Q 58

Which electronic configuration of neutral atoms will have the highest first ionisation energy?

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Alpha Question Bank for Medical: Chemistry>Chapter 12 - Classification of Elements and Periodicity in Properties>Exercise 1>Q 59

The first ionisation energy is smallest for the atom with electronic configuration:

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Alpha Question Bank for Medical: Chemistry>Chapter 12 - Classification of Elements and Periodicity in Properties>Exercise 1>Q 60

The first ionisation energy will be maximum for:

Learn and Prepare for any exam you want !

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S.No.	Element	Code	Atomic radius (pm)
$(i)$	$Be$	$(p)$	$74$
$(ii)$	$C$	$(q)$	$88$
$(iii)$	$O$	$(r)$	$111$
$(iv)$	$B$	$(s)$	$77$
$(v)$	$N$	$(t)$	$66$

S.No. Element Code Atomic radius (pm) i Be p 74 ii C q 88 iii O r 111 iv B s 77 v N t 66 Match the correct option:

Important Questions on Classification of Elements and Periodicity in Properties

Learn and Prepare for any exam you want !

S.No. Element Code Atomic radius (pm)

$(i)$ $Be$ $(p)$ $74$

$(ii)$ $C$ $(q)$ $88$

$(iii)$ $O$ $(r)$ $111$

$(iv)$ $B$ $(s)$ $77$

$(v)$ $N$ $(t)$ $66$

Match the correct option: