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Ionic Radii and Ionisation Enthalpy (Group 2)

The first and...

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The first and second ionisation enthalpies (kJ/mol) of three elements A,B and c are given as A. B. C. (IE 1). 403. 549. 1142. 2640. 1040. 2080. Identify the element which is likely to be. (a) a non metal (b) an alkali metal (c) an alkaline earth metal.Also give reasons.

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Q. The first and second ionization energies (KJ mol

^{- 1}

) of three elements A, B, and C are given below.

	A	B	C
IE $_{1}$	402	650	1140
IE $_{2}$	2642	1060	2070

Identify the element which is likely to be an alkali-metal.

(I E_{1})

(I E_{2})

k J m o l^{- 1}

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

\begin{matrix} I & I I I E_{1} & 400 & 589 I E_{2} & 2510 & 1120 \end{matrix}

I

I I

respectively are likely to be?

Q. First and second I.E. of few elements given below:

	I.E $_{1}$ (kJ/mole)	I.E. $_{2}$ (kJ/mole)
(A)	520	730
(B)	1680	3380
(C)	2370	5250

Identify the above as alkaline earth metal, reactive non-metal and a noble gas?

Q. The first ionisation enthalpies of the alkaline earth metals are higher than that of alkali metals but second ionisation enthalpies are smaller, why?

Q. Identify the types of elements which are good reducing agents.
(a) Alkali metals
(b) Halogen elements
(c) Noble gases
(d) Alkaline earth metals
(e) Chalcogens

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