Chemistry #letspractice (Classification of Elements and Periodicity in Properties SET B

1.

Difference between electron gain enthalphy and electronegativity is described by :

1.	Valence electrons	2.	Atomic size
3.	Atomic radii	4.	Atomic number

2.

The formation of the oxide ion O^2-(g), from oxygen atom requires first an exothermic and
then an endothermic step as shown below,
$O (g) + e - \overset{}{\to} O^{-} (g); ∆_{f} H ° = - 141 {kJmol}^{- 1}$
$O^{-} (g) + e^{-} \overset{}{\to} O^{2 -} (g); ∆_{f} H ° = + 780 kJ {mol}^{- 1}$
Thus, process of formation of O^2- in gas phase is unfavourable even though O^2- is
isoelectronic with neon. It is due to the fact that
1. electron repulsion outweighs the stability gained by achieving noble gas configuration
2. O^- ion has comparatively smaller size than oxygen atom
3. Oxygen is more electronegative
4. addition of electron in oxygen result in large size of the ion

3.

Which of the following can affect the size of the iso-electronic species $\mathrm{Cl}^{-}, \mathrm{Ar} \text { and } \mathrm{Ca}^{2+}$?
1. Nuclear charge
2. Azimuthal quantum number of the valence shell
3. Electron-electron interaction in the outer orbitals
4. Principal quantum number of the valence shell

4. The correct order of electron gain enthalpies of Cl, F, Te, and Po is:
1. F < Cl < Te < Po
2. Po < Te < F < Cl
3. Te < Po < Cl < F
4. Cl < F < Te < Po

5. The element with atomic number 88 belongs to:
1. s ‐ block
2. p- block
3. d- block
4. f ‐ block

6. The correct arrangement of the filling of sub-shells in a ground state atom according to the Aufbau principle is:
1. 3s 3p 3d
2. 3p 4s 3d
3. 3d 4s 4p
4. 4p 4d 4f

7.

Which of the following statements are correct ?

(i)	Generally the radius trend and the ionization energy trend across a period are exact opposites.
(ii)	Electron affinity values of elements may be exothermic (negative) or endothermic (positive).
(iii)	The first ionization energy of sulphur is higher than that of phosphorus.
(iv)	$Te^{2-} > I^- > Cs^+ > Ba^{2+}$ represents the correct decreasing order of ionic radii.

1. (i), (iii) and (iv)
2. (ii), (iii) and (iv)
3. (i), (ii) and (iv)
4. (i), (ii) and (iii)

8. Calcium reacts with element X to form an ionic compound. If the ground-state electron configuration
of X is $1 s^2 2 s^2 2 p^4,$ what is the simplest formula for this compound?

1.	$\mathrm{CaX}$	2.	$\mathrm{CaX}_2 $
3.	$\mathrm{Ca}_4 X_2$	4.	$\mathrm{Ca}_2 \mathrm{X}_2$

9. $A, B$ and $C$ are hydroxy-compounds of the elements $X, Y$ and $Z$ respectively. $X, Y$ and $Z$ are in the same period of the periodic table. $A$ gives an aqueous solution of pH less than seven. $B$ reacts with both strong acids and strong alkalis. $C$ gives an aqueous solution which is strongly alkaline.

Which of the following statements is/are true?

I:	The three elements are metals.
II:	The electronegativities decrease from $X$ to $Y$ to $Z.$
III:	The atomic radius decreases in the order $X, Y$ and $Z.$
IV:	$X, Y$ and $Z$ could be phosphorus, aluminium and sodium respectively.

1. I, II and III are correct
2. I and IV are correct
3. II and IV are correct
4. II, III and IV are correct

10. The number of oxides among the following that exhibit an amphoteric nature is:
(a) $Na_2O$
(b) $As_2O_3$
(c) $NO$
(d) $N_2O$
(e) $Cl_2O_7$
1. 0
2. 1
3. 2
4. 3

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1.	\(\mathrm{CaX}\)	2.	\(\mathrm{CaX}_2 \)
3.	\(\mathrm{Ca}_4 X_2\)	4.	\(\mathrm{Ca}_2 \mathrm{X}_2\)

I:	The three elements are metals.
II:	The electronegativities decrease from \(X\) to \(Y\) to \(Z.\)
III:	The atomic radius decreases in the order \(X, Y\) and \(Z.\)
IV:	\(X, Y\) and \(Z\) could be phosphorus, aluminium and sodium respectively.

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