Anionic Radius

Q. The ions $O^{2–},F^{–},N{a}^{+},M{g}^{2+}$ and $A{l}^{3+}$ are isoelectronic. Their ionic radii show:

1. A significant decrease from $O^{2–}$ to $A{l}^{3+}$
2. A decrease from $O^{2–}$ to $F^{–}$ and then increase from $N{a}^{+}$ to$A{l}^{3+}$
3. A significant increase from $O^{2–}$ to $A{l}^{3+}$
4. An increase from $O^{2–}$ to $F^{–}$ and then decrease from $N{a}^{+}$ to $A{l}^{3+}$

Q. 29. the speed of electrons in the second orbit of Be3+ ions will be: a)c/137 b)2c/137 c)3c/137 d)4c/137

Q.

The tenth elements in the periodic table resembles with the

1. Second period

2. Fourth group

3. First period

4. Ninth group

Q. The hydration energy of $M{g}^{2+}$ is larger than that of (J1984, 1M)

1. $A{l}^{3+}$
2. $N{a}^{+}$
3. $B{e}^{2+}$
4. $M{g}^{3+}$

Q. An ion M^+3 has electronic configuration [Ar] 3d10 4s2 element M belongs to

Q. what is the electronic configuration of CN^{}(Cyanide ion) according to MOT and why?

Q.

Which is smallest in size

1. C^4-

2. O^2-

3. F^-

4. N^3-

Q.

The shape of $S{O}_4^{2-}$ ion is

1. Square planar

2. Tetrahedral

3. Trigonal bipyramidal

4. Hexagonal

Q.

Which of the following is the smallest in size?

1. $O^{2-}$

2. $C^{4-}$

3. $F^{-}$

4. $N^{3-}$

Q.

Which one of the following ions has the highest value of ionic radius

1. O^2-

2. B³⁺

3. Li⁺

4. F^-

Q. how size of H+ ion responsible for no existence of H+ as free ion

Q. Choose the correct statement(s) :
(Assume 100% ionisation)

1. $\text{Van't Hoff factor for}{K}_{2}S{O}_4(aq.)\text{is}2$
2. $\text{Van't Hoff factor for}KCl(aq.)\text{is}0.5$
3. $\text{Van't Hoff factor for}{K}_{2}S{O}_4(aq.)\text{is}3$
4. $\text{Van't Hoff factor for}KCl(aq.)\text{is}2$

Q.

Boron generally forms:

1. Electron-deficient compound

2. Does not form any compound at all

3. Electron rich compound

4. Electron precise compound

Q. 30. If quantum number of element are given such as n, l, m, s then how to find period and group of element.

Q.

Which of the following is the smallest in size?

1. $O^{2-}$

2. $C^{4-}$

3. $F^{-}$

4. $N^{3-}$

Q. Which of the following has the largest ionic radius?

1. $N{a}^{+}$
2. $K^{+}$
3. $M{g}^{++}$
4. $A{l}^{3+}$
5. $C{l}^{-}$

Q.

The radii of $F,F^{-},O$ and $O^{2-}$ are in the order of

1. $O^{2-}>F^{-}>O>F$

2. $O^2->F^{-}>F>O$

3. $F^{-}>O^{2-}>F>O$

4. $O^{2-}>O>F^{-}>F$

Q. Calculate the velocity of an electron placed in the second orbit of $L{i}^{2+}$ ion

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1. $4.23\times {10}^{6}m.s^{-1}$
2. $3.27\times {10}^{6}m.s^{-1}$
3. $3.27\times {10}^{6}cm.s^{-1}$
4. $0.521m.s^{-1}$

Q. 13.Of speen quantum no. Has four different valies then no. Of elements in third period of periodic table

Q. Which cation has smallest radius

1. $K^{+}$
2. $N{a}^{+}$
3. $L{i}^{+}$
4. $B{e}^{2+}$