Trend in Atomic Radius

Q.

A FCC crystal of $O^{2-}$ (oxide) ion has ${Mn}^{n+}$ ions in all octahedral voids. Then value of n is

(1) 4

(2) 1

(3) 2

(4) 3

Q. The radius of nucleus is approximately times smaller than the radius of atom

Q. Lithium is more electronegative than Mg - True or False?

1. True

2. False

Q.

Ionization potential is lowest for

1. Halogens

2. Inert gases

3. Alkaline earth metals

4. Alkali metals

Q. For a given concentration, the ionic conductance in water is of the order:

1. Li⁺> Na⁺ >K⁺ >Rb⁺

2. Li⁺< Na⁺ <K⁺ <Rb⁺

3. Na⁺<K⁺ <Rb⁺<Li⁺

4. All ions will exhibit equalconductance

Q.

Which ion has greatest radius in the following

1. H^-

2. F^-

3. Br^-

4. I^-

Q. Element A (with minimum atomic number) in which last electron has n+m>3 but divisible by 3. How many given statements are correct about A? (n=Principal quantum number, m=magnetic quantum number) (i) Sum of group number and period number (in Modern Periodic table) is even number. (ii) Element belongs to s-block (iii) Element belongs to IIIA group number (iv) Element is a metal (v) Atomic number of element is divisible by 3. (vi) Another element B has an atomic number=atomic number of A+10, then element B belongs to IIIB group (vii) Element A has largest radius in their period. (viii) The group in which element is present, has maximum elements in the Modern Periodic Tab

Q. Which of the following transition involves maximum amount of energy?

1. 
2. 
3. 
4. 

Q. Which among the following gases have highest fraction of molecules moving with Uavg at 27^° C (1)H_2 (2)N_2 (3)O_{} (4)CO_2

Q. give reason despite their -i effect halogens are ortho and para directing in haloarenes

Q. Which of the following species are isoelectronic?

$i\left)Neii\right)O^{2-}iii\left)M{g}^{2+}iv\right)F$

$v\left)A{l}^{3+}vi\right)C{l}^{-}vii\left)Kviii\right)Na$

1. $Ne,O^{2-},M{g}^{2+},A{l}^{3+}$
2. $C{l}^{-},O^{2-},F,A{l}^{3+}$
3. $A{l}^{3+},C{l}^{-},M{g}^{2+},O^{2-}$
4. $Na,M{g}^{2+},C{l}^{-},Ne$

Q. Which of the following species are isoelectronic?

$i\left)Neii\right)O^{2-}iii\left)M{g}^{2+}iv\right)F$

$v\left)A{l}^{3+}vi\right)C{l}^{-}vii\left)Kviii\right)Na$

1. $Ne,O^{2-},M{g}^{2+},A{l}^{3+}$
2. $C{l}^{-},O^{2-},F,A{l}^{3+}$
3. $A{l}^{3+},C{l}^{-},M{g}^{2+},O^{2-}$
4. $Na,M{g}^{2+},C{l}^{-},Ne$

Q. The correct order of increasing radii are

1. 

2. 

3. 

4. 

Q. Which element has larger atomic volume, Na or K ? and why?

Q. The ratio of velocities of electron in first three orbit of He+ ions will be

Q. The correct order of increasing atomic radii among the elements $B,Al$ and $Ga$ is:

1. B < Al < Ga
2. Ga < Al < B
3. B < Ga < Al
4. Al < Ga < B

Q. The correct order of radii is

1. $F^{3+}<F{e}^{2+}<F{e}^{4+}$
2. $Na<Li<K$
3. $F^{-}<O^{2-}<N^{3-}$
4. $N<Be<B$

Q. The size of isoelectronic species $F{}^{-}$, $Ne$ and $Na{}^{+}$ is affected by :

Q. 70. Half mole of Helium gas is contained in a container at STP. Heat energy needed to double pressure of a gas , keeping the volume constant(heat capacity of gas =3j/gm K^° ) 1)3276j 2)1638j 3)819j 4)409.5j

Q. Which of the following orders of atomic radii is correct?

1. Zr > Hf
2. W > Mo
3. W ≈ Mo
4. Mo > W

Q.

In both I and VII group of the periodic table the following property increases with increase in atomic number

1. Oxidising property

2. Atomic size

3. Reactivity with water

4. Highest valency state

Q.

why hydration enthalpy decreases down the group?

Q. Set containing isoelectronic species is:

1. $C{O}_2,N{O}_2,O_2,N_2{O}_5$
2. $CO,NO,O_2,CN$
3. $C_2^{2-},N{O}^{+},C{N}^{-},O_2^{2+}$
4. $CO,C{O}_2,NO,N{O}_2$

Q. At ${25}^{\circ }C$, the total pressure of an ideal solution obtained by mixing $3\text{mol}$ of ${}^{\prime }{A}^{\prime }$ and $2\text{mol}$ of ${}^{\prime }{B}^{\prime }$, is $184\text{torr}$. What is the vapour pressure (in $\text{torr}$) of pure ${}^{\prime }{B}^{\prime }$ at the same temperature (Vapour pressure of pure ${}^{\prime }{A}^{\prime }$ at ${25}^{\circ }C$ is $200\text{torr}$)?

1. $140$
2. $160$
3. $100$
4. $180$

Q.

The elements A [At. No. 2] has atomic mass 4. Write the number of protons, number of electrons, and electronic configuration of the element and hence, state whether the elements is noble gases and why

Q. Among $N{a}^{+},Na,Mg$ and $M{g}^{2+}$, the largest particle is:

1. $M{g}^{2+}$
2. $Mg$
3. $Na$
4. $N{a}^{+}$

Q.

how are the elements classified into four blocks s, p, d, f? what are representative elements

Q.

Which is the valence shell electronic configuration of group 14 elements?

1. ns¹np⁴

2. ns²np²

3. ns²np⁴

4. ns²np⁶

Q. Due to lanthanide contraction _________.

Q.

Which of the following represents the correct order of increasing first ionization enthalpy for Ca, Ba, S, Se and Ar?

1. S< Se < Ca < Ba < Ar

2. Ba < Ca < Se < S < Ar

3. Ca < Ba < S < Se < Ar

4. Ca < S < Ba < Se < Ar