Ionisation Energy

Q. The successive ionization energies for element $X$ are given below:
$I{E}_1=250{\text{kJ mol}}^{-1}$
$I{E}_2=820{\text{kJ mol}}^{-1}$
$I{E}_3=1100{\text{kJ mol}}^{-1}$
$I{E}_4=1400{\text{kJ mol}}^{-1}$
Find out the number of valence electrons from the element $X$.

1. $3$
2. $4$
3. $2$
4. $1$

Q. Among the following which one has the highest cation to anion size ratio?

1. $CsI$
2. $CsF$
3. $NaF$
4. $LiF$

Q. Give the reasons for the following :

(i) The size of a $C{l}^{-}$ ion is greater than the size of a $Cl$ atom.

Q. From the given molar conductivities infinite dilution, calculate ${\lambda }_m^{\infty }$ for $N{H}_{4}OH$.
${\lambda }_m^{\infty }\text{for}Ba(OH{)}_2=457.6oh{m}^{-1}c{m}^{2}mo{l}^{-1}.$
${\lambda }_m^{\infty }\text{for}Ba\left(C{l}_2\right)=240.6oh{m}^{-1}c{m}^{2}mo{l}^{-1}.$
${\lambda }_m^{\infty }\text{for}N{H}_{4}Cl=128.8oh{m}^{-1}c{m}^{2}mo{l}^{-1}.$

1. $-238.3oh{m}^{-1}c{m}^{2}mo{l}^{-1}$
2. $212.6oh{m}^{-1}c{m}^{2}mo{l}^{-1}$
3. $338.4oh{m}^{-1}c{m}^{2}mo{l}^{-1}$
4. $238.3oh{m}^{-1}c{m}^{2}mo{l}^{-1}$

Q.

Among lanthanoid la^{​​​​​la3+} & lu^{​​​​​3+} ions are

A)paramagnetic B)Diamagnetic C) ferromagnetic

D)All of these

Please with explaination

Q. Which of the following isoelectronic ions have lowest ionization?

1. $N{a}^{+}$
2. $M{g}^{2+}$
3. $F^{-}$
4. $O^{2-}$

Q.

Among the statements (I–IV), the correct ones are:

(I) $\mathrm{Be}$ has a smaller atomic radius compared to $\mathrm{Mg}$.

(II) $\mathrm{Be}$ has higher ionization enthalpy than $\mathrm{Al}$.

(III) Charge/radius ratio of $\mathrm{Be}$ is greater than that of $\mathrm{Al}$.

(IV) Both $\mathrm{Be}$ and $\mathrm{Al}$ form mainly covalent compounds.

1. (I), (II) and (IV)

2. (I), (II) and (III)

3. (II), (III) and (IV)

4. (I), (III) and (IV)

Q. Why is IE of Be is greater than B?

Q.

Arrange F, Cl, O, N in the decreasing order of electronegativity

1. Cl > F > N > O

2. F > O > N > Cl

3. F > N > Cl > O

4. O > F > N > Cl

Q. State Kohlrausch's law of independent migration of ions. Why does the conductivity of a solution decrease with dilution?

Q. The decreasing order of the first ionization energy of group 16 elements is:

1. 
2. 
3. 
4. None of the above

Q.

Successive ionization enthalpies of an element 'X' are given below

IE1. IE2. IE3. IE4

165. 195. 556. 595

Electronic configuration of the element'X' is?

Q. Calculate the percentage volume occupied in CsCl crystal structure with derivation whole

Q. $CuS{O}_4.5H_{2}O$ is blue in colour while $CuS{O}_4$ is colourless. Why?

Q. From the ground state electronic configuration of the elements given below, which has the highest value of second ionization energy?

1. $1s^{2}2s^{2}2p^{6}3s^2$
2. $1s^{2}2s^{2}2p^{6}3s^1$
3. $1s^{2}2s^{2}2p^6$
4. $1s^{2}2s^{2}2p^5$

Q. The highest first ionisation energy among the following elements.

1. $Cl$
2. $Cs$
3. $I$
4. $Li$

Q.

Why are 13th group elements able to form covalent bond?

Q. How is chemical reactivity determined?

Q. 73 The activation energy of a first order reaction at 300 kelvin is 60 kilojoules per mole .in the presence of a catalyst the activation energy gets lowered to 50 kilojoules per mole at 300 Kelvin. how many times the reaction rate changes in the presence of the catalyst at the same temperature?

Q.

What is ionization enthalpy?

Q.

it is said that in the valence shell of lithium one proton is pulling one electron and in berilium two protons are pulling two electrons. but the atomic radius of lithium is bigger than berilium.if the amount of attraction according to their valency will be equal. then why?

Q. The thermal stability of hydrides of oxygen family is in order:
[1 Mark]

1. $H_{2}Po<H_{2}Te<H_{2}Se<H_{2}S<H_{2}O$
2. $H_{2}Po<H_{2}O<H_{2}Te<H_{2}Se<H_{2}S$
3. $H_{2}S<H_{2}O<H_{2}Te<H_{2}Se<H_{2}Po$
4. $H_{2}O<H_{2}S<H_{2}Te<H_{2}Se<H_{2}Po$

Q. 38.Which solution will have least vapour pressure 1) 0.1 molar Barium Chloride 1) 0.1 molar urea 3) 0.1 molar sodium sulphate 4) 0.1 molar sodium phosphate

Q. Which of the following metal ion forms unstable complex with CN^- :- 1) Ag(I) 2) Zn(II) 3) Cu(II) 4) Cr (II)

Q.

The first ionisation enthalpies (kj/mol)for Li , Be , B and C have one of the following values. Which of these corresponds to that of boron ?

1. 520

2. 1086

3. 899

4. 800

Q. how to calculate the oxide and hydride formula for elements in group 8 in mendeleevs periodic table

Q. In a solid, $P$ atoms form $FCC,Q$ atoms are present in alternate edge centres, $R$ in alternate tetrahedral voids. If $P$ atoms on the two face centres are replaced by $X$ atoms, then the formula of the compounds is

1. $P_3{Q}_2{R}_{4}X$
2. $P_2{Q}_2{R}_3{X}_2$
3. $P_{3}Q{R}_{4}X$
4. $P_{4}Q{R}_4{X}_2$

Q. What is the correct decreasing order of reactivity towards $S_{N}1$ reaction for given molecule?

1. a > b > c > d
2. d > b > c > a
3. b > d > a > c
4. b > a > d > c

Q. The pyknometric density of sodium chloride crystal is $2.165\times {10}^{3}kg{m}^{-3}$ while its X-ray density is $2.178\times {10}^{3}kg{m}^{-3}$. The fraction of unoccupied sites in sodium chloride crystal is:

1. $5.96\times {10}^{-2}$
2. $5.96\times {10}^{-1}$
3. $5.96\times {10}^{-3}$
4. $5.96$

Q. what is complete reactionof AsH3+HgCl2