Periodicity

Q.

why is electron affinty of sulphur greater than oxygen

Q. Explain why Ccl₄ cannot be hydrolysed? Also explain what is hyrodysis.!?

Q. The one with the lowest electron affinity in group $16$ is:

1. Oxygen
2. Sulphur
3. Selenium
4. Tellurium

Q.

Why are alkali metals not found in nature?

Q. What is meant by inert pair effect? explain.

Q. Among $A{l}_2{O}_3,Si{O}_2,P_2{O}_3$ and $S{O}_2$ the correct order of acid strength is:

1. $A{l}_2{O}_3<Si{O}_2<S{O}_2<P_2{O}_3$
2. $Si{O}_2<S{O}_2<A{l}_2{O}_3<P_2{O}_3$
3. $S{O}_2<P_2{O}_3<Si{O}_2<A{l}_2{O}_3$
4. $A{l}_2{O}_3<Si{O}_2<P_2{O}_3<S{O}_2$

Q. Hlw is the subshell electronic configuration of 1s2 2s2 2p6?

Q.

Why 'O' group elements have practically zero Electron Affinity?

Q.

From the elements $\mathrm{Li},\mathrm{K},\mathrm{Mg},\mathrm{C},\mathrm{Al},$ and $\mathrm{S}$, identify the

(A) Elements belonging to the same group.

(B) The element which has the tendency to lose two electrons.

(C) The element which prefers sharing of electrons to complete its octet.

(D) Most metallic element.

(E) The element that forms acidic oxide.

(F) The element that belongs to group 13.

Q. Which one of the following characteristics of the transition metals is associated with their catalytic activity?

1. High enthalpy of atomization
2. Paramagnetic behaviour
3. Colour of hydrated ions
4. Variable oxidation states

Q.

According to Fajan’s rule, covalent bond is favoured by:

1. Small cation and large anion

2. Small cation and small anion

3. Large cation and large anion

4. Large cation and small anion

Q.

The similarities in the properties of a group of elements are because they have the same _____ (atomic number, electronic configuration, number of outer electrons ).

Q.

What are the first $36$ elements according to their atomic number?

Q.

Noble gases have positive electron gain enthalpy.Explain

Q. Which has greater second electron affinity : sulphur or oxygen? why?

Q. which of the following has highest electron affinity?
1) Li+
2) Na+
3) O-
4) F-

Q.

The number of unpaired electrons in [V(H₂O)6]³⁺ is:

1. 1

2. 4

3. 3

4. 2

Q.

What type of oxide would Eka aluminium form?

1. ${\mathrm{EO}}_3$

2. ${\mathrm{E}}_3{\mathrm{O}}_2$

3. ${\mathrm{E}}_2{\mathrm{O}}_3$

4. $\mathrm{EO}$

Q. In closest packing of A type of atoms (radius, rA), the radius of atom B that can be fitted into Octahedral void is

1. 0.732 r_A

2. 0.125 r_A

3. 0.414 r_A

4. 0.155 r_A

Q.

Along a period, atomic volume of the elements gradually increases from left to right due to an increase in the number of valence electrons.

1. True
2. False

Q. Electron affinity is positive, when

1. $O$ changes into $O^{-}$
2. $O^{-}$ changes into $O^{2-}$
3. $O$ changes into $O^{+}$
4. Electron affinity is always negative

Q. The option(s) with only amphoteric oxides is(are)

1. $C{r}_2{O}_3,BeO,SnO,Sn{O}_2$
2. $C{r}_2{O}_3,CrO,SnO,PbO$
3. $NO,B_2{O}_3,PbO,Sn{O}_2$
4. $ZnO,A{l}_2{O}_3,PbO,Pb{O}_2$

Q. $\left[Xe\right]4f^{14}5d^{10}6s^{2}6p^3$ ​
Which of the following element represents the above electronic configuration?

1. P
2. Bi
3. As
4. Sb

Q. Are edta^4- and NCS^1- weak or strong ligands? On bonding with central metal atom will these form high or low spin complexes?

Q. Which of the following elements with atomic numbers 25, 30, 48 and 80 has the highest vapour pressure at room temperature?

1. Z = 30

2. Z = 48

3. Z = 80

4. Z = 25

Q. Three moles of electrons are passed through threesolutions in succession containing AgNO3, CuS0and AuCl3, respectively. The molar ratio of amounts of cations reduced at cathode will be(1) 1 2: 3(2) 3 21(4) 6 3:2

Q.

Write down the outermost electronic configurations of alkali metals. How will you justify their placement in group 1 of the periodic table?

Q. At critical point in Andrews isotherm which of the following is a correct statement:

1. Liquid - vapor equilibrium exist
2. Substance may change from liquid to gas phase
3. Substance may change from gas to liquid phase
4. All of the above

Q.

Which element is a metalloid?

1. Z=5

2. Z=10

3. Z=15

4. Z=20

Q.

What is the common thing in the elements belonging to the same group?