Periodic Classification Quiz No:16

Question No:1

Sc (Z = 21) is a transition element but Zn (Z = 30) is not because

[A] Both Sc and Zn do not exhibit variable oxidation states

[B] Both Sc3+ and Zn2+ ions are colourless and form white compounds

[C] In case of Sc, 3d orbitals are partially filled but in Zn these are filled

[D] Last electron is assumed to be added to 4s level in case of Zn

Question No:2

Iron exhibits + 2 and + 3 oxidation states . Which of the following statement about iron is incorrect ?

[A] Ferrous oxide is more basic in nature than the ferric oxide

[B] Ferrous compounds are relatively more ionic than the corresponding ferric compounds

[C] Ferrous compounds are more easily hydrolysed than the corresponding ferric compounds

[D] Ferrous compounds are less volatile than the corresponding ferric compounds

Question No:3

The increasing order of the ionic radii of the given isoelectronic species is

[A] Cl, Ca2+, K+, S2-

[B] S2-, CL, ca2+, K+

[C] Ca2+, K+, Cl, S2-

[D] K+, S2-, Ca2+, Cl

Question No:4

Among the following inert gas elements, the element that shows highest chemical reactivity is

[A] Xe

[B] Ne

[C] Ar

[D] He

Question No:5

Which one of the following sets contribute to the global warming ?

[A] H2, NO2, SO2

[B] SO2, SO3, O2

[C] N2, C2H6, SO3

[D] CO2, CH4, CFCs

Question No:6

Elements A, B and C belong to the same period in the long form of the periodic table. The nature of the oxides of A, B and C is Amphoteric, basic and acidic respectively. The correct order of the atomic number of these elements is

[A] B>A>C

[B] C>B>A

[C] C>A>B

[D] A>B>C

Question No:7

Which one of the following is the correct order of the size of the ions ?

[A] O2- > F> Mg2+> Na+

[B] Na+> Mg2+> F> O2

[C] O2 > F > Na+ > Mg2+

[D] Mg2+ > Na+ > F > O2+

Question No:8

Which of the following orders of ionic radii is correctly represented ?

[A] Na+>F>O2-

[B] F>O2->Na+

[C] Al3+> Mg2+> N3-

[D] H>H>H+

Question No:9

Be2+ is isoelectronic with which of the following ions ?

[A] Li+

[B] Na+

[C] Mg2+

[D] H+

Question No:10

Magnetic moment 2.83 is given by which of the following ions ?

(At. nos. Ti = 22, Cr = 24, Mn = 25, Ni = 28)

[A] Ni2+

[B] Cr3+

[C] Mn2+

[D] Ti3+

Question No:11

Reason of lanthanoid contraction is

[A] Increasing nuclear charge

[B] Decreasing nuclear charge

[C] decreasing screen .effect

[D] Negligible screening effect of T orbitals

Question No:12

Alkali metals have negative reduction potential and hence they behave as

[A] Oxidising agents

[B] Lewis bases

[C] Reducing agents

[D] Electrolytes

Question No:13

The electronic configuration of Cu2+ ion is

[A] [Ar] 3d8 4s1

[B] [Ar] 3d9 4s0

[C] [Ar] 3d7 4s2

[D] [Ar] 3d8 4S0

Question No:14

In which of the following options the order of arrangement does not agree with variation of property indicted against it?

[A] Al3+ < Mg2+ < Na+ < F (increasing ionic size)

[B] B

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