71. Ionic radii are

A inversely proportional to effective nuclear charge
B inversely proportional to square of effective nuclear charge
C directly proportional to effective nuclear charge
D directly proportional to square of effective nuclear charge
Answer :   inversely proportional to effective nuclear charge
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72. The correct order of the decreasing ionic radii among the following isoelectronic species is

A $$C{a^{2 + }} > {K^ + } > {S^{2 - }} > C{l^ - }$$
B $$C{l^ - } > {S^{2 - }} > C{a^{2 + }} > {K^ + }$$
C $${S^{2 - }} > C{l^ - } > {K^ + } > C{a^{2 + }}$$
D $${K^ + } > C{a^{2 + }} > C{l^ - } > {S^{2 - }}$$
Answer :   $${S^{2 - }} > C{l^ - } > {K^ + } > C{a^{2 + }}$$
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73. Which pair of elements belongs to same group ?

A Elements with atomic no. 17 and 38
B Elements with atomic no. 20 and 40
C Elements with atomic no. 17 and 53
D Elements with atomic no. 11 and 33
Answer :   Elements with atomic no. 17 and 53
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74. In the long form of periodic table, the non-metals are placed in

A $$s$$ - block
B $$p$$ - block
C $$d$$ - block
D $$f$$ - block
Answer :   $$p$$ - block
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75. Which of the following is not an actinoid ?

A Curium $$\left( {Z = 96} \right)$$
B Californium $$\left( {Z = 98} \right)$$
C Uranium $$\left( {Z = 92} \right)$$
D Terbium $$\left( {Z = 65} \right)$$
Answer :   Terbium $$\left( {Z = 65} \right)$$
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76. What were the main demerits of Mendeleev's periodic table?
(i) Hydrogen has been placed in group I though it resembles to group VII as well.
(ii) Position of some elements was not justified.
(iii) Isotopes were not given separate places.
(iv) Lanthanides and actinides were not included in the table.

A (i), (ii) and (iii)
B (i), (ii), (iii) and (iv)
C (ii) and (iv)
D (i), (iii) and (iv)
Answer :   (i), (ii), (iii) and (iv)
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77. In the periodic table from left to right in a period, the atomic volume

A decreases
B increases
C remains same
D first decrease then increases
Answer :   first decrease then increases
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78. The correct sequence which shows decreasing order of the ionic radii of the elements is

A $$A{l^{3 + }} > M{g^{2 + }} > N{a^ + } > {F^ - } > {O^{2 - }}$$
B $$N{a^ + } > M{g^{2 + }} > A{l^{3 + }} > {O^{2 - }} > {F^ - }$$
C $$N{a^ + } > {F^ - } > M{g^{2 + }} > {O^{2 - }} > A{l^{3 + }}$$
D $$O{\,^{2 - }} > {F^ - } > N{a^ + } > M{g^{2 + }} > A{l^{3 + }}$$
Answer :   $$O{\,^{2 - }} > {F^ - } > N{a^ + } > M{g^{2 + }} > A{l^{3 + }}$$
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79. Atomic radii of fluorine and neon in $$\mathop {\text{A}}\limits^ \circ $$ngstorm units are respectively given by

A $$0.72,1.60$$
B $$1.60,1.60\,$$
C $$0.72,0.72\,\,$$
D None of these values
Answer :   $$0.72,1.60$$
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80. Meitnerium is IUPAC official name of an element with atomic number

A 113
B 118
C 104
D 109
Answer :   109
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Practice More MCQ Question on Chemistry Section

Physical ChemistrySome Basic Concepts in ChemistryStoichiometryStates of Matter Solid, Liquid and GasAtomic StructureChemical ThermodynamicsSolutionsSolid StateSurface ChemistryChemical EquilibriumIonic EquilibriumChemical KineticsRedox ReactionElectrochemistryNuclear Chemistry
Inorganic ChemistryChemical Bonding and Molecular StructureOres and MetallurgyClassification of Elements and Periodicity in PropertiesHydrogenS - Block ElementsP - Block ElementsD and F Block ElementsCo - ordination CompoundsQualitative AnalysisPreparation and Properties of CompoundsEnvironmental Chemistry
Organic ChemistryGeneral Organic ChemistryIsomerismPurification and Characterisation of Organic CompoundsHydrocarbons (Alkane, Alkene and Alkyne)Aromatic hydrocarbonElectrophilic Aromatic Substitution (Haloalkanes and Haloarenes)Alkyl and Aryl HalideReactions on BenzeneAlcohol, Phenol and EtherAldehyde and KetoneCarboxylic AcidOrganic Compounds Containing NitrogenName ReactionsPolymersBiomoleculesChemistry in Everyday LifePractical Organic Chemistry