The telluric helix was given by:

(a) Newland

(b) Mendeleev

(c) Lothar Meyer

(d) De-chancourtois

Concept Questions :-

Please attempt this question first.

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The element with atomic number 30 is expected to be present in:

(a) IB group

(b) IA group

(c) IIA group

(d) IIB group 

Concept Questions :-

Electronic Configuration
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The correct order of acid strength is:

(a) Cl2O7>SO2>P4O10

(b) CO2>N2O5>SO3

(c) Na2O>MgO>Al2O3

(d) K2O>CaO>MgO

Concept Questions :-

Nature of Compound
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Which is called a bridge element?

(a)Li

(b)O

(c)Mg

(d)Pb

Concept Questions :-

Modern Periodic Table
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Four successive members of the first row transition elements are listed below with their atomic numbers. Which one of them is expected to have the highest third ionisation enthalpy?

                                                                                                              [2005]

(a) Vanadium (Z = 23)

(b) Chromium (Z = 24)

(c) Iron (Z = 26)

(d) Manganese (Z = 25)

Concept Questions :-

Ionization Energy (IE)
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Transition elements show:

(a) variable valency

(b) paramagnetism

(c) catalytic properties

(d) all of these

Concept Questions :-

Modern Periodic Table
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The transition elements are more metallic than the representative elements because they have:

(a) the electrons in d-orbitals

(b) electron pairs in d-orbitals

(c) availability of d-orbitals for bonding

(d) unpaired electrons in metallic orbitals

 

Concept Questions :-

Modern Periodic Table
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Which pair has elements containing same number of electrons in the ourtermost orbit?

(a) N, O

(b) Na, Ca

(c) As, Bi

(d) Pb, Sb

Concept Questions :-

Electronic Configuration
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Chloride of an  element A gave a neutral solution in water. In the periodic table the element A belongs to

(1) First group

(2) Third group

(3) Fifth group

(4) Transitional metal

Concept Questions :-

Stability of Compound
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The correct arrangement of increasing order of atomic radius among Na, K, Mg and Rb is 

(1) Mg<K<Na<Rb

(2) Mg<Na<K<Rb

(3) Mg<Na<Rb<K

(4) Na<K<Rb<Mg

Concept Questions :-

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