Which of the following is not a metal?

(a) Gold

(b) mercury

(c) Scandium

(d) Selenium

Concept Questions :-

Modern Periodic Table
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The ions O2-, F-, Na+, Mg2+ and Al3+ are isoelectronic. Their ionic radii show [2003]

(a) an increase from O2- to F- and then decrease from Na+ to Al3+

(b) a decrease from O2- to F- and then increase from Na+ to Al3+

(c) a significant increase from O2- to Al3+

(d) a significant decrease from O2- to Al3+

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The example of metalloid elements in the periodic table is:

(a) Na and K

(b) Cu and Al

(c) B and Si

(d) Ca and Mg

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The element with atomic number 26 is:

(a) a non-metal

(b) krypton

(c) iron

(d) manganese

 

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The alkali metals have:

(a)highest ionization energy

(b)largest atomic radii

(c)highest density

(d)highest electronegativity

Concept Questions :-

Modern Periodic Table
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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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