Elements which generally exhibit multiple oxidation states and whose ions in aqueous medium are usually coloured aand whose ions in aqueous medium are usually coloured are:

(a) metalloids

(b) transition elements

(c) non-metals

(d) gases

Concept Questions :-

Modern Periodic Table
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Transition elements exhibit variable oxidation states because they release electrons from the following orbits:

(a) ns and np orbits

(b) (n-1)d and ns orbits

(c) (n-1)d orbits

(d) ns orbits

 

Concept Questions :-

Modern Periodic Table
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In II period most acidic oxide is formed by:

(a) F

(b) N

(c) O

(d) Li

Concept Questions :-

Nature of Compound
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Elements of group IB and IIB are called:

(a) normal elements

(b) transition elements

(c) alkaline earth metals

(d) alkali metals

Concept Questions :-

Modern Periodic Table
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Which element has the greatest tendency to lose electron?

(a) F

(b) Fr

(c) S

(d) Be

 

Concept Questions :-

Ionization Energy (IE)
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The outer electron configuration of Gd (Atomic no. 64) is:

(a) 4f3 5d56d2

(b) 4f8 5d106d2

(c) 4f4 5d46d2

(d) 4f7 5d16s2

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The radius of La3+ (at. no. 57) is 1.06 A° The radius of Lu3+ (at.no. 71) might be:

(a) 1.06  A°

(b) 0.85  A°

(c) 1.60  A°

(d) 1.40  A°

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Which of the following transition metal ions has the lowest density?

(a) Copper

(b) Nickel

(c) Scandium

(d) Zinc

Concept Questions :-

Modern Periodic Table
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Ionic radii are

[2004]

(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

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Which one of the following has the highest melting point?

(a) Na

(b) Mg

(c) K

(d) Al

 

Concept Questions :-

Lattice/Hydration Energy
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