Classification of Elements and Periodicity in Properties

Multiple Choice Questions

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The first ionisation potential is maximum for :

  • B

  • N

  • O

  • Be

B.

N

Ionisation potential generally increase when we move in a period from left to right but IE1 of N2 is greater than that of O2 .It is due to the more stable (half-filled orbitals) configurations of N .

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    Which of the following element is a metalloid ?

    • Bi

    • Sn

    • Ge

    • C

    Answer

    Dominance of strong repulsive forces among the molecules of the gas (Z = compressibility factor)

    • depends on Z and indicated by Z = 1

    • depends on Z and indicated by Z > 1

    • depends on Z and indicated by Z < 1

    • is independent of Z.

    Answer

    Which of the follownig elements, is most electronegative ?

    • F

    • O

    • Ne

    • Na

    Answer

    The liquefied metal expanding on solidification is

    • Ga

    • Al

    • Zn

    • Cu.

    Answer
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    Which among the following elements have lowest value of IE1 ?

    • Pb

    • Sn

    • Si

    • C

    Answer

    The compound insoluble in water is

    • mercurous nitrate

    • mercuric nitrate

    • mercurous chloride

    • mercurous perchlorate.

    Answer

    Which of the following elements never show positive oxidation number ?

    • O

    • Fe

    • Ga

    • F

    Answer

    How does the ionisation energy of 1st group elements vary ?

    • Increases down the group

    • Decreases down the group

    • Remains unchanged

    • Variation is not regular

    Answer
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    Hydrogen in respect to chlorine, is :

    • electropositive

    • electronegative

    • neutral

    • none of the above

    Answer
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