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Periodic Table and Periodicity question

2025 · Q106
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Periodic Table and Periodicity question

2025 · Q106

NEETChemistryPeriodic Table and PeriodicityMCQ+4 / −1

Which of the following statements are true?

A. Unlike Ga that has a very high melting point, Cs has a very low melting point.

B. On Pauling scale, the electronegativity values of N and Cl are not the same.

C. Ar,K+,Cl−,Ca2+\mathrm{Ar}, \mathrm{K}^{+}, \mathrm{Cl}^{-}, \mathrm{Ca}^{2+}Ar,K+,Cl−,Ca2+, and S2−\mathrm{S}^{2-}S2− are all isoelectronic species.

D. The correct order of the first ionization enthalpies of Na,Mg,Al\mathrm{Na}, \mathrm{Mg}, \mathrm{Al}Na,Mg,Al, and Si is Si>Al>Mg>Na\mathrm{Si}>\mathrm{Al}>\mathrm{Mg}>\mathrm{Na}Si>Al>Mg>Na.

E. The atomic radius of Cs is greater than that of Li and Rb.

Choose the correct answer from the options given below :

  1. A
    C and D only
  2. B
    A, C, and E only
  3. C
    A, B, and E only
  4. D
    C and E only
View written solutionFree

Correct answer: D

Both Ga and Cs have low melting points.

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ElementMelting point/K
Ga303
Cs302

$\bullet$ On Pauling scale, the electronegativity value of N and Cl have same (3.0).

$\bullet$ $\mathrm{Ar}, \mathrm{K}^{+}, \mathrm{Cl}^{-}, \mathrm{Ca}^{2+}$ and $\mathrm{S}^{2-}$ have 18 electrons. So these are isoelectronic species.

$\bullet$ The correct order of first ionization enthalpy is $\mathrm{Si}>\mathrm{Mg}>\mathrm{Al}>\mathrm{Na}$

First ionisation enthalpy of Mg is higher than Al because the penetration of a 3 s -electron to the nucleus is more than that of a 2 p -electron.

$\bullet$ Generally down the group atomic radii increases

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AtomAtomic radius/pm
Li152
Rb244
CS262
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