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- #Classification of elements and periodicity in properties
- #Medical
- #Chemistry
- #National Eligibility Cum Entrance Test
Q.69) Which of the following statements are true?
A. Unlikel $G a$ that has a very high melting poinf, Cs has a very low melting point.
B. On Pauling scale, the electronegativity values of N and Cl are not the same.
C. $\mathrm{Ar}, \mathrm{K}_{\star} \mathrm{Cl}^{-}, \mathrm{Ca}^{2+}$, and $\mathrm{S}^{2-}$ are all isoelectronic species.
D. The correct order of the first ionization enthlpies of $\mathrm{Na}, \mathrm{Mg}, \mathrm{Al}$, and Si is $\mathrm{Si}>\mathrm{Al}>\mathrm{Mg}>\mathrm{Na}$.
E. The atomic radius of Cs is greater than that of Li and Rb .
Choose the correct answer from the options given belopy:
A) A, C and E only
B) $\mathrm{A}, \mathrm{B}$, and E only
C) C and E only
D) C and D only
Answers (1)
Ga (Gallium) indeed has low high melting point too - so not true
Cs (Caesium) has a very low melting point (about $28.5^{\circ} \mathrm{C}$ )
In option C, all are isoelectronic ( $\mathrm{Ar}=18 \mathrm{e}^{-}, \mathrm{Cl}^{-}=18 \mathrm{e}^{-}$, etc.).
Cs has a large atomic radius as atomic radius increases down the group.
Hence, the correct answer is option (3).
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