Year: 2025
Topic: Classification of Elements and Periodicity in Properties
Time :
1.
Which of the following statements are true?
A. Unlike \(G_a\) that has a very high melting point, \(G_s\) has a very low melting point.
B. On Pauling scale, the electronegativity values of N and Cl are not the same.
C. Ar, K+, C-, Ca2+, and S2- are allisoelectronic species.
D. The correct order of the first ionization enthalpies of Na, Mg, Al, and Si is 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:
A. Unlike \(G_a\) that has a very high melting point, \(G_s\) has a very low melting point.
B. On Pauling scale, the electronegativity values of N and Cl are not the same.
C. Ar, K+, C-, Ca2+, and S2- are allisoelectronic species.
D. The correct order of the first ionization enthalpies of Na, Mg, Al, and Si is 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: