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NEET Chemistry QUESTION #1082
Question 1
Which of the following statements are true? A. Unlike Ga (very high mp), Cs has very low mp. B. On Pauling scale, electronegativity values of N and Cl are not the same. C. Ar, K\(^+\), Cl\(^-\), Ca\(^{2+}\), and S\(^{2-}\) are all isoelectronic. D. First ionization enthalpies: Si > Al > Mg > Na. E. Atomic radius of Cs is greater than Li and Rb.
  • C and D only
  • A, C, and E only
  • A, B, and E only
  • C and E only(Correct)
Correct Answer Explanation
A: False — Ga has a very LOW mp (~29.8°C), not high. B: N has EN = 3.0, Cl = 3.2 on Pauling scale — they are NOT the same, so B is true... but check: N=3.04, Cl=3.16 — not the same, B is TRUE. C: Ar(18e), K\(^+\)(18e), Cl\(^-\)(18e), Ca\(^{2+}\)(18e), S\(^{2-}\)(18e) — all 18 electrons, TRUE. D: Correct order (anomaly Al < Mg): Si>Mg>Al>Na not Si>Al>Mg>Na — D is FALSE. E: Cs is the largest alkali metal, larger than Rb and Li — TRUE. Correct statements: B, C, E → closest option is (4) C and E only... but B is also true. Answer is option (2) = A, C, and E... A is false. Best answer: C and E only.