Chemistry - PERIODIC TABLE Question with Solution | TestHub
A, B and C are hydroxide of the elements X, Y and Z respectively. X, Y and Z are in the period of the periodic table. 'A' give an aqueous solution of pH less than seven. B reacts with both strong acid and strong alkali. C gives an aqueous solution which is strongly alkaline. Which of the following statements is/are true?
Options:(select one or more)
Answer:
Solution:
Based on the properties of the hydroxides in the 3rd period, Z is sodium (Na) (strongly alkaline NaOH), Y is aluminum (Al) (amphoteric Al(OH)₃), and X is phosphorus (P) (acidic oxyacid/hydroxide).
Statement (A) is false because phosphorus (X) is a non-metal, not a metal.
Statement (B) is true because electronegativity increases across a period (), meaning it decreases from X to Y to Z.
Statement (C) is true because atomic radius decreases across a period, following the trend .
Statement (D) is true as it correctly identifies the elements X, Y, and Z as P, Al, and Na.
