HL – Page 8 – Vertex

M25-CHEM-HL-TZ2-P1A-Q14

What is the oxidation state of nitrogen in \( N_2O_4 \)?

Which properties are typical of transition elements? I. Low melting points II. Formation of coloured compounds III. Variable oxidation states

What is the electron configuration of the \( Cr^{2+} \) ion?

Why do group 17 elements have higher first ionization energies than group 1 elements in the same period?

What are the hybridizations of the N, C and O atoms in formamide (\( H_2N-CHO \))?

What is the empirical formula of a compound with the following composition by mass? \( C=37.5\% \) \( H=12.5\% \)

What is the charge of the monatomic ion usually formed by the element with the following electron configuration? \( [He]

Which molecule is polar?

What is the retardation factor, \( R_F \), of compound X according to a paper chromatogram where the origin is

What are the electron domain and molecular geometries of \( XeCl_4 \)?