Select the correct molecular structure for the given species from the choices below:
PF6¯
A)pyramidal
B)tetrahedral
C)square planar
D)octahedral
E)none of these
Of the following, which form compounds?
A) I, II
B) II, III
C) I, II, III
D) II, III, IV
E) III, IV
Consider the set of isoelectronic atoms and ions A2-, B–, C, D+and E2+. Which
arrangement of relative radii is correct?
A)A2-> B–> C < D+> E2+
B)A2-< B–< C > D+< E2+
C)A2-> B–> C > D+> E2+
D)E2+> D+> C > B–> A2-
E)E2+< D+< C < B–< A2-
The bond angle in H2Se is about:
A)120°
B)60°
C)180°
D)109°
E)90°
How many significant figures are in 0.00110
A)2 C)4
B)3 D)5
How many protons, neutrons and electrons, in that order are present in the anion formed
by one atom of 125I?
A)53, 74, 54
B)52, 72, 53
C)54, 72, 53
D)53, 72, 54
E)54, 74, 54
Which of these statements is a consequence (follows from) the Law of Definite
Proportion?
A)All samples of chlorine contain 35Cl and 37Cl in the same (definite) ratio.
B)The mass of oxygen that is combined with a fixed mass of nitrogen in each of the
binary nitrogen oxides can be expressed as a ratio of small whole numbers.
C)The atomic masses of all of the elements in the periodic table have fixed values.
D)The % lead by mass in the compound galena is the same for all pure samples
obtained from any source.
E)None of these is correct
Which of the following statements is false?
A) HClO3is a weaker acid than HBr
B) H3PO3is a weaker acid than H3PO4
C) HClO3is a stronger acid than H3PO3
D) F–is a weaker base than Br–
E) The anion ClO3–is a weaker base than the anion H2PO3–
Which of the following molecules or ions does not contain a central atom with
sp2hybridization?
A)nitrate
B)carbonate
C)sulfite
D)C2H4
E)BF3
Which bond is most polar?
A)C-F
B)S-F
C)O-F
D)Si-F
E)C-O
Consider the molecule and the following hybridization choices:
What is the hybridization of the carbon atom that is bonded to chlorine?
A)sp
B)sp2
C)sp3
D)dsp3
E)d2sp3
You are told that metal X is a better reducing agent than metal Y. This must mean that:
A) X+is a better oxidizing agent than Y+.
B) X+is a better reducing agent than Y+.
C) Y is a better oxidizing agent than X.
D) Y+is a better reducing agent than X+.
E) Y+is a better oxidizing agent than X+.