centerpiece stringclasses 4
values | options sequence | correct_options sequence | correct_options_idx sequence | correct_options_literal sequence |
|---|---|---|---|---|
A 0.217 g sample of HgO (molar mass = 217 g) reacts with excess iodide ions according to the reaction shown above. Titration of the resulting solution requires how many mL of 0.10 M HCl to reach equivalence point? | [
"1.0 mL",
"10 mL",
"20 mL",
"50 mL"
] | [
"C"
] | [
2
] | [
"20 mL"
] |
Predict the number of lines in the EPR spectrum of a solution of 13C-labelled methyl radical (13CH3•), assuming the lines do not overlap. | [
"4",
"3",
"6",
"24"
] | [
"A"
] | [
0
] | [
"4"
] |
3 Cl−(aq) + 4 CrO_4^2−(aq) + 23 H+(aq) → 3 HClO2(aq) + 4 Cr3+(aq) + 10 H2O(l). In the reaction shown above, Cl−(aq) behaves as | [
"an acid",
"a base",
"a catalyst",
"a reducing agent"
] | [
"D"
] | [
3
] | [
"a reducing agent"
] |
Which of the following lists the hydrides of group-14 elements in order of thermal stability, from lowest to highest? | [
"PbH4 < SnH4 < GeH4 < SiH4 < CH4",
"PbH4 < SnH4 < CH4 < GeH4 < SiH4",
"CH4 < SiH4 < GeH4 < SnH4 < PbH4",
"CH4 < PbH4 < GeH4 < SnH4 < SiH4"
] | [
"A"
] | [
0
] | [
"PbH4 < SnH4 < GeH4 < SiH4 < CH4"
] |
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