centerpiece stringclasses 4
values | options sequence | correct_options sequence | correct_options_idx sequence | correct_options_literal sequence |
|---|---|---|---|---|
Which of the following is expected to be a polar molecule? | [
"PCl4F",
"BF3",
"CO2",
"Si(CH3)4"
] | [
"A"
] | [
0
] | [
"PCl4F"
] |
From the solubility rules, which of the following is true? | [
"All chlorides, bromides, and iodides are soluble",
"All sulfates are soluble",
"All hydroxides are soluble",
"All ammonium-containing compounds are soluble"
] | [
"D"
] | [
3
] | [
"All ammonium-containing compounds are soluble"
] |
A new compound is synthesized and found to be a monoprotic acid with a molar mass of 248 g/mol. When 0.0050 mol of this acid are dissolved in 0.500 L of water, the pH is measured as 3.89. What is the pKa of this acid? | [
"3.89",
"7.78",
"5.78",
"2.33"
] | [
"C"
] | [
2
] | [
"5.78"
] |
A solution contains 2.00 mole of acetic acid, CH3COOH, and 1.00 mole of calcium acetate, Ca(CH3COO)2. The solution is able to resist the addition of a small amount of strong acid or strong base with only minor changes in the pH of the solution. Larger quantities of strong acid or strong base can cause a significant cha... | [
"0.500 mole",
"1.00 mole",
"2.00 mole",
"3.00 mole"
] | [
"C"
] | [
2
] | [
"2.00 mole"
] |
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