General Science MCQ – 18 (Chemistry)

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1. Which of the following is not likely to exhibit hydrogen bonding?
(A) (CH₃)₃N
(B) H₂O
(C) CH₃NH₂
(D) NH₂OH

2. What is the mass of one mole of acetylsalicylic acid (aspirin), C₉H₈O₄?
(A) 27 g
(B) 30 g
(C) 29 g
(D) 28 g

3. Determine the number of moles of aluminum in 2.154 x 10 -1 kg of AI?
(A) 7.900 mol
(B) 8.983 mol
(C) 7.984 mol
(D) 8.950 mol

4. How many grams of zinc are there in 22.7 g of ZnCI2?
(A) 10.8 g
(B) 11.9 g
(C) 10.9 g
(D) 11.8 g

5. A compound with a composition of 87.5% and 12.5% H was recently discovered. What is the empirical formula for this compound?
(A) N₂H
(B) NH₂
(C) NH
(D) N₂H₃

6. The equation is unbalanced PCI₃ + H₂O → H₃PO₃ + HCI when it is it is correctly balanced, the coefficients are, respectively?
(A) 1,3,1,3
(B) 1,1,3,3
(C) 1,3,3,3
(D) 1,1,1,3

7. Given 6 mol of each reactant, which one would be limiting in the following reaction, 4Au + 8NaCN + O₂ + 2H₂O → 4NaAu(CN)₂ + 4NaOH?
(A) O₂
(B) Au
(C) NaCN
(D) H₂O

8. In the direct reaction of silicon with CI₂ the yield of SiCI₄ is 50%. How many grams of silicon must be reacted with excess chlorine in order to obtain 17g SiCI₄?
(A) 1.7g
(B) 16g
(C) 17g
(D) 15g

9. In the reaction of Fe3O4 with carbon to form carbon dioxide and iron, the number of moles of carbon required to convert 23 g of Fe₃O₄ to products is?
(A) 0.4
(B) 0.3
(C) 0.1
(D) 0.2

10. A 20.0 ml sample of an element with a density of 3.0 g/ml contains 4 x 10²³ atoms?
(A) 90
(B) 70
(C) 95
(D) 80

General Science MCQ – 153 (Chemistry)