21. The formula for the hydronium ion is a. H2o d. HO e. HO 22. Which of the fol

Question

21. The formula for the hydronium ion is a. H2o d. HO e. HO 22. Which of the following is NOT a base a. NaOH b. CaCO c. NH3 d. BaO e. H3PO 23. According to the activity series, which if the following metals will NOT displace hydrogen from HCI a. Au b. Ni c. Fe d. Zn e. Mg 24. Calculate the number of moles of NaOH in 200.00 mL of a 0.200 M NaOH solutiorn a. 0.0400 mol b. 1.00 mol c. 40.0 mol d. 4.00 mol e. 1000.0 mol 25. Calculate the approximate mass of NaOH in the solution in Q24. a. 1.00 x 103 g b. 1.00 x 101g c. 1.00 x 103 g d. 40.0 g e. 1.60 g

Explanation / Answer

21. Ans : b

22. Ans : e

23. Ans : a (Au reduction potential is more than hydrogen, therefore Au will reduction).

24. Ans : a

Molarity = moles x 1000/ vollume in ml

0.2 = moles x 1000 / 200 = 0.04 moles

25. Ans : e

moles = weight / molecular weight

weight = moles x molecular weight

weight = 0.04 x 40 = 1.6 grams.

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