Which of the following pairs have the same number of electrons? Fe^2+ and Fe^3+

Question

Which of the following pairs have the same number of electrons? Fe^2+ and Fe^3+ Ca^2+ and K^+ K^+ and Na^+ O_2^- and O^2- H^+ and H^- Give the ions present and their relative numbers in barium nitrate. 1 Ba^+ and 1 NO_3^- 2 Ba^+ and 1 NO_3^2- 1 Ba^2+ and 2 NO_3^- 1 Ba^2+ and 1 NO_2^2- 1 Ba^2+ and 2 NO_2^2- What is the correct name of KClO_4? potassium chlorate potassium perchlorite potassium perchlorate potassium hypochlorate potassium hypochlorite The formula of barium molybdate is BaMoO_4. Therefore, the formula of sodium molybdate is Na_4MoO. NaMoO. Na_2MoO_3. Na_2MoO_4. Na_4MoO_4. What is the weight percent of carbon in oxalic acid, H_2C_2O_4? 2.24% 13.34% 26.68% 34.52% 42.18% Which of the following compounds is 36.4% oxygen by mass? N_2O NO N_2O_3 N_2O_4 N_2O_5 Boron forms an extensive series of hydrides. If a hydride is isolated that is 81.1% B a possible molecular formula of the compound is B_2H_6 B_3H_9 B_4H_10 B_5H_9 B_5H_11

Explanation / Answer

44) Ca+2 = 18 electrons

K+ = 18 electrons.

so answer = option b.

45) bariumnitrate = Ba(NO3)2 = Ba+2   + 2NO3-

answer = option c = 1Ba+2  and 2 NO3-

46) KClO4 = potassium perchlorate

answer = option c = potassium perchlorate

47) Ba is dipositive while Na is monopositive so there must be 2 Na ions in the formula = Na2MoO4

answer = option d

48) H2C2O4 = 90 g/mol

C = 12g/mol

2C = 24 g

% C = (24 / 90) x 100 = 26.68

answer = option c

49) answer = option a = N2O

% O = (16 / 44) x 100 = 36.4

50) option c = B4H10

% B = (44 / 54) x100 = 81.4

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