If 25 g of O_2 are mixed with 25 g of H_2 and the mixture is ignited to form liq

Question

If 25 g of O_2 are mixed with 25 g of H_2 and the mixture is ignited to form liquid water, what is the limiting reagent? 2 H_2(g) + O_2(g) rightarrow 2H_2O(I) (a) There is no limiting reagent (b) O_2 (c) H_2O (d) H_2 (e) Both H_2 and O_2 are limiting reagents 19. The correct formula unit for aluminum sulfate is (a) AI_3S_2 (b) AI_2(SO_4)_3 (c) AIS_2 (d) AI_2SO_4 (e) AI_2S_3 20. The melting point of nitrogen is 63 K. This temperature corresponds to: (a) 63 degreeC (b) -63 degreeC (c) -210 degreeC (d) 273 degreeC (e) 336 degreeC 21. Which of the following atoms has the largest atomic radius? (a) K (b) C (c) F (d) N (e) B 22. Which of the following species has the smallest ionization energy? (a) K (b) Ar (c) Br (d) Ci (e) Ca 23. 10.0 liters of CO_2 at 25 degreeC is confined in a piston. What is the new volume of CO_2, if the temperature is raised to 50 degreeC white the pressure on the piston is held constant? (a) 12.5 liters (b) 5.0 liters (c) 20.0 liters (d) 5.4 liters (e) 10.8 liters 24. For the neutralization reaction between HC_2H_3O_2(aq) and NaOH_(aq), the net ionic equation contains all the following species except. (a) H^+(aq) (b) HC_2H_3O_2 (aq) (c) H_2O (d) OH^-(aq) (e) C_2H_3O_2^-(aq) 25. Which two species are isoelectronic? (a) Br^- and CI^- (b) Mg^2- and Na^+ (c) CI^- and Na^+ (d) O^2- and CI^- (e) AI^3+ and Ar 26. When mixing equal volumes of 0.4 M lead nitrate and 0.4 M potassium carbonate solutions (a) no net reaction will occur (b) a gas will be evolved (c) a precipitate will form (d) neutralization will occur (e) decomposition will occur 27. Which of the follwing compounds has a zero dipole moment? (a) HCI (b) CS_2 (c) H_2O (d) NH_3 (e) SO_2

Explanation / Answer

18) The number of mols of O2 is less as per stoichiometry, hence it is limiting reactant.Hence answer is b)

19) b)

20) c)
21) a)

22) a)

23) According to Charles law- V1/V2 = T1/T2 , hence 10.80 L is the answer.

24) a)

25) b)

26) c)

27) b)

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