2 23. Which of the following would be the most difficult to remove an electron f

Question

2 23. Which of the following would be the most difficult to remove an electron from?- on-from? a) N 10 b) Sb 24. In the ionic compound TiO2, titanium, Ti, must c)Cr d) Sr Y2 Fr (24Y a) gain four electrons from oxygen to become Ti. b) lose four electrons to oxygen to become Ti** c) make a double bond to each oxygen. d) make two single bonds to each oxygen. e) lose two electrons to oxygen to become T2 7 25. te molarity of a solution if you add 138 g of potassium carbonate to 2 liter of water? a) 1.38 M b) 0.5 M c) 276 M 0.69 M e) 1.0 M 2 138 12 26. How many grams of LiOH are needed to neutralize 40 g of HE2 3 HF + LiOH LiF + H2O a) 20 g 229 b) 24 g d) 40 g e) 48 g 27. Which of the following is true regarding a cup of water and a swimming pool full of water if both of them are at 40 °C? The cup of water has more heat The swimming pool has more heat c) The cup and pool both have the same average kinetic energy. a and c e) b and c 28. What is the correct formula for barium nitrate? a) BaNO3 ) Ba(NO3)2 c) Ba2NO3 d) BaNO2 e) Ba3(NO3)2

Explanation / Answer

23. answer: a (ionisation enegry increases,by decreasing size, presence of hal filled (or) fully filled orbitals.)

24. answer: b

25. Molarity(M) = (w/M)*(1/V)

                = (138/138.2)*(1/2)

                = 0.5 M

answer: b

26. no of mol of HF = 40/20 = 2 mol

   no of mol of LiOH required = 2 mol

mass of LiOH required = 2*24 = 48 g

answer: e

27. answer: C

28. answer: b

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