14) As a pare element the oxidation number of zine is number is but in compounds

Question

14) As a pare element the oxidation number of zine is number is but in compounds such as ZnCOs its oxidation A) 0:0 B)0;+1 O+1:0 D)0; +2 E) none of the above 15) 2 AgNO3 (aq) + K2SO4(aq) 2 KNO3 (aqi + Ag2SO4(s) The net ionic reaction for the balanced equation shown above is A)Ag+ + NO 3 AgNO3. 2- 2- 16) 2 AgNO3 (aq) + K2SO4 (aq) 2 KNO3 (aq) + Ag2SO4 (s) The spectator ions in the reaction shown are B) potassium ion and sulfate ion. A) silver lon and nitrate ion. C) potassium ion and nitrate ion. D) silver ion and sulfate ion. E) hydrogen ion and hydroxide ion. 7) The formula weight of copper(II) chloride is A) 98.90 B) 133.00 C) 134.45 D) 162.53 E 197.80 18) How many molecules are present in 4.25 mol of CCl4? A) 9.26 x 1025 B) 2.56 x 1024 D) 153.81 C) 653.69 E) 36.91 19) 42.0 g Clh containsmolecules Cl2 A) 1.18 B)3.57 x 1023 C)3.57 x 1023 D)1.78 x 1023 E) 0.592

Explanation / Answer

14) oxidation no of pure zincZn=0, in ZnCO3 = +2 , ans =d , 17) formula weight of Cucl2 = 63.5 + 35.5 x2= 134.5 ans =c 18) no of molecules in 4.25 moles =4.25x6.022x10^23 = 2.56 x10^24 ,ans= B, 19) 71 gm of cl2 = 6.022 x10^23 molecules , molecules in 42 gm = 3.57 x10^23 ans =C

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