aas For which one of the following does chtorine have does an oxidation number o

Question

aas For which one of the following does chtorine have does an oxidation number of zero? A Cl 027. in the reaction, CosNiO element is reduced? A. Co B. Ni azs 10g of Nac is diss solved in 100g of water, what is the molality (m) of this solution? A. 0.1 B. 10 C. 1.7 If 10g of NaOH is molarity (M) of this solution? az9. dissolved in water to make 100ml of solution, what is the A. 0.25 B. 0.1 C. 10 D. 2.5 o. What is the mole fraction of NaOH if 1 mole of water? NaOH is dissolved in 4 moles of 0.2 B. 0.25 C. 4 D. 5 5

Explanation / Answer

24. in peroxides oxygen oxidation number is -1
     B. -1
25. CH3COOH is weak acid. It is weak electrolyte.
   A.CH3COOH
26.free state atoms of molecules oxidation number is zero
    A.Cl2
27. Ni oxidation number decreases from +4 to +2. So Ni is reduced
    B. Ni
28.molality = W*1000/G.M.Wt * weight of solvent in g
            = 10*1000/58.5*100 = 1.7m
C.1.7
29. molarity = W*1000/G.M.Wt * volume of solution in ml
            = 10*1000/40*100 = 2.5M
   D.2.5
30.mole fraction of NaOH = no of moles of NaOH/no of moles of NaOH + no of mols of water

                         = 1/1+4 = 1/5 = 0.2
A.0.2

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