QUESTION 22 What is the oxidation number of Cl in HClO 2 ? +5 +3 -2 +4 -4 0.7143
ID: 833442 • Letter: Q
Question
QUESTION 22
What is the oxidation number of Cl in HClO2?
+5
+3
-2
+4
-4
0.7143 points
QUESTION 23
What period 3 element having the following ionization energies (all in kJ/mol)?
IE1 = 1012; IE2 = 1900; IE3 = 2910; IE4= 4960; IE5= 6270; IE6 = 22,200
P
Mg
S
Si
Cl
0.7143 points
QUESTION 24
Write the formula for copper(II) sulfate heptahydrate.
Cu2SO . H2O
Cu2SO3. H7
CuSO4.7H2O
CuS . 5H2O
(CuSO4)II
0.7143 points
QUESTION 25
What mass of oxygen (in kilograms) is contained in 3.00 gallons of ethanol (C2H5OH)? (The density of ethanol is 0.789 g/mL; 1 gal = 3.785 L).
8.50 x 10-3 kg O
9.97 x 103 kg O
2.03 kg O
3.11 kg O
1.94 kg O
0.7143 points
QUESTION 26
Which one of the following compounds is insoluble in water?
NaCl
KI
KNO3
AgCl
No correct answer is given.
0.7143 points
QUESTION 27
How many different values of l are possible in the third principal level?
4
3
0
2
1
0.7143 points
QUESTION 28
According to the following reaction, how much energy is evolved during the reaction of 32.5g B2H6 and 72.5 g Cl2? [The molar mass of B2H6 is 27.67 g/mol. The molar mass of Cl2 is 70.90 g/mol.]
B2H6(g) + 6 Cl2(g) => 2 BCl3(g) + 6 HCl(g) ?Horxn= -1396 kJ
238 kJ
3070 kJ
1640 kJ
429 kJ
1430 kJ
+5
+3
-2
+4
-4
Explanation / Answer
1. 3
The oxidation state of O is always -2 except when in peroxides and F2O.
Since there are 2 O, the total oxidation states for O is 2 x (-2) = -4.
The overall charge for HClO2 is 0. Therefore, the total sum of all the oxidation states is equal to 0. Hence,
(+1) + (Cl) + (-4) = 0
(Cl) + (-3) = 0
(Cl) = +3
2. Phosphorus as it is increasing.
3.CuSO4.7H2O
4. 3 gallons = 11.355 litres
so mass 0.789 x 1000x 11.355 = 8959 grams of ethanol
ethanol mass is 46 and oxygen mass is 16
so it will be 16*8959/46 = 3116 grams or 3.11 kg
5. agcl generally all compounds of silver do not dissolve in water or have limited solubility in it
6. 3 (0,1,2)
7.cl2 is limiting agent here.
so it will be 1396*72.5/70.9*6 = 238 kJ
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