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# AS question watch

1. (Original post by TeachChemistry)
Chlorine is more reactive than iodine.

Chloride is not more reactive than iodide.

Chlorine would react with iodide to give chloride and iodine. But you do not have chlorine - you have chloride.
Huh never knew this thanks for the clarification as well!
2. (Original post by ozmo19)
1. 3.12 g of MCl2 were dissolved in water and made up to one litre of solution. 25.0 cm3 of thissolution reacts with 7.5cm3 of 0.100M silver nitrate solution.
Which group 2 element is M?

The answer is Barium and i not sure how to find that?
3. (Original post by NNB_Herath)
if you get 56 RAM ...then it is Barium only because RAM stands for RELATIVE ATOMIC MASS (not molecular)

But i got the RMM as 28 so my RAM is 12 so it is MAGNESIUM
Huh?
4. (Original post by ozmo19)
1. 3.12 g of MCl2 were dissolved in water and made up to one litre of solution. 25.0 cm3 of thissolution reacts with 7.5cm3 of 0.100M silver nitrate solution.
Which group 2 element is M?

The answer is Barium and i not sure how to find that?
Mass of MCl2 = 3.12 x 25/1000 = 0.078

Mol of Ag ion = 0.1 x 0.0075 = 0.0075

Ratio of Ag to Cl ions is 1:2

Therefore mol of MgCl2 = 0.0075/2 = 0.000375 mol

RFM of MCl2 = 0.078/0.000375 = 208

M = 208 - (2 x 35.5) = 137

M = Ba
5. Can any body tell me why answer of this question is 7%?

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