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Take equal quantities of distilled water in five test tubes namely A, B, C, D and E. Dissolve chlorides of sodium, potassium, ammonium, calcium and magnesium in each test tube respectively. Pour a small quantity of soap solution into each test tube and shake the test tubes well.
Then in which of the following test tubes foam or leather is not produced

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Test tube A

Test tube B

Test tube C

Test tube D and E

answer is D.

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Detailed Solution

$MgC l_{2}$ and $CaC l_{2}$ do not give good leather with soap due to they cause hardness of water.

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