Chemistry help. Explain (very briefly) if possible. Thanks guys! Which reagent c

Question

Chemistry help.

Explain (very briefly) if possible. Thanks guys!

Which reagent can be used to precipitate Group II cations? a. CH3CSNH2 b. NH3 c. CH3COOH d. (COOH)2 After dissolving a brown residue in 6M HCI, followed by addition of 0.1M KSCN. A solution with deep red color was obtained. Which is the possible group -Ill cation present in the brown residue? a.Sn4+ b.Fe3+ c.Ni2+ d.Cr3+ Is the following statement true or false? A standard Na011 solution can be prepared by dissolving an accurate amount of Na011 pellets into a known volume of aqueous solution. a. true b. false The reaction of thioacetamide (CH3CSNH2) with Cd2 at pH ?0.5 forms a a. Chloride b. Sulfide c. Sulfate d. None of the above Under what condition Group II cations can be separated from Group III by S2-? a. pH = 0.5 b. pH 10 c. others

Explanation / Answer

1. Sulphide ions precipitate group II cations.

Answer : A

2. Fe(SCN)3 is formed

Answer : B

3. Standard solution is a chemical term which describes a solution of known concentration.

Answer : True

4. pH < 5

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