Detection of cations

We can use ................... to detect copper II cations in their solutions

• NaOH

• NaOH₂

• Na(OH)₂

• Cu(OH)₂

We can use ................... to detect Iron II cations in their solutions

• NaOH

• KOH

• NaOH or KOH

• Fe(OH)₂

When you use the flame test, the flame becomes ........... in presence of sodium cations

• green

• yellow

• white

• red

When you use the flame test, the flame becomes ........... in presence of lithium cations

• green

• lilac

• crimson

• yellow

When you use the flame test, the flame becomes ........... in presence of potassium cations

• green

• crimson

• red

• lilac

When you use the flame test, the flame becomes ........... in presence of calcium cations

• lilac

• yellow

• crimson

• red

When you use the flame test, the flame becomes ........... in presence of barium cations

• lilac

• red

• pale green

• brown

When you add drop by drop of sodium hydroxide solution on aluminum chloride solution .......................

• a white gelatinous precipitate is formed from aluminum hydroxide

• a white gelatinous precipitate is formed from aluminum hydroxide, then disappears according to the formation of sodium aluminate solution.

• a green precipitate is formed from aluminum hydroxide

• a red precipitate is formed from aluminum hydroxide

When you add drop by drop of sodium hydroxide solution on iron II chloride solution .......................

• a green solution is formed

• a dirty green precipitate is formed

• a green vapor is formed

• a dirty green solution is formed

When you add drop by drop of sodium hydroxide solution on Iron III chloride solution .......................

• a reddish brown ppt is formed

• a green ppt is formed

• white ppt is formed

• blue ppt is formed