Identification For Ions and Gases

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30 Terms

1
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What gas turns damp red litmus paper blue?

Ammonia (NH₃)

2
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What gas turns limewater milky?

Carbon dioxide (CO₂)

3
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What gas relights a glowing splint?

Oxygen (O₂)

4
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What gas gives a "pop" sound with a lighted splint?

Hydrogen (H₂)

5
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What gas bleaches damp litmus paper white?

Chlorine (Cl₂)

6
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How do you test for sulfur dioxide gas?

Turns acidified potassium manganate(VII) from purple to colorless.

7
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What gas smells like rotten eggs?

Hydrogen sulfide (H₂S)

8
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What gas forms dense white fumes with hydrogen chloride gas?

Ammonia (NH₃)

9
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What gas is colorless, odorless, and supports combustion?

Oxygen (O₂)

10
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What gas is produced when a carbonate reacts with an acid?

Carbon dioxide (CO₂)

11
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How do you test for ammonium ions (NH₄⁺)?
Add aqueous sodium hydroxide and warm; ammonia gas is produced (turns damp red litmus paper blue).
12
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What is the result when copper(II) ions (Cu²⁺) react with aqueous sodium hydroxide?
Light blue precipitate, insoluble in excess.
13
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What is the result when iron(II) ions (Fe²⁺) react with aqueous sodium hydroxide?
Green precipitate, insoluble in excess.
14
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What is the result when iron(III) ions (Fe³⁺) react with aqueous sodium hydroxide?
Reddish
15
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What is the result when zinc ions (Zn²⁺) react with aqueous sodium hydroxide?
White precipitate, soluble in excess to form a colorless solution.
16
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What is the result when calcium ions (Ca²⁺) react with aqueous sodium hydroxide?
White precipitate, insoluble in excess.
17
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What is the result when lead(II) ions (Pb²⁺) react with aqueous sodium hydroxide?
White precipitate, soluble in excess to form a colorless solution.
18
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How do you distinguish aluminium ions (Al³⁺) using sodium hydroxide?
White precipitate forms, soluble in excess to give a colorless solution.
19
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Which ion gives a white precipitate with aqueous ammonia that is insoluble in excess?
Calcium ions (Ca²⁺).
20
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What happens when copper(II) ions (Cu²⁺) react with aqueous ammonia?
Light blue precipitate forms, soluble in excess to give a deep blue solution.
21
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How do you test for carbonate ions (CO₃²⁻)?
Add dilute acid; effervescence occurs, carbon dioxide gas is produced (turns limewater milky).
22
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How do you test for chloride ions (Cl⁻)?
Add dilute nitric acid, then aqueous silver nitrate; white precipitate forms.
23
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How do you test for bromide ions (Br⁻)?
Add dilute nitric acid, then aqueous silver nitrate; cream precipitate forms.
24
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How do you test for iodide ions (I⁻)?

Add dilute nitric acid, then aqueous lead nitrate; yellow precipitate forms.

25
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How do you test for sulfate ions (SO₄²⁻)?
Add dilute nitric acid, then aqueous barium nitrate; white precipitate forms.
26
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How do you test for sulfite ions (SO₃²⁻)?
Add dilute acid and warm gently; sulfur dioxide gas is produced, turns acidified potassium manganate(VII) from purple to colorless.
27
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How do you test for nitrate ions (NO₃⁻)?
Add aqueous sodium hydroxide, then aluminum foil, and warm gently; ammonia gas produced (turns damp red litmus paper blue).
28
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What is the result when chloride ions react with aqueous silver nitrate?
White precipitate of silver chloride forms.
29
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What is the result when bromide ions react with aqueous silver nitrate?
Cream precipitate of silver bromide forms.
30
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What is the result when iodide ions react with aqueous silver nitrate?
Yellow precipitate of silver iodide forms.