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QA Flashcards

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1
Q

Colour of Iron II Oxide (FeO)

A

Black

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2
Q

Colour of Iron III Oxide (Fe2O3)

A

Reddish-Brown

(yellowish brown if lower conc.)

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3
Q

Colour of Copper II Oxide (CuO)

A

Black

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4
Q

Colour of Copper I Oxide (Cu2O)

A

Reddish-Brown

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5
Q

Colour of Copper II Cabonate (CuCO3)

A

Green

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6
Q

Usual colour of Copper II salts (eg, CuSO4, Cu(NO3)2, …)

A

Blue

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7
Q

Colour of Copper II Chloride (CuCl)

A

Bluish-green

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8
Q

Test for Fe2+ ions in aq NaOH?

A

Dirty green ppt, insoluble in excess aq NaOH

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9
Q

Test for Fe3+ ions in aq NaOH?

A

Reddish-brown ppt, insoluble in excess aq NaOH

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10
Q

Test for Fe3+ ions in aq ammonia (NH3)?

A

Reddish-brown ppt, insoluble in excess aq ammonia

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11
Q

Test for Fe2+ ions in aq ammonia (NH3)?

A

Dirty green ppt, insoluble in excess aq ammonia

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12
Q

Test for Cu2+ ions in aq NaOH?

A

Light blue ppt, insoluble in excess aq NaOH

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13
Q

Test for Cu2+ ions in aq ammonia?

A

Light blue ppt, soluble in excess aqueous ammonia giving dark blue solution

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14
Q

Test for Al3+ ions in aq NaOH?

A

White ppt, soluble in excess aq NaOH giving colourless solution

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15
Q

Test for Al3+ ions in aq ammonia?

A

White ppt, insoluble in excess aq ammonia

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16
Q

Test for Ca2+ ions in aq NaOH?

A

White ppt, insoluble in excess aq NaOH

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17
Q

Test for Ca2+ ions in aq ammonia?

A

No ppt

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18
Q

Test for Pb2+ ions in aq NaOH?

A

White ppt, soluble in excess aq NaOH giving colourless solution

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19
Q

Test for Pb2+ ions in aq ammonia?

A

White ppt, insoluble in excess aq NaOH

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20
Q

Test for Zn2+ ions in aq NaOH?

A

White ppt, soluble in excess giving colourless solution

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21
Q

Test for Zn2+ ions in aq ammonia?

A

White ppt, soluble in excess giving colourless solution

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22
Q

Test for K+ / Na+ ions in aq NaOH / NH3?

A

No ppt

23
Q

Test for ammonium ion in aq NaOH?

A

Ammonia produced on warming

24
Q

Test for ammonium ion in aq ammonia?

A

-

25
Q

Test for sulfate ion?

A

Acidify the solution with dilute nitric acid, then add aqueous barium nitrate. White ppt formed.

26
Q

Test for chloride ion?

A

Acidify the solution with dilute nitric acid, then add aqueous silver nitrate. White ppt form.

27
Q

Test for iodide ion?

A

Acidify the solution with dilute nitric acid, then add aqueous silver nitrate. Yellow ppt form.

28
Q

Test for nitrate ion?

A

Add aqueous sodium hydroxide (NaOH) to the metal nitrate, then add aluminium foil/powder. Warm the mixture. Ammonia produced.

29
Q

Explain the principle of test for nitrate ion?

A

Nitrate ions are reduced by aluminium [reduction property of metals] in the presence of aqueous sodium hydroxide to form ammonia gas.

30
Q

Test for carbonate ion? CO3 2-

A

React with any dilute acid. Effervescence produced and is found to be carbon dioxide.

31
Q

Test for carbon dioxide gas

A

Bubble gas into limewater. White ppt produced. When excess CO2, ppt dissolves.

CO2 + Ca(OH)2 —–> CaCO3 + H2O

in excess CO2:
CaCO3 + H2O + CO2 —–> Ca(HCO3)2

32
Q

Test for ammonia gas

A

Damp red litmus paper turns blue

33
Q

Test for chlorine gas

A

Bleaches damp litmus paper

34
Q

Test for sulfur dioxide

A

Acidified potassium manganate (VII) (aq) turns from purple to colourless.

Sulfur dioxide is reducing agent, KMnO7 is oxidising agent. Manganese VII (Mn7+) reduced to Manganese II (Mn2+)

35
Q

Test for hydrogen

A

Lighted splint / burning splint. Flame is extinguished with a loud “pop” sound.

36
Q

Test for oxygen

A

Glowing splint. Flame is rekindled with placed near mouth of the test tube.

37
Q

Is Calcium Hydroxide Ca(OH)2 soluble in water?

A

Slightly

38
Q

Is Zinc Hydroxide Zn(OH)2 soluble in water?

A

No

39
Q

Is Iron II & Iron III Oxide soluble in water?

A

No

40
Q

Is Copper II Oxide soluble in water?

A

No

41
Q

Action of heat on substances

A
  1. Elements react w O2
  2. Compounds react w O2
  3. Metal carbonates decompose to form metal oxide and carbon dioxide (except group 1 carbonates)
42
Q

Colour of solid carbon

A

Black

43
Q

Colour of fluorine

A

Pale yellow gas at rtp

44
Q

Colour of chlorine

A

Greenish-yellow gas at rtp

45
Q

Colour of bromine

A

Reddish-brown liquid at rtp
Solid & Gas are also reddish-brown

46
Q

Colour of iodine

A

Black solid at rtp
Violet vapour
Reddish-brown / yellowish-brown solution depending on concentration

47
Q

Colour of nitrogen dioxide

A

Reddish brown gas at rtp

48
Q

Colour of nitrogen monoxide

A

Colourless gas at rtp

49
Q

Colour of carbon monoxide

A

Colourless gas at rtp

50
Q

Potassium manganate (VII) solution colour change

A

Purple to colourless when reduced

Mn7+ to Mn2+

51
Q

Potassium dichromate (VI) solution colour change

A

Orange to green

Cr6+ to Cr3+

52
Q

Universal indicator colour change

A

Red (pH0) —> Green (pH7) —> Purple (pH 14)

53
Q

Methyl orange colour change

A

Orange at <pH4,
Yellow at >pH4

54
Q

Phenolphthalein

A

Pink at pH >9
Colourless at pH <9

Chemistry (5 decks)

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