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S Block > Alkali metal > Flashcards

Alkali metal Flashcards

1
Q

atomic radius down the group (group 1)

A

increases

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2
Q

density down the group (group 1)

A

increases

exception - Na > K

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3
Q

flame color of Li (group 1)

A

chrimson red

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4
Q

flame color of Na (group 1)

A

yellow

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5
Q

flame color of K (group 1)

A

violet

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6
Q

flame color of Rb (group 1)

A

red-violet

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7
Q

flame color of Cs (group 1)

A

blue

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8
Q

electronegativity down the group (group 1)

A

decreases

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9
Q

electron affinity down the group (group 1)

A

decreases

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10
Q

metallic bond strength down the group (group 1)

A

decreases

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11
Q

in s block, minimum S.R.P. is of (group 1)

A

lithium

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12
Q

in s block, maximum S.R.P. is of (group 1)

A

sodium

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13
Q

hydration energy is proportional to (group 1)

A

charged density

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14
Q

which of the elements can be used as electrodes in photoelectric cell (group 1)

A

Cs and K

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15
Q

why are alkali metals very reactive (group 1)

A

because of low I.E. , they tend to form ionic bond faster by fajan’s rule

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16
Q

general element formed on reaction in air (group 1)

A

N2: Lithium nitride only
O2: OXIDE, PEROXIDE AND SUPEROXIDE

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17
Q

forms normal oxide on reaction with O2 (group 1)

A

Li

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18
Q

forms peroxide on reaction with O2 (group 1)

A

Na

19
Q

forms superoxide on reaction with O2 (group 1)

A

K, Rb, Cs

20
Q

which have highest hydration energy (group 1)

A

Li

21
Q

Li shows diagonal relationship with (group 1)

A

Mg

22
Q

general compound on reaction with H2 (group 1)

A

MH

ionic salt like hydride

23
Q

general compound on reaction with halogen (group 1)

A

MX

it forms ionic compound but lithium halides are somewhat covalent due to fajan’s rule

24
Q

reactivity with H2O down the group (group 1)

A

decreases

25
Q

reducing nature down the group (group 1)

A

increases

exception - lithium has maximum

26
Q

reacts least rapidly with H2O (group 1)

A

Li

Due to High MP

27
Q

MP and BP down the Group (group 1)

A

Decreases

28
Q

liq NH3+ alkali metal (group 1)

A

Blue colour solution
paramagnetic
both of this is due to ammoniated electrons

29
Q

why do the solution become bronze in colour on standing (group 1)

A

blue colour disappears as the electrons forms amide

solution losses its e- thus it also looses the paramagnetic property of the solution and become diamagnetic

30
Q

Al + Li is used in (group 1)

A

Aircraft

31
Q

Li + Mg is used for (group 1)

A

Armour

32
Q

white metals are (group 1)

A

alloys of Li

33
Q

White metals are used in (group 1)

A

ball bearings for motor engines

34
Q

Na + Pb alloy is used in

A

anti knock additives in petrol

35
Q

what act as an liquid coolent in fast breeding nuclear reactor (group 1)

A

Liq Na

36
Q

absorbs CO2 (group 1)

A

KOH

37
Q

used in soaps (group 1)

A

KOH, NaOH

potassium soaps are softer for skin than the sodium soaps.

38
Q

Lithium shows anomalous behavior because (Group 1)

A
  1. small size

2. high polarizing power

39
Q

The bicarbonate salts (Group 1)

A

solid except LiHCO3

40
Q

M2CO3 on heating (Group 1)

A

Li : Li2O +CO2

Na, K , Rb , Cs : no reaction

41
Q

LiNO3 heat (Group 1)

A

Li2O + NO2

42
Q

NaNO3 500 C (Group 1)

A

NaNO2 +O2

43
Q

NaNO3 800 C (Group 1)

A

NaNO2 + N2 +O2

S Block (2 decks)

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