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Inorganic chemistry > S-Block > Flashcards

S-Block Flashcards

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1
Q

Ions found in biological fluids

A

Na, K, Mg, Ca

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2
Q

Order of density of alkali metals

A

Li<K<Na<Rb<Cs [Density]

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3
Q

what colour does Li shows to an oxidizing flame

A

Crimson red

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4
Q

what colour does Na shows to an oxidizing flame

A

yellow

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5
Q

what colour does K shows to an oxidizing flame

A

Violet

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6
Q

what colour does Rb shows to an oxidizing flame

A

Red violet

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7
Q

what colour does Cs shows to an oxidizing flame

A

Blue

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8
Q

Li + O2 mainly forms

A

Li2O (oxide)

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9
Q

Na+O2 mainly form

A

Na2O2 (peroxide)

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10
Q

M(K/Rb/Cs) + O2 mainly forms

A

MO2 (superoxide)

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11
Q

Which metals react with Nitrogen from air to form MN3 (nitride)

A

LiN3

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12
Q

Which metal is covered with Paraffin wax instead of keeping it submerged in kerosene to prevent oxidation

A

Li

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13
Q

Alkali metals(M) reacts with water to form

A

MOH + H2(g)

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14
Q

Does Li reacts with C2H2

A

no

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15
Q

Does Na reacts with C2H2

A

yes

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16
Q

Li reacts with ammonia to form

A

Li2NH(Lmide) + dihydrogen gas

17
Q

are alkali metal hydrides are ionic compound

A

yes

18
Q

are alkali metal hallides are ionic

A

yes

19
Q

Among Hallides, which Li hallide is the most covalent in nature

A

LiI

20
Q

Order of Reducing power of alkali powers

A

Na<K<Rb<Cs<Li

21
Q

What happens when alkali metals are dissolved in water for a long period of time.What colour did it change and is it dimagnetic or paramagnetic

A

Deep blue colour to Bronze colour, Dimagnetic

22
Q

why does it gives deep blue colour when alkali metals are dissolved in liquid ammonia

A

Ans – Ammoniated electron
it form ammoniated cation and anion, and ammoniated electron is responsible for this colour change

23
Q

Li2O + water –> ?

A

LiOH

24
Q

Na2O2 + water –> ?

A

NaOH + H2O2

25
Q

K/Rb/CsO2 + water –> ?

A

K/Rb/csOH + H2O2 + O2

26
Q

Colour of pure oxides and peroxies

A

Colourless

27
Q

Colour of superoxides and is it paramagnetic or diamagnetic

A

yellow/ orange, paramagnetic

28
Q

hydroxides obtained from oxide + H20 are in which colour and is it amorphous or crystalline

A

white crystalline

29
Q

Alkali metals halids can be prepared by the reaction of?

A

alkali hydroxides, oxides / carbonate with Hydrohaulic acids

30
Q

Low solubility of Lif in water is due to

A

High latice energy

31
Q

Low solubility of CsI in water is due to

A

low hydration energy

32
Q

MCl is soluble in pyridine, what is M

A

Li

33
Q

which hydrocarbonate doesnt exist in solid, but does in aq soln

A

Li bicarbonate

34
Q
A

Inorganic chemistry (2 decks)

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