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Chemistry > XI: Hydrogen > Flashcards

XI: Hydrogen Flashcards

1
Q

During electrolysis of water, on which electrode is hydrogen liberated?

A

Cathode

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2
Q

CuO + H2———>

A

Cu + H2O

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3
Q

In what form do alkali metals exist in their aqueous solution?

A

Hexahydrated ions

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4
Q

WHat is the atomicity of hydrogen?

A

2

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5
Q

During electrolysis of sodium hydride, on which electrode is hydrogen liberated?

A

Anode

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6
Q

Which element is known as rogue element?

A

Hydrogen

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7
Q

Is the rate of protium containing compounds faster than the rate of deuterium containing compounds

A

Yes

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8
Q

WHich has higher melting point- dihydrogen, deuterium?

A

Deuterium

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9
Q

WHich has higher boiling point- dihydrogen, deuterium?

A

Deuterium

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10
Q

Which has higher enthalpy of fusion- dihydrogen or deuterium?

A

Deuterium

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11
Q

Which has higher bond enthalpy- dihydrogen or deuterium?

A

Deuterium

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12
Q

What is the isotopic mixture of proton and deutron with respect to their natural abundance called

A

Hydron

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13
Q

Why is amalgam of reactive metals used to produce hydrogen from water in place of the metal itself?

A

Reaction of pure reactive metals is very vigorous, amalgam of such metals is used to slow down the reaction

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14
Q

Lane’s process is used for the manufacturing of

A

Dihydrogen

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15
Q

How is dihydrogen produced by lane’s process?

A

By reaction of water with iron

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16
Q

How is carbon dioxide separated from hydrogen in syngas in Bosch’s process?

A

CO2 can be dissolved in water and hydrogen can escape, or CO2 can be removed by scrubbing the mixture with sodium arsenite. (Water gas shift reaction)

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17
Q

What is the order of reactivity of hydrogen with halogen?

A

F2 > Cl2 > Br2 >I2

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18
Q

What is the difference between ortho and para hydrogen?

A

Ortho hydrogen- if spins of the 2 nucleus of hydrogen are in same direction
Para hydrogen- if spins of the 2 nucleus of hydrogen are in opposite direction

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19
Q

Which type of isomer (ortho or para) does ordinary hydrogen contain in greater quantities?

A

Ortho

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20
Q

At low temperature, which type of isomer (ortho or para) does hydrogen contain in greater quantities?

A

Para

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21
Q

Can pure ortho form of hydrogen be obtained?

A

No

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22
Q

Can pure para form of hydrogen be obtained?

A

Yes, at low temperatures

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23
Q

What are hydrides?

A

Binary compounds of hydrogen with other elements

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24
Q

What are saline hydrides?

A

Ionic hydrides (with alkali metals and alkaline earth metals)

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25
Q

Do saline hydrides have higher density than the metals they are formed from?

A

Yes

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26
Q

SiCl4 + NaH ————–>

A

SiH4 + NaCl

27
Q

PbSO4 + CaH2 ——————>

A

PbS + Ca(OH)2

28
Q

What is known as hydride gap?

A

The inability of group 7, 8 and 9 to form hydrides.

29
Q

Is CrH an interstitial hydride?

30
Q

Polymeric hydrides are formed by elements having electronegativity range between

A

1.4 to 2.0

31
Q

What crystalline structure does ice have at low temperature?

A

Cubic form

32
Q

Water decomposes easily, true/false?

33
Q

How is water present in BaCl2.2H2O?

A

Water is present in voids of crystal lattice

34
Q

How do physical properties of heavy water differ from ordinary wateR?

A

All physical properties of heavy water are higher than ordinary water.

35
Q

Ca3P2 + D2O ——->

A

Ca(OD)2 + PD3

36
Q

NaOH + D2O ——–>

A

NaOD + HDO

37
Q

What is carbonate hardness of water?

A

It is due to the presence of soluble bicarbonates of calcium and magnesium. It is also known as temporary hardness.

38
Q

How can temporary hardness of water be removed?

A

By boiling

39
Q

What causes permanent hardness of water?

A

Presence of chlorides and sulphates calcium and magnesium

40
Q

By boiling, bicarbonates of calcium and magnesium present in the water decompose into

A

Insoluble carbonates

41
Q

M(HCO3)2 on heating gives

A

MCO3 + H2O + CO2

42
Q

Clark’s method is used to soften

A

Temporary hardness of water

43
Q

Which compound is used to soften hard water using Clark’s process?

A

Calcium hydroxide

44
Q

What compound is known as calgon?

A

Sodium polymetaphosphate [(NaPO3)n]

45
Q

The complexes of calcium and magnesium formed by addition of calgon in hard water dissolve in water, however they do not hinder the formation of lather. Why?

A

THis is because the calcium and magnesium ions are not free to react with soap but are tied up in stable complexes.

46
Q

What is sequestration of calcium?

A

The process of binding or confining calcium ions such that they are separated from other components of the system.

47
Q

What is Permutit exchange method of softening of water?

A

Addition of complex inorganic salts which exchange calcium and magnesium ions in hard water for sodium ions.

48
Q

Give the example of a permutit?

A

Hydrated sodium aluminium silicate

49
Q

Which cation do organic ion exchanger exchange with calcium or magnesium of hard water?

A

Hydrogen ion

50
Q

Which anion do organic ion exchanger exchange with calcium or magnesium of hard water?

A

OH- or NH2-

51
Q

Na2O2 + H2SO4 ——–>

A

Na2SO4 + H2O2

52
Q

BaO2.8H2O + H2SO4————–>

A

H2O2 + H2O + BaSO4

53
Q

What is formed by the electrolysis of 50% H2SO4 at anode? What does the distillation of this compound with water under reduced pressure give?

A

Peroxydisulfuric acid H2S2O8 Is formed at anode. On distillation with water it gives hydrogen peroxide.

54
Q

2-Ethylanthraquinol when dissolved in a mixture of benzene and cyclohexanol and bubbled with air gives

A

Hydrogen peroxide

55
Q

Why is a small amount of glycerol added to hydrogen peroxide?

A

To stabilise it

56
Q

What is the dihedral angle of hydrogen peroxide in vapour phase vs in solid phase?

A

Vapour phase- 115 degree

Solid phase- 90.2 degree

57
Q

Is hydrogen peroxide acidic or basic?

58
Q

Hydrogen peroxide can oxidize benzene to

59
Q

Hydrogen peroxide oxidizes iodide to IO3-

True/false?

A

False. Hydrogen peroxide oxidizes iodide to iodine.

60
Q

Hydrogen peroxide reduces potassium dichromate to

A

CrO5 which decomposes in acidic medium to form Cr3+

61
Q

NaOBr + H2O2 —————>

A

NaBr + H2O + O2

62
Q

CaOCl2 + H2O2 ———>

A

CaCl2 + H2O + O2

63
Q

Which compound on treatment with acidified solution of Titanium salt gives orange colour ? What compound is formed?

A

Hydrogen peroxide

H2TiO4

64
Q

What does 10 volume hydrogen peroxide imply?

A

One litre of H2O2 will produce 10 L of oxygen

Chemistry (4 decks)

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