Brainscape's Knowledge GenomeTM


Top Flashcards (Certified)
All Flashcards

Chemistry > XI: Hydrogen > Flashcards

XI: Hydrogen Flashcards

1
Q

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

A

Cathode

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

CuO + H2———>

A

Cu + H2O

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

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

A

Hexahydrated ions

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

WHat is the atomicity of hydrogen?

A

2

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

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

A

Anode

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Which element is known as rogue element?

A

Hydrogen

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

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

A

Yes

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

WHich has higher melting point- dihydrogen, deuterium?

A

Deuterium

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

WHich has higher boiling point- dihydrogen, deuterium?

A

Deuterium

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Which has higher enthalpy of fusion- dihydrogen or deuterium?

A

Deuterium

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

Which has higher bond enthalpy- dihydrogen or deuterium?

A

Deuterium

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

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

A

Hydron

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
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

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Lane’s process is used for the manufacturing of

A

Dihydrogen

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

How is dihydrogen produced by lane’s process?

A

By reaction of water with iron

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
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)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

What is the order of reactivity of hydrogen with halogen?

A

F2 > Cl2 > Br2 >I2

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
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

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

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

A

Ortho

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

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

A

Para

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

Can pure ortho form of hydrogen be obtained?

A

No

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

Can pure para form of hydrogen be obtained?

A

Yes, at low temperatures

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
23
Q

What are hydrides?

A

Binary compounds of hydrogen with other elements

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
24
Q

What are saline hydrides?

A

Ionic hydrides (with alkali metals and alkaline earth metals)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
25
Do saline hydrides have higher density than the metals they are formed from?
Yes
26
SiCl4 + NaH -------------->
SiH4 + NaCl
27
PbSO4 + CaH2 ------------------>
PbS + Ca(OH)2
28
What is known as hydride gap?
The inability of group 7, 8 and 9 to form hydrides.
29
Is CrH an interstitial hydride?
Yes
30
Polymeric hydrides are formed by elements having electronegativity range between
1.4 to 2.0
31
What crystalline structure does ice have at low temperature?
Cubic form
32
Water decomposes easily, true/false?
False.
33
How is water present in BaCl2.2H2O?
Water is present in voids of crystal lattice
34
How do physical properties of heavy water differ from ordinary wateR?
All physical properties of heavy water are higher than ordinary water.
35
Ca3P2 + D2O ------->
Ca(OD)2 + PD3
36
NaOH + D2O -------->
NaOD + HDO
37
What is carbonate hardness of water?
It is due to the presence of soluble bicarbonates of calcium and magnesium. It is also known as temporary hardness.
38
How can temporary hardness of water be removed?
By boiling
39
What causes permanent hardness of water?
Presence of chlorides and sulphates calcium and magnesium
40
By boiling, bicarbonates of calcium and magnesium present in the water decompose into
Insoluble carbonates
41
M(HCO3)2 on heating gives
MCO3 + H2O + CO2
42
Clark's method is used to soften
Temporary hardness of water
43
Which compound is used to soften hard water using Clark's process?
Calcium hydroxide
44
What compound is known as calgon?
Sodium polymetaphosphate [(NaPO3)n]
45
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?
THis is because the calcium and magnesium ions are not free to react with soap but are tied up in stable complexes.
46
What is sequestration of calcium?
The process of binding or confining calcium ions such that they are separated from other components of the system.
47
What is Permutit exchange method of softening of water?
Addition of complex inorganic salts which exchange calcium and magnesium ions in hard water for sodium ions.
48
Give the example of a permutit?
Hydrated sodium aluminium silicate
49
Which cation do organic ion exchanger exchange with calcium or magnesium of hard water?
Hydrogen ion
50
Which anion do organic ion exchanger exchange with calcium or magnesium of hard water?
OH- or NH2-
51
Na2O2 + H2SO4 -------->
Na2SO4 + H2O2
52
BaO2.8H2O + H2SO4-------------->
H2O2 + H2O + BaSO4
53
What is formed by the electrolysis of 50% H2SO4 at anode? What does the distillation of this compound with water under reduced pressure give?
Peroxydisulfuric acid H2S2O8 Is formed at anode. On distillation with water it gives hydrogen peroxide.
54
2-Ethylanthraquinol when dissolved in a mixture of benzene and cyclohexanol and bubbled with air gives
Hydrogen peroxide
55
Why is a small amount of glycerol added to hydrogen peroxide?
To stabilise it
56
What is the dihedral angle of hydrogen peroxide in vapour phase vs in solid phase?
Vapour phase- 115 degree | Solid phase- 90.2 degree
57
Is hydrogen peroxide acidic or basic?
Acidic
58
Hydrogen peroxide can oxidize benzene to
Phenol
59
Hydrogen peroxide oxidizes iodide to IO3- | True/false?
False. Hydrogen peroxide oxidizes iodide to iodine.
60
Hydrogen peroxide reduces potassium dichromate to
CrO5 which decomposes in acidic medium to form Cr3+
61
NaOBr + H2O2 --------------->
NaBr + H2O + O2
62
CaOCl2 + H2O2 --------->
CaCl2 + H2O + O2
63
Which compound on treatment with acidified solution of Titanium salt gives orange colour ? What compound is formed?
Hydrogen peroxide | H2TiO4
64
What does 10 volume hydrogen peroxide imply?
One litre of H2O2 will produce 10 L of oxygen

Chemistry (4 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2025 Bold Learning Solutions. Terms and Conditions