Which of the following statements is/are correct?
Which of the following statements is/are correct?
The correct options are
A Atomic hydrogen is obtained by passing hydrogen through an electric arc
B Nascent hydrogen is more reactive than the dihydrogen
C Pure para hydrogen is produced but not pure ortho hydrogen.
1. Atomic hydrogen is obtained by passing dihydrogen gas at atmospheric pressure through an electric arc struck between two tungsten rods. These atomic hydrogens are extremely reactive. Hence it is a correct statement.
2. Nascent hydrogen is also known as newly born hydrogen since it formed in-situ of the reaction and it is in the form of individual atoms hence it is more reactive than dihydrogen.
3. Para hydrogen is more stable than ortho hydrogen. Hence it is possible to get pure para hydrogen by cooling ordinary hydrogen to nearly 20 K. But it is never possible to get sample of more than 75% of ortho hydrogen. Hence this is a coorect statement.
4. In ordinary dihydrogen, both ortho and para hydrogen will be in equilibrium.
Ortho~hydrogen ⇌ Para~hydrogen
Hence option (a), (b) and (c) are correct statements.
Summary:
Uses of Dihydrogen:
1. Reducing agent
2. As a rocket fuel in liq. H2 form
3. Preparation of many compounds like urea, NH3
4. Oxy/atomic hydrogen torch for welding.
5. Hydrogenation of vegetable oils
6. In the manufacture of synthetic petrol
Different forms of hydrogen:
1. Atomic hydrogen
2.. Nascent hydrogen
3. Hydrides:
Types of hydrides:
3a. Saline/ionic
3b. Metallic/interstitial
3c. Molecular / Covalent
4. Ortho & para hydrogen
Atomic Hydrogen:
It is obtained by the dissociation of hydrogen molecules. The Atomic hydrogen is stable only for a fraction of a second and is extremely reactive.
It is obtained by passing dihydrogen gas at atmospheric pressure through an electric arc struck between two tungsten rods.
Atomic hydrogen torch:
H2(g)electric arc−−−−−−→2H(g)
ΔH=435.9 kJmol−1
A Atomic hydrogen is obtained by passing hydrogen through an electric arc
B Nascent hydrogen is more reactive than the dihydrogen
C Pure para hydrogen is produced but not pure ortho hydrogen.
1. Atomic hydrogen is obtained by passing dihydrogen gas at atmospheric pressure through an electric arc struck between two tungsten rods. These atomic hydrogens are extremely reactive. Hence it is a correct statement.
2. Nascent hydrogen is also known as newly born hydrogen since it formed in-situ of the reaction and it is in the form of individual atoms hence it is more reactive than dihydrogen.
3. Para hydrogen is more stable than ortho hydrogen. Hence it is possible to get pure para hydrogen by cooling ordinary hydrogen to nearly 20 K. But it is never possible to get sample of more than 75% of ortho hydrogen. Hence this is a coorect statement.
4. In ordinary dihydrogen, both ortho and para hydrogen will be in equilibrium.
Ortho~hydrogen ⇌ Para~hydrogen
Hence option (a), (b) and (c) are correct statements.
Summary:
Uses of Dihydrogen:
1. Reducing agent
2. As a rocket fuel in liq. H2 form
3. Preparation of many compounds like urea, NH3
4. Oxy/atomic hydrogen torch for welding.
5. Hydrogenation of vegetable oils
6. In the manufacture of synthetic petrol
Different forms of hydrogen:
1. Atomic hydrogen
2.. Nascent hydrogen
3. Hydrides:
Types of hydrides:
3a. Saline/ionic
3b. Metallic/interstitial
3c. Molecular / Covalent
4. Ortho & para hydrogen
Atomic Hydrogen:
It is obtained by the dissociation of hydrogen molecules. The Atomic hydrogen is stable only for a fraction of a second and is extremely reactive.
It is obtained by passing dihydrogen gas at atmospheric pressure through an electric arc struck between two tungsten rods.
Atomic hydrogen torch:
H2(g)electric arc−−−−−−→2H(g)
ΔH=435.9 kJmol−1
