Atomic hydrogen produces formaldehyde when it reacts with:

(1) CO2

(2) CO

(3) O2

(4) C2H2

Subtopic:  Hydrogen- Types & Isotopes |
 59%
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The percentage of a para-hydrogen in ordinary hydrogen increases when:

1. temperature is lowered 

2. temperature is increased

3. pressure is increased and temperature decreased

4. none of these

Subtopic:  Hydrogen- Types & Isotopes |
 58%
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Para- hydrogen at room temp is:

1. less stable than ortho- hydrogen

2. more stable than ortho- hydrogen

3. as stable as ortho- hydrogen

4. none of these

Subtopic:  Hydrogen- Types & Isotopes |
 61%
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The hydrogen at the moment of it's formation is called:

1. Atomic

2. Ortho

3. Para

4. Nascent

Subtopic:  Hydrogen- Types & Isotopes |
 66%
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Which one is used as propellants for rockets?

1. Liq.H2+Liq.O2

2. Liq.N2+Liq.O2

3. Liq.H2+Liq.N2

4. Liq.O2+Liq.Air

Subtopic:  Preparation & Properties |
 57%
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Reaction among the following where H2O2 acts as a reducing agent is-

a. H2O2+2H++2e-2H2O

b. H2O2-2e-O2+2H+

c. H2O2+2e-2OH-

d. H2O2+2OH--2e-O2+2H2O

1. a, b

2. c, d

3. a, c

4. b, d

Subtopic:  H2O2 (Hydrogen Peroxide) |
 62%
From NCERT
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Hydrogen peroxide in its reaction with KIO4 and NH2OH respectively is acting as a 

1. reducing agent, oxidising agent

2. reducing agent, reducing agent

3. oxidising agent, oxidising agent

4. oxidising agent, reducing agent

Subtopic:  H2O2 (Hydrogen Peroxide) |
 60%
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The acidified solution of FeCl3 is reduced by passing:

(1) ordinary H2

(2) O2

(3) nascent H

(4) H2

Subtopic:  Preparation & Properties |
 69%
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Nascent hydrogen consists of :

(1) hydrogen atoms with excess energy

(2) hydrogen molecules with excess energy

(3) hydrogen ions in an excited state

(4) solvated protons

Subtopic:  Preparation & Properties |
 74%
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The conversion of atomic hydrogen into ordinary hydrogen is:

1. exothermic change

2. endothermic change

3. nuclear change

4. photochemical change

Subtopic:  Hydrogen- Types & Isotopes |
 72%
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