Single Choice

The conversion of atomic hydrogen into ordinary hydrogen is

AExothermic change
Correct Answer
BEndothermic change
CNuclear change
DPhotochemical change

Solution

The conversion of atomic hydrogen into ordinary hydrogen is an exothermic reaction. Since atomic hydrogen is very unstable it readily combines with another hydrogen atom to form hydrogen molecule which is highly stable hence energy is released.

$$2H\to H_2;$$ $$\Delta H=-ve$$

SIMILAR QUESTIONS

Study of the First Element - Hydrogen

Tritium emits:

Study of the First Element - Hydrogen

$${ H }^{ + }$$,$${ D }^{ + }$$ and $${ T }^{ + }$$ differ in all except in:

Study of the First Element - Hydrogen

Which property among the following is same for both hydrogen and deuterium molecules?

Study of the First Element - Hydrogen

The isotopes of hydrogen are :

Study of the First Element - Hydrogen

Which of the following statements about hydrogen is incorrect?

Study of the First Element - Hydrogen

Write the names of isotopes of hydrogen. What is the mass ratio of these isotopes?

Study of the First Element - Hydrogen

Name the isotopes of hydrogen.

Study of the First Element - Hydrogen

Which is not true for $$_{1}{H}^{1}$$; $$_{1}{H}^{2}$$; $$_{1}{H}^{3}$$?

Study of the First Element - Hydrogen

The nuclei of tritium $$({ H }^{ 3 })$$ atom would contain neutrons equal to:

Study of the First Element - Hydrogen

The most abundant isotope of hydrogen is:

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