Previous Year Papers

Download Solved Question Papers Free for Offline Practice and view Solutions Online.

Test Series

Take Zigya Full and Sectional Test Series. Time it out for real assessment and get your results instantly.

Test Yourself

Practice and master your preparation for a specific topic or chapter. Check you scores at the end of the test.

Hydrogen

Short Answer Type

101. Arrange the following:
LiH, NaH and CsH in order of increasing ionic character.

1283 Views

102. Arrange the following:
H–H, D–D and F–F in order of increasing bond dissociation enthalpy.

859 Views

103. Arrange the following:

NaH, MgH₂ and H₂O in order of increasing reducing property.

1268 Views

Long Answer Type

104.

Describe the industrial uses of hydrogen which depend on:
(i) the heat liberated when it burns,
(ii) its ability to react with vegetable oil in the presence of catalyst,
(iii) its ability to unite with nitrogen.

223 Views

Short Answer Type

105. How does the atomic hydrogen or oxy-hydrogen torch function for cutting and welding purposes? Explain.

Atomic hydrogen is formed by passing dihydrogen gas through electric are struck between two hydrogen two tungsten electrodes, when dihydrogen molecules dissociate into H-atoms.

The life period of atomic hydrogen is 0.3 sec. Consequently, it returns to molecular form (H₂) liberating a tremendous amount of energy which is used for cutting and welding purposes in the form of atomic hydrogen.