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At absolute zero-...

At absolute zero-

A

only para-hydrogen exists

B

only ortho-hydrogen exists

C

both ortho-and para-hydrogen exist.

D

neither para-nor ortho-hydrogen exists

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The correct Answer is:
A
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Knowledge Check

  • This question has Statement I and Statement II. Of the four choices given after the Statements, choose the one that best describes the two Statements. Statement-I : Enthalpy and entropy of any elementary substance in the standard states are taken as zero. Statement-II : At absolute zero, particles of the perfectly crystalline substance become completely motionless.

    A
    Statement-I is true, Statement-II is true, Statement-II is a correct explanation of Statement-I
    B
    Statement-I is true, Statement-II is true, Statement-II is not a correct explanation of Statement-I
    C
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    D
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    • CHHAYA PUBLICATION-HYDROGEN-MCQ HOTSPOT (SINGLE CORRECT TYPE )
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    2. In which of the following reaction dihydrogen acts as an oxidising age...

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    3. Which of the following halogens has least affinity towards hydrogen-

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    4. Which of the following compounds on electrolysis produces hydrogen-

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    5. Thermal stability of Gr.-15 hydrides follows the order-

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    6. The correct order of vaporisation enthalpy of the following hydride is...

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    7. Interstitial hydrides are formed by-

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    8. The correct descending order of thermal stability of alkali metals hyd...

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    9. Solubility of NaCl in the solvents H(2)O and D(2)O is -

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    10. Degree of hardness of 1L sample water containing 0.002 mol "MgSO"(4) i...

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    11. Which of the following reacts with water to produce electron-precise h...

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    12. Which of following couples reacts with water to produce same gaseouse ...

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    13. Which of the following compounds contain free hydrogen-

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    14. Which of the followings reacts with metallic sodium to produce hydroge...

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    15. Semi-water gas is-

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    16. Which of the following metals does not react with cold water but liber...

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    17. Volume of '10 volume' H(2)O(2) required to convert 0.01 mol PbS into "...

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    18. On dilution of H(2)O(2) the value of dielectric constant-

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    19. By which of the following water gets oxidised to oxygen-

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    20. Which of the following does not get oxidised by H(2)O(2) -

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