Pick out the correct statement...

Pick out the correct statement

By decreasing the temperature pure para-hydrogen can be obtained

By increasing the temperature pure ortho-hydrogen can be obtained

By decreasing the temperature pure ortho-hydrogen can be obtained

By increasing the temperature pure para-hydrogen can be obtained

Text Solution

Verified by Experts

The correct Answer is:

Pure para form can be obtained at low temperature (20K) but pure ortho form is very difficult to obtain.

Knowledge Check

Pick out the incorrect statement

Nitrogen dioxide has odd number of electrons and its structure is linear and has N-O bonds of different lengths

`NO_2` in paramagnetic

`N_2O_4` has planar structure and all N-O bonds are equivalent and is also diamagnetic molecule containing an

`N_2O_4` ionizes slightly to form `NO^(+) and NO_(3)^(-)` ions.

Pick out the incorrect statement :

`MnO_4^(2-)` is quite strongly oxidizing and stable only in very strong alkalies. In dilute alkali, neutral solutions, it disproportionates.

In acidic solutions, `MnO_4^–` is reduced to `Mn^(2+)` and thus, `KMnO_4` is widely used as oxidising agent

`KMnO_4` does not acts as oxidising agent in alkaline medium

`KMnO_4` is manufactured by the fusion of pyrolusite ore with KOH in presence of air or `KNO_3`, followed by electrolytic oxidation in alkaline solution.

Pick out the incorrect statement:

`MnO_(4)^(2-)` is quite strongly oxidizing and stable only in very strong alkalies. In dilute alkali, neutral solutions, it disproportionates.

In acidic solutions, `MnO_(4)^(-)` is reduced to `Mn^(2+)` and thus, `KMnO_(4)` is widely used as oxidising agent

`KMnO_(4)` does not acts as oxidising agent in alkaline medium

`KMnO_(4)` is manufactured by the fusion of pyrolusite ore with KOH in presence of air or `KNO_(3)` , followed by electrolytic oxidation in acidic medium