Hydrogen Test - 1

Following reaction takes place in this case:

Na₂O₂ + 2HCl →H₂O₂ + 2NaCl

H₂O₂ acts as a reducing agent and an oxidising agent when it is added to a solution of KMnO₄ and a solution of KI, respectively.

As a reducing agent:

2KMnO₄ + 5H₂O₂ + 3H₂SO₄ ^→ K₂SO₄ + 5O₂ + 2MnSO₄ + 8H₂O

As an oxidising agent:

3KI + H₂O₂ + H₂SO₄ ^→ KI₃ + K₂SO₄ + 2H₂O

It is usually prepared by the reaction of granulated zinc with dilute sulphuric acid.

Zn + H₂SO₄ => ZnSO₄ + H₂

Bosch reaction is a chemical reaction between carbon dioxide and hydrogen that produces elemental carbon (graphite), water and a 10% return of invested heat.
The following reaction takes place:
CO2 (g) + 2H₂ (g) →C (s) + 2H₂O (g)

Fluorine ion by a process of hydrogen bonding forms the anion [HF₂]^-. Hence, in the presence of an alkali like KOH, HF forms salt-like compounds like KHF₂.

Magnesium chloride cannot be used for water softening as it results in water hardening.

CaCl₂ + (NaPO₃)n → Na_{n - 2}Ca(PO₃)_n + 2NaCl

M_g3N₂ + 6D₂O → 3Mg(OD)₂ + 2ND₃

Ionisation energy of hydrogen is very high. It is comparable to that of halogens.

The option (4) is incorrect because heavy water is not safe to drink.Drinking just a few milliliters or anything up to a regular glass of water might not actually have any noticeable effects. However, any amount larger than that would cause dizziness probably because heavy water has a greater density than regular water and can affect the fluid in the inner ear which is essential for keeping the balance.

Nascent hydrogen has one unpaired electron in its valence shell. So, it is very reactive and undergoes several reactions to make a variety of compounds.