HYDROGEN JEE

Identify the incorrect statement regarding heavy water.

• It reacts with SO₃ to form deuterated sulphuric acid (D₂SO₄).

• It is used as a coolant in nuclear reactors.

• It reacts with CaC₂ to produce C₂D₂ and Ca(OD)₂.

• It reacts with Al₄C₃ to produce CD₄ and Al(OD)₃.

Determine the total number of neutrons in three isotopes of hydrogen

• 1

• 2

• 3

• 4

Hydrogen peroxide acts both as an oxidising and as a reducing agent depending upon the nature of the reacting species. In which of the following cases does H₂O₂ act as a reducing agent in acid medium?

• MnO₄^–

• SO₃^2-

• KI

• Cr₂O₇^2-

Hydrogen peroxide oxidises [Fe(CN)₆]^4- to [Fe(CN)₆]^3- in acidic medium but reduces

[Fe(CN)₆]^3- to [Fe(CN)₆]^4- in alkaline medium. The other products formed are, respectively :

• (H₂O + O₂ ) and (H₂O + OH^–)

• H₂O and (H₂O + O₂)

• H₂O and (H₂O + OH^– )

• (H₂O + O₂ ) and H₂O

Which of the following statements are correct?

(1) On decomposition of H₂O₂, O₂ gas is released.

(2) 2-ethylanthraquinol is used in the preparation of H₂O₂

(3) On heating KClO₃, Pb(NO₃)₂, NaNO₃, O₂ gas is released.

(4) In the preparation of sodium peroxoborate, H₂O₂ is treated with sodium metaborate.

• 1,2,4

• 2,3,4

• 1,2,3,4

• 1,2,3

The isotopes of hydrogen are

• protium, deuterium and tritium

• protium and deuterium only

• deuterium and tritium only

• tritium and protium only.

The synonym for water gas, when used in the production of methanol, is

• fuel gas

• natural gas

• laughing gas

• syn gas.

The chemical nature of hydrogen peroxide is

• oxidising and reducing agent in both acidic and basic medium

• oxidising agent in acidic medium, but not in basic medium

• oxidising and reducing agent in acidic medium, but not in basic medium

• reducing agent in basic medium, but not in acidic medium.

The correct statements among (A) to (D) regarding H₂ as a fuel are

• It produces less pollutants than petrol.

• A cylinder of compressed dihydrogen weighs ~30 times more than a petrol tank producing the same amount of energy.

• Dihydrogen is stored in tanks of metal alloys like NaNi5.

• On combustion, values of energy released per gram of liquid dihydrogen and LPG are 50 and 142 kJ, respectively.

NaH is an example of

• metallic hydride

• saline hydride

• electron-rich hydride

• molecular hydride.