HYDROGEN

In the laboratoryH₂O₂ is prepared by the action of

• cold dilute H₂SO₄ on hydrated BaO₂

• dil.HCl on MnO₂

• cold H₂SO₄ on MnO₂

• aqueous alkali on Na₂O₂

The bleaching properties of H₂O₂ are due to its

• reducing properties

• oxidising properties

• unstable nature

• acidic nature

Which of the following is not a water softener

• Na₂CO₃

• Na₂SO₄

• Calgon

• Permutit

What is False about ice-

• Its density is more than water

• A water molecule form 4 H-Bond

• It is a thermal insulator

• Its density is less than water

Amongst H₂O,H₂S,H₂Se and H₂Te, the one with the highest boiling point is -

• H₂O, because of hydrogen bonding

• H₂Te, because of higher molecular weight

• H₂S, because of hydrogen bonding

• H₂Se, because of lower molecular weight

Which of the following process will produce hardwater ?

• Saturation of water with CaCO₃

• Saturation of water with MgCO₃

• Saturation of water with CaSO₄

• Addition of Na₂CO water

In context with the industrial preparation of hydrogen from water gas (CO+H₂),which of the following

is the correct statement ?

• CO is removed by absorption in aqueous Cu₂Cl₂ solution

• H₂ is removed through occlusion with Pd

• CO is oxidized to CO₂ with steam in the presence of a catalyst followed by absorption of CO₂ in alkali

• CO and H₂ are fractionally separated using differences in their densities

Statement–1 :D₂ molecules is more stable than H₂.

Statement–2 :The bond dissociation energy of D₂ is more than of H₂.

• Statement-1 is true, statement-2 is true and statement-2 is correct explanation for statement-1.

• Statement-1 is true, statement-2 is true and statement-2 is NOT the correct explanation for statement-1.

• Statement-1 is true, statement-2 is false.

• Statement-1 is false, statement-2 is true

Statement–1 : ZrH₂ is a non-stoichiometric hydride.

Statement–2 :The composition of ZrH₂ is exact same as its chemical formula.

• Statement-1 is true, statement-2 is true and statement-2 is correct explanation for statement-1.

• Statement-1 is true, statement-2 is true and statement-2 is NOT the correct explanation for statement-1.

• Statement-1 is true, statement-2 is false.

• Statement-1 is false, statement-2 is true

Hydrogen can be obtained from water, by the action of water on-

• Calcium carbide

• Calcium hydride

• Calcium oxide

• Calcium chloride