HYDROGEN

Non-stoichiometric hydrides are formed by -----

• Pa , V

• C , Ni

• Mn, Li

• N , Cl

The hardness of water can be determined by volumetrically using the reagent

• sodium thio sulphate

• EDTA

The cause of permanent hardness of water is due to

• MgCO3

• CaCl2

• Ca(HCO3)2

Zeolite used to soften hardness of water is, hydrated

• Zinc aluminium borate

• Sodium aluminium silicate

• Calcium aluminium silicate

• Lithium aluminium hydride

The hybridisation of oxygen atom is H₂ O and H₂O₂ are, respectively

• sp and sp³

• sp³ and sp³

• sp and sp²

• sp and sp

When hydrogen peroxide is shaken with an acidified solution of potassium dichromate

in presence of ether, the ethereal layer turns blue due to the formation of

• Cr₂O₃

• CrO(O₂)₂

• CrO₄ ^2–

In solid ice, oxygen atom is surrounded

• octahedrally by 2 oxygen and 4 hydrogen atoms

• tetrahedrally by 4 hydrogen atoms

• tetrahedrally by 2 hydrogen and 2 oxygen atoms

Ionic hydrides are formed by

• halogens

• chalogens

• group one elements

Heavy water is used as

• modulator in nuclear reactions

• coolant in nuclear reactions

• both (a) and (b)

Water is a

• basic oxide

• acidic oxide

• amphoteric oxide