221.

Beryllium and aluminium exhibit many properties which are similar. But the two elements differ in

• exhibiting maximum covalency in compound

• exhibiting amphoteric nature in their oxides

• forming covalent halides

• forming covalent halides

Aluminium chloride exists as a dimer, Al₂Cl₆ in the solid state as well as in solution of non-polar solvents such as benzene. When dissolved in water, it gives

• Al³⁺ + 3Cl^-

• Al₂O₃ + 6HCl

• [Al(OH)₆] ^3-

• [Al(OH)₆] ^3-

Nitrogen dioxide is not produced on heating

• KNO₃

• Pb(NO₃)₂

• Cu(NO₃)₂

• AgNO₃

In the solid state, PCl₅ exists as

• [PCl₄]^- and [PCl₆]⁺ ions

• covalent PCl₅ molecules only

• [PCl₄]⁺ and [PCl₆]^-

• covalent P₂Cl₁₀ molecules only

The acid in which O-O bonding is present is

• H₂S₂O₃

• H₂S₂O₆

• H₂S₂O₈

• H₂S₄O₆

If radium and chlorine combine to form radium chloride, the compound would be

• half as radioactive as radium

• twice as radioactive

• as radioactive as radium

• not radioactive

Which of the following arrangements is correct in respect of solubility in water?

• CaSO₄ > BaSO₄ > BeSO₄ > MgSO₄ > SrSO₄

• BeSO₄ > MgSO₄, > CaSO_4, > SrSO_4, > BaSO₄

• BaSO₄> SrSO₄ > CaSO₄ >MgSO₄ > BeSO₄

• BeSO₄ > CaSO₄, > MgSO₄ >SrSO₄ > BaSO₄

The order of equivalent conductances at infinite dilution for LiCl, NaCl and KCl is

• LiCl > NaCl > KCl

• KCl > NaCl > LiCl

• NaCl > KCl > LiCl

• LiCl > KCl > NaCl

Compound X is tested and the results are shown in the table.

Test	Result
Aqueous sodium hydroxide is added, then heated gently.	Gas given off which turns damp red litmus paper blue
Dilute hydrochloric acid is added.	Effervescence, gas given off which turns lime water milky and acidified K2Cr2O7, paper green.

Which ions are present in compound X?

• Ammonium ions and sulphite ions

• Ammonium ions and carbonate ions

• Sodium ions and carbonate ions

• Ammonium ions and sulphate ions

Sulphuryl chloride (SO₂Cl₂) reacts with white phosphorus (P₄) to give

• PCl₅, SO₂

• OPCl₃, SOCl₂

• PCl₅, SO₂, S₂Cl₂

• OPCl₃, SO₂, S₂Cl₂