Which of the following has highest hydration energy?

• MgCl₂

• CaCl₂

• BaCl₂

• SrCl₂

Addition of sodium thiosulphate solution to a solution of silver nitrate gives X as white precipitate, insoluble in water but soluble in excess thiosulphate solution to give Y. On boiling in water, Y gives Z. X, Y and Z respectively are

• Ag₂S₂O₃, Na₃[Ag(S₂O₃)₂], Ag₂S

• Ag₂SO₄, Na[Ag(S₂O₃)₂], Ag₂S₂

• Ag₂S₂O₃, Na₅[Ag(S₂O₃)₃], AgS

• Ag₂SO₃, Na₃[Ag(S₂O₃)₂], Ag₂O

The aqueous solution of which of the following salt will have the lowest pH ?

• NaClO₃

• NaClO

• NaClO₄

• NaClO₂

Assertion : Na₂SO₄ is soluble in water while BaSO₄ is not.

Reason : Lattice energy of BaSO₄ exceeds its hydration energy.

• If both Assertion and Reason are true and Reason is the correct explanation of Assertion.

• If both Assertion and Reason are true but Reason is not the correct explanation of Assertion.

• If Assertion is true but Reason is false.

• If Assertion is false but Reason is true.

Identify the correct order of solubility in aqueous medium.

• CuS > ZnS > Na₂S

• ZnS > Na₂S > CuS

• Na₂S > CuS > ZnS

• Na₂S > ZnS > CuS

which of the following represents the composition of carnallite mineral?

• K₂O.Al₂O₃.6SiO₂

• KNO₃

• K₂SO₄^.MgSO₄^.MgCl₂^.6H₂O

• KCl^.MgCl₂^.6H₂O

Of the following compounds, the most acidic is

• As₂O₃

• P₂O₅

• Sb₂O₃

• Bi₂O₃

448. 'Electron' is an alloy of

• Mg and Zn

• Fe and Mg

• Ni and Zn

• Al and Zn

Which one of the following processes is used for the manufacture of calcium?

• Reduction of CaO with carbon

• Reduction of CaO with hydrogen

• Electrolysis of a mixture of anhydrous CaCl₂ and KCl

• Electrolysis of molten Ca(OH)₂

Fe(OH)₃ can be separated from Al(OH)₃ by the addition of

• NaCl solution

• dil. HCl solution

• NaOH solution

• NH₄Cl and NH₄OH