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

• Mg and Zn

• Fe and Mg

• Ni and Zn

• Al and Zn

244.

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

Select the incorrect statement among the following:

• O₃ is used as germicide for purification of air

• In O₃, O-O bond length is identical with that of molecular oxygen

• O₃ molecule is angular in shape.

• O₃ is an oxidising agent

Write with a balanced chemical equation how gypsum is used for the conversion of ammonia into ammonium sulnate without using H₂SO₄ ?

Sodium pyrophosphate is represented by which of the following formula ?

• Na₂P₂O₄

• Na₄P₂O₅

• Na₄P₂O₇

• Na₂P₂O₅

The starting material used in Solvay's process  are

• sodium sulphate

• brine solution

• carnallite

• all of the above

Which one of the following can produce hydrogen when treated with metallic sodium?

• (CH₃)₂NH

• CH₃NH₂

• C₆H₅NH₂

• CH₃CONH₂