Write the preparation of sodium dichromate from chromite ore `(FeCr_(2)O_(4))`.

Describe the preparation of potassium dichromate from iron chromite ore. What is the effect of increasing pH on a solution of potassium dichromate ?

Write the industrial preparation of dihydrogen from water.

Write the preparation of K_(2)MnO_(4) from pyrolusite are (MnO_(2)) . Write the type of magnetism shown by KMnO_(4) and K_(2)MnO_(4) .

This question has Statement I and Statement II. Of the four choices given after the Statements, choose the one that best describes the two Statements. Statement -1 : Na2SO_4 can be used as the starting material for the preparation of sodium carbonate and sodium hydroxide Statement - II: Sodium hydroxide is prepared by the treatment of milk of lime with sodium carbonate.

Write the hybridisation and magnetic character of [Co(C_(2)O_(4))_(3)]^(3-) . (At. No. of Co = 27)

Which of the following ores cannot be concentrated by electromagnetic separation? Chromite (FeCr_(2)O_(4)), magnetite (Fe_(3)O_(4)) , zinc blende (ZnS) , pyrolusite (MnO_(2)) .

Indicate the steps in the preparation of : KMnO_(4) from pyrolusite ore.

Write any three methods of preparing formaldehyde from alcohol.

Give the equations for the preparation of N_(2)O from the following: NH_(3), O_(2), Pt and H_(2)O .

Write with balanced equation the reaction for the manufacture of sodium bicarbonate from sodium carbonate.