What is a green-yellow, pungent gas which turns damp blue litmus paper red, then bleached?

What is a metal cation which forms blue precipitate with alkali.

What is the gas which turns acidified potassium dichromate (VI) from orange to green?

What is the reason why zinc hydroxide, aluminium hydroxide and lead(II) hydroxide can dissolve in excess sodium hydroxide solution?

What is the process when iron(II) hydroxide becomes iron(III) hydroxide called?

What is the metal to be added when testing for nitrates?

Excess ammonia solution is added to an aqueous solution which contains calcium ions and copper(II) ions. What should be observed?

Effervescence occurred when hydrochloric acid is added to salt X. What is X?

White precipitate formed when several drops of AgNO3 solution is added to salt Y. What is Y?

Ammonia solution is added in excess to solution X. White ppt dissolves in the excess ammonia solution. What is X?

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