EASY
Chemistry
IMPORTANT
Earn 100
Which of the following metal salts gives a red and opaque borax bead in the reducing flame (in cold)?
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Important Questions on Theoretical Principles of Experimental Chemistry
MEDIUM
Chemistry
IMPORTANT
Reaction of with conc. liberates a gas that turns moist blue litmus paper red. When gas is passed into a test tube containing egg shell powder suspended in water another gas, is generated which when passed through lime water makes it milky. The gases and respectively, are
EASY
Chemistry
IMPORTANT
The gas produced from thermal decomposition of is
MEDIUM
Chemistry
IMPORTANT
A hydrated salt of a bivalent metal when heated strongly produces a mixture of gases which when bubbled through solution produces a white solid. This solid on treatment with dilute dissolves a part of the solid leaving another part insoluble which is filtered. The filtrate on treatment with water slowly precipitates another white solid, which is not soluble in . The gas mixtures are -
EASY
Chemistry
IMPORTANT
Oxalic acid when treated with potassium permanganate in the presence of an acid, produces
EASY
Chemistry
IMPORTANT
Which one of the following cations will give a green coloured ash, when a piece of filter paper dipped in a solution containing its salt and is burned?
EASY
Chemistry
IMPORTANT
A mixture of two salts is not water soluble but dissolves completely in dilute to form a colourless solution. The mixture could be:
EASY
Chemistry
IMPORTANT
When heated in air, brown copper powder turns black. This black powder would then turn brown again when heated with:
HARD
Chemistry
IMPORTANT
A white crystalline substance dissolves in water. On passing in this solution, a black precipitate is obtained. The black precipitate dissolves completely in hot . On adding a few drops of concentrated , a white precipitate is obtained which is soluble in ammonium acetate. The white precipitate is that of:
