HARD
Earn 100
Ozone when reacts with potassium iodide solution liberates certain product, which turns starch paper blue. The liberated substance is.......
100% studentsanswered this correctly
Important Questions on Theoretical Principles of Experimental Chemistry
HARD
A white precipitate was formed when was added to water extract of an inorganic salt. Further, a gas with characteristic odour was released when the formed white precipitate was dissolved in dilute HCI. The anion present in the inorganic salt is:
EASY
The blue colour produced when a starch solution is added to a solution containing traces of is due to
(I) formation of
(II) formation of an inclusion complex
(III) Oxidation of starch
(IV) Oxidation of
MEDIUM
Match List I with List II.
| List-I (Anion) |
List-II (gas evolved on reaction with dil. ) |
||
| (A) | (I) |
Colourless gas which turns lead acetate paper black. |
|
| (B) | (II) |
Colourless gas which turns acidified potassium dichromate solution green. |
|
| (C) | (III) | Brown fumes which turns acidified KI solution containing starch blue. | |
| (D) | (IV) | Colourless gas evolved with brisk effervescence, which turns lime water milky. |
Choose the correct answer from the options given below
MEDIUM
Which combines with to form brown complex?
EASY
On heating, lead (ll) nitrate gives a brown gas (A). The gas (A) on cooling changes to a colourless solid/liquid (B). (B) on heating with NO changes to ablue solid (C). The oxidation number of nitrogen in solid (C) is:
MEDIUM
A white sodium salt dissolves readily in water to give a solution which is neutral to litmus. When silver nitrate solution is added to the before mentioned solution, a white precipitate is obtained which does not dissolve in dilute nitric acid. The anion is:
EASY
In the detection of II group acid radical, the salt containing chloride is treated with concentrated sulphuric acid, the colourless gas is liberated. The name of the gas is
EASY
When treated with conc. yields gas which further reacts with to generate a white solid reacts with dil. to produce the same gas the solid is
EASY
Reaction of an inorganic sulphite with dilute generated compound . Reaction of with gives . Further, the reaction of with and water affords compound and , respectively, are :
MEDIUM
Sodium nitroprusside, when added to an alkaline solution of sulphide ions, produce a
HARD
When a mixture of and concentrated is heated in a dry test tube, a red vapour is evolved. This vapour turns an aqueous solution of yellow due to the formation of and respectively, are:
HARD
The reagent(s) that can selectively precipitate from a mixture of and in aqueous solution is (are)
MEDIUM
The sodium salt of an organic acid produces effervescence with concentrated . reacts with the acidified aqueous solution to give a white precipitate which decolourises acidic solution of . is
MEDIUM
and both when dissolved in water containing ions the pair of species formed is:
EASY
What is silver nitrate test?
MEDIUM
Write equations, including state symbols to describe the reactions taking place in the test tube between concentrated sulfuric acid and potassium iodide.
HARD
When a white solid () reacts with concentrated , the products include pungent smelling gases and a dark brown solution containing a yellow precipitate. When aqueous solution of thiosulphate is added, the precipitate remains but the dark brown colour disappears. The compound '' is
EASY
Starch-iodide paper is used to test the presence of-
EASY
A salt gives violet vapours when treated with conc. . It contains
MEDIUM
Working with a partner, discuss what you would see in a test tube in which concentrated sulfuric acid is added drop-wise to solid potassium iodide that you would not see if the acid was added to potassium chloride.
