A glassy bead formed by heating borax on a platinum wite loop is
1.Sodium tetraborate
2.Sodium metaborate
3.Sodiummetaborate and boric anhydride
4.Boric anhydride and Sodium tetraborate.
Posted Date:-2021-09-27 13:37:29
A metal salt solution forms a yellow precipitate with potassium chromate in acetic acid and a white precipitate with dilute sulphuric acid but gives no precipitate with sodium chloride or iodide. The white precipitate obtained when sodium carbonate is added to the metal salt solution comsists f
1. Lead carbonate
2.Basic lead carbonate
3.Barium carbonate
4.Strontium carbonate.
Posted Date:-2021-09-27 13:37:29
A minute quantity of cupric salt is heated on borax bead in reducing foame of bunsen burner the colour of bead aftercooling will be
1.Blue
2.Brown red
3.Colourless
4.Green.
Posted Date:-2021-09-27 13:37:29
A moisten salt is rubbed with oxalic acid between the fingers and smells like vinegar. It indicates the presence of
1.Sulphur
2.Nitrate
3.Nitrite
4.Acetate.
Posted Date:-2021-09-27 13:37:29
A one litre flask is full of brownbromine vapour. The intensity of brown colour of vapour will not decrease appreciably on adding to the flask some
1.pieces of marble
2.animal charcoal powder
3.carbon tetrachloride
4.carbon disulphide.
Posted Date:-2021-09-27 13:37:29
Carbonates of the cation of group V are
1.black
2.green
3.white
4.yellow.
Posted Date:-2021-09-27 13:37:29
Certain Inorganic salt gives yellow precipitate with silver nitrate. The precipitate dissolves in dilute nitric acid as well as in ammonium hydroxide. The solution contains
1.Bromide ions
2.Iidide ions
3.Phosphate ions
4.Chromate ions.
Posted Date:-2021-09-27 13:37:29
Certain inorganic salt when introduced in flame produces crimson red colour. It indicates the presence of
1.Dichromate ion
2.Thiosulphate ion
3.Strontium ion
4.Calcium ion.
Posted Date:-2021-09-27 13:37:29
Formation of a rose-red precipitiate when a slightly alkaline solution of an inorganic salt is treated with dimethylglyoxime confirms the presence of
1.Cobalt
2.Zinc
3.Iron
4.Nickel.
Posted Date:-2021-09-27 13:37:29
If ammonium hydroxide solution is added to the aqueous solution of chromium sulphate what will form?
1.Greenish precipitate
2.Yellow precipitate
3.White turbidity
4.A clear transparent yellow solution.
Posted Date:-2021-09-27 13:37:29
In qualitative analysis of basic radicals hydrochloric acid preferred to nitric acid for preparing a solution of given substance. This is because
1.Zinc nitrate
2.Silver nitrate
3.nitrates are not decomposed to sulphides
4.hydrochloric acid is not an oxidising acidchlorides are easily converted to sulphides.
Posted Date:-2021-09-27 13:37:29
Nitric acid is generally not used for preparation of original solution in analysis of basic radicals because with the scheme of analysis.
1.It is a strong oxidising agent
2.It is reducing agent
3.It forms insoluble nitrates
4.None of them
Posted Date:-2021-09-27 13:37:29
Sodium sulphide react with sodium nitroprusside to form a purple colured compund. During the reaction the oxidation state of iron
1.Changes from + 2 to + 3
2.Changes from + 3 to + 2
3.Changes from + 2 to + 4
4.Remains unchanged.
Posted Date:-2021-09-27 13:37:29
Sulphuric acid is not used for the preparation of original solution in the analysis of basic radicals because
1.It forms insoluble sulphates with some of the basic radicals
2.It is a strong oxidising agent
3.It is a strong reducing agent
4.It decomposes many ot the anions.
Posted Date:-2021-09-27 13:37:29
The aqueous solution of which of the following reagent will give prussian blue coloured precipitate with an aqueous solution containing iorn (III) ions.
1.Potassium thiocyanate
2.Potassium hexacyanoferrate (II)
3.Potassium pyroantimonate
4.All of the above.
Posted Date:-2021-09-27 13:37:29
The metal whose salts do not give the borax bead test is
1.Cr
2.Ni
3.Pb
4.Mn.
Posted Date:-2021-09-27 13:37:29
The name of the blue product of the reaction between ferrous ion and ferricyanide ion is
1.Thenard blue
2.Turnbulls blue
3.Prussian blue
4.Ultramarine blue.
Posted Date:-2021-09-27 13:37:29
The salt of which of the following metal gives violet colour in borax bead test?
1.Fe
2.Ni
3.Co
4.Mn.
Posted Date:-2021-09-27 13:37:29
The salts of which of the following metal give white residue in charcoal cavity test but ash in cobalt nitrate test?
1.Copper
2.Zinc
3.Aluminium
4.Cobalt.
Posted Date:-2021-09-27 13:37:29
Two colourless solutions are mixed. A white precipitate results which turns black on addition of ammonia. The two solutions are respectively
1.Lunar caustic and hypo
2.Mercurous nitrate and sodium chloride
3.Washing soda and barium nitrate
4.Sodium bicarbonate and calcium nitrate
Posted Date:-2021-09-27 13:37:29
Whcih of the following is a white powder that is insoluble in water?
1.White vitriol
2.Mercury (I) chloride
3.Sodium carbonate
4.Calcium bicarbonate.
Posted Date:-2021-09-27 13:37:29
Whcih of the following pairs of reagents will give white precipitate with aqueous solution of sodium chloride?
1.Silver nitrate potassium chromate
2.Potassium chromate potassium cobaltinitrite
3.Silver nitrate Potassium pyroantimonate
4.Silver nitrate potassium oxalate.
Posted Date:-2021-09-27 13:37:29
Which of following salt contains two different metal atoms but gives test for only one in the aqueous solution?
1.Mohrs salt
2.Potash alum
3.Potassium ferrocyanide
4.Carnallite.
Posted Date:-2021-09-27 13:37:29
Which of the followign salts is coloured but gives wihte residue in dry heating test?
1.Berium carbonate
2.Barium chloride dihydrate
3.Copper (II) sulphate pentahydrate
4.Copper (II) chloride.
Posted Date:-2021-09-27 13:37:29
Which of the following halide is soluble in water ?
1.AgF
2.AgCl
3.AgBr
4.AgI.
Posted Date:-2021-09-27 13:37:29
Which of the following is insoluble in AcOH?
1.Clacium oxide
2.Clacium carbonate
3.oxalate
4.Clacium hydroxide.
Posted Date:-2021-09-27 13:37:29
Which of the following is not a preliminary test ?
1.Flame test
2.Borax bead test
3.Permanganate test
4.Brown ring test.
Posted Date:-2021-09-27 13:37:29
Which of the following is soluble in yellow ammonium sulphide ?
1.CuS
2.CdS
3.SnS
4.PbS.
Posted Date:-2021-09-27 13:37:29
Which of the following precipitate are dirty white in colour?
1.CoS
2.ZnS
3.CuS
4.MnS.
Posted Date:-2021-09-27 13:37:29
Which of the following salts does not liberate carbondioxide on treatment with dilute hydrochloric acid?
1.Bismuth carbonate
2.Copper carbonate
3.Calcium carhonate
4.Basic lead carhonate.
Posted Date:-2021-09-27 13:37:29
Which of the following sulphide is completely precipitated only when the acidic solution is made dilute ?
1.HgS
2.PbS
3.CdS
4.CuS.
Posted Date:-2021-09-27 13:37:29
Which of the following sulphides has lowest solubility product?
1.FeS
2.MnS
3.PbS
4.ZnS.
Posted Date:-2021-09-27 13:37:29
Which performing the flame test the paste of the salt in made in HCl because
1.HCl is a strong acid
2.HCl is non-oxidising acid
3.Chlorides are relatively volatile
4.HCl is cheaper.
Posted Date:-2021-09-27 13:37:29
Which sodium thiosulphate solution is shaken with iodine thiosulphate is changed to
1.Lead nitrate.
2.Sulphate ion
3.Tetrathionate ion
4.None of them
Posted Date:-2021-09-27 13:37:29
Which sulphides are soluble only in aqua regia?
1.NiS
2.CoS
3.HgS
4.All of the above.
Posted Date:-2021-09-27 13:37:29
Which types of salt produce crackcling noise in dry heating test?
1.Salts which have lot of water of crystallisation
2.Salts which are hygroscopic
3.Salts which have lost water of crystallisation
4.Salts which entrap mother liquor in crystals.
Posted Date:-2021-09-27 13:37:29