Principles Related to Practical Chemistry

Among Fe3+, Pb2+, Cu2+ and Mn2+, identify the one that gets precipitated out while passing H2S in presence of NH4OH as group reagent. The highest possible oxidation state of the corresponding metal is

1. +3
2. +4
3. +2
4. +7

A salt with few drops of conc. HCl gives apple green colour in flame test. The group precipitate of the salt is dissolved in acetic acid and treated with K2CrO4 to give yellow precipitate. When the sodium carbonate extract of the salt solution is heated with conc. HNO3 and ammonium molybdate, it resulted a canary yellow precipitate. The cation and anion present in the salt are respectively,

1. Ca2+ and SO42-
2. Ba2+ and PO43-
3. Mn2+ and PO43-
4. Ba2+ and SO42-

Consider three metal chlorides x, y and z, where x is water soluble at room temperature, y is sparingly soluble in water at room temperature and z is soluble in hot water. x, y and z are respectively

1. AgCl, Hg2Cl2 and PbCl2
2. CuCl2, AgCl and PbCl2
3. AlCl3, PbCl2 and BaCl2
4. MgCl2, AgCl and AlCl3

In the Group analysis of cations, Ba2+ & Ca2+ are precipitated respectively as

1. sulphide & sulphide
2. hydroxide & carbonate
3. chromate & sulphide
4. carbonate & carbonate

Consider the following reactions. (Hot solution)PbCl2 + K2CrO4 A + 2KCl A + NaOH B + Na2CrO4 PbSO4 + 4CH3COONH4 (NH4)2SO4 + X In the above reactions, A, B and X are respectively.

1. Na2[Pb(OH)2], PbCrO4 and [Pb(NH3)4]SO4
2. Na2[Pb(OH)2], PbCrO4 and (NH4)2[Pb(CH3COO)4]
3. PbCrO4, Na2[Pb(OH)4] and (NH4)2[Pb(CH3COO)4]
4. PbCrO4, Na2[Pb(OH)4] and [Pb(NH3)4]SO4

When a salt is treated with sodium hydroxide solution it gives gas X. On passing gas X through reagent Y a brown coloured precipitate is formed. X and Y respectively, are

1. X = NH3 and Y = HgO
2. X = NH4Cl and Y = KOH
3. X = NH3 and Y = K2HgI4 + KOH
4. X = HCl and Y = NH4Cl

Choose the correct tests with respective observations. Choose the correct answer from the options given below :

1. A, D and E only
2. A, B and C only
3. B, D and E only
4. C, D and E only

The metal ion whose electronic configuration is not affected by the nature of the ligand and which gives a violet colour in non-luminous flame under hot condition in borax bead test is

1. Cr3+
2. Ti3+
3. Ni2+
4. Mn2+

Identify the inorganic sulphides that are yellow in colour : Choose the correct answer from the options given below :

1. (D) and (E) only
2. (A) and (B) only
3. (A), (D) and (E) only
4. (A) and (C) only

Find the compound 'A' from the following reaction sequences. A aqua-regiaB [(2) AcOH](1) KNO2, NH4OH yellow ppt

1. NiS
2. MnS
3. ZnS
4. CoS

Identify A, B and C in the given below reaction sequence [figure]

1. PbCl2, PbSO4, PbCrO4
2. PbS, PbSO4, Pb(CH3COO)2
3. PbS, PbSO4, PbCrO4
4. PbCl2, Pb(SO4)2, PbCrO4

In the precipitation of the iron group (III) in qualitative analysis, ammonium chloride is added before adding ammonium hydroxide to :

1. decrease concentration of -OH ions
2. increase concentration of Cl- ions
3. prevent interference by phosphate ions
4. increase concentration of NH4+ ions

Given below are two statements : In the light of the above statements, choose the most appropriate answer from the options given below :

1. Statement I is false but Statement II is true
2. Both Statement I and Statement II are true
3. Statement I is true but Statement II is false
4. Both Statement I and Statement II are false

The compound that is white in color is

1. ammonium sulphide
2. ammonium arsenomolybdate
3. lead iodide
4. lead sulphate

On passing a gas, 'X', through Nessler's reagent, a brown precipitate is obtained. The gas 'X' is

1. Cl2
2. CO2
3. NH3
4. H2S

A reagent which gives brilliant red precipitate with Nickel ions in basic medium is

1. dimethyl glyoxime
2. sodium nitroprusside
3. meta-dinitrobenzene
4. neutral FeCl3

Yellow compound of lead chromate gets dissolved on treatment with hot NaOH solution. The product of lead formed is a :

1. Tetraanionic complex with coordination number six
2. Neutral complex with coordination number four
3. Dianionic complex with coordination number six
4. Dianionic complex with coordination number four