Practical Chemistry – Inorganic (IOC)

Treatment of a gas 'X' with a freshly prepared ferrous sulphate solution gives a compound 'Y' as a brown ring. The compounds X and Y are:

1. NO and [Fe(NO)]SO4
2. NO2 and [Fe(NO2)]SO4
3. N2O and [Fe(N2O)]SO4
4. N2O4 and [Fe(N2O4)]SO4

A paper dipped in a dil. H2SO4 solution of 'X' upon treatment with SO2 gas turns into green. The compound 'X' is :

1. KI-starch
2. KMnO4
3. Pb(CH3COO)2
4. K2Cr2O7

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-

Among Fe2+, Fe3+, Cr2+ and Zn2+, the ion that shows positive borax bead test and with highest ionisation enthalpy is :

1. Fe2+
2. Zn2+
3. Cr2+
4. Fe3+

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

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

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

On heating a mixture of common salt and K2Cr2O7 in equal amount along with concentrated H2SO4 in a test tube, a gas is evolved. Formula of the gas evolved and oxidation state of the central metal atom in the gas respectively are:

1. Cr2O2Cl2 and +3
2. Cr2O2Cl2 and +6
3. CrO2Cl2 and +6
4. CrO2Cl2 and +5

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

Formation of Na4[Fe(CN)5NOS], a purple coloured complex formed by addition of sodium nitroprusside in sodium carbonate extract of salt indicates the presence of:

1. Sulphide ion
2. Sulphite ion
3. Sulphate ion
4. Sodium ion

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

Among the following cations, the number of cations which will give characteristic precipitate in their identification tests with K4[Fe(CN)6] is . Cu2+, Fe3+, Ba2+, Ca2+, NH4+, Mg2+, Zn2+

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

Consider the following test for a group-IV cation. M2+ + H2S A (Black precipitate) + byproduct A + aqua regia B + NOCl + S + H2O B + KNO2 + CH3COOH C + byproduct The spin-only magnetic moment value of the metal complex C is BM (Nearest integer)

Match List I with List II Choose the correct answer from the options given below:

1. A-III, B-I, C-IV, D-II
2. A-III, B-IV, C-I, D-II
3. A-III, B-II, C-IV, D-I
4. A-III, B-I, C-II, D-IV

Match List I with List II Choose the correct answer from the options given below:

1. A-III, B-IV, C-I, D-II
2. A-III, B-IV, C-II, D-I
3. A-IV, B-III, C-II, D-I
4. A-IV, B-III, C-I, D-II

During the detection of acidic radical present in a salt, a student gets a pale yellow precipitate soluble with difficulty in NH4OH solution when sodium carbonate extract was first acidified with dil. HNO3 and then AgNO3 solution was added. This indicates presence of :

1. I-
2. CO32-
3. Cl-
4. Br-

Consider the following reactions NiS + HNO3 + HCl A + NO + S + H2O [figure] The number of protons that do not involve in hydrogen bonding in the product B is .

[figure] In a borax bead test under hot condition, a metal salt (one from the given) is heated at point B of the flame, resulted in green colour salt bead. The spin-only magnetic moment value of the salt is BM (Nearest integer) [Given atomic number of Cu = 29, Ni = 28, Mn = 25, Fe = 26]

While preparing crystals of Mohr's salt, dil H2SO4 is added to a mixture of ferrous sulphate and ammonium sulphate, before dissolving this mixture in water, dil H2SO4 is added here to :

1. prevent the hydrolysis of ferrous sulphate
2. prevent the hydrolysis of ammonium sulphate
3. increase the rate of formation of crystals
4. make the medium strongly acidic

When MnO2 and H2SO4 are added to a salt (A), a greenish yellow gas is liberated. The salt (A) is :

1. NH4Cl
2. CaI2
3. KNO3
4. NaBr

The number of white coloured salts, among the following is (a) SrSO4 (b) Mg(NH4)PO4 (c) BaCrO4 (d) Mn(OH)2 (e) PbSO4 (f) PbCrO4 (g) AgBr (h) PbI2 (i) CaC2O4 (j) [Fe(OH)2(CH3COO)]

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

Molar mass of the salt from NaBr, NaNO3, KI and CaF2 which does not evolve coloured vapours on heating with concentrated H2SO4 is g mol-1. (Molar mass in g mol-1 : Na : 23, N : 14, K : 39, O : 16, Br : 80, I : 127, F : 19, Ca : 40)