CHEMISTRY IITJEE, AIPMT test-INORGANIC

Dimethyl glyoxime and NaHSO3/NH4CNS are used to distinguish and separate Cu2+ an Ni2+. These are used in order:
HSO-3/CNS- then DMG
DMG then HSO-3/CNS-
At random
Given reagents are not suitable?
PbO2 oxidises MnO2 (black) to:
MnO2-4
MnO-4
Mn2+
Mn2O7
By H2O2/OH-, Cr(OH)3 changes to:
CrO3
Cr2O2-7
CrO2-4
[Cr(OH)4]-
Which cation cannot be identified by flame test?
Na+
K+
Ba2+
Mg2+
Microcosmic salt and borax are used in the identification of cations by dry tests. They are respectively:
NaBO2 and NaPO3
NaNH4HPO4 . 4H2O and Na2B4O7. 10H2O
NaPO3 and NaBO2
Na2B4O7 and NaNH4HPO4
Colourless salt (A) + dil. H2SO4 + KI ( blue colour with starch. (A) can be:
K2Cr2O7
MnO2
NH4NO2
NH4Cl
The ion most difficult to remove as a precipitate is:
Ag+
NH+4
Fe3+
Cu2+
CoS (black) obtained in group IV of salt analysis is dissolved in qua-regia, treated with an excess of NaHCO3 and thenBr2 water is added. An apple green coloured stable complex is formed. It is:
Sodium cobaltocarbonate
Sodium cobaltibromide
Sodium cobalticarbonate
Sodium cobaltobromide
A is a colourless subsance. Aqueous solution of A gives reddish-orange ppt. with KI; ppt. dissolves in excess of KI forming a colourless solution. If NH4Cl and NaOH solution is added to this colourless solution reddish brown ppt. is formed. Substance A is:
Epsom salt
Mohr’s salt
Calomel
Corrosive sublimate
When a substance A reacts with water it produces a combustible gas B and a solution of substance C in water. When another substance D reacts with this solution of C, it also produces the same gas B on warming but D can produce gas B on reaction with dilute sulphuric acid at room temperature. A imparts a deep golden yellow colour to a smokeless flame of Bunsen burner. A, B, C, and D, respectively are:
Na, H2, NaOH, Zn
K, H2, KOH, Al
CaH2, Ca(OH)2, Sn
CaC2, C2H2, Ca(OH)2, Fe
A mixture upon adding conc. H2SO4 gives orange red fumes. It may contain the anion pair:
CrO2-4 + Cl-
Br- + Cl-
NO-3 + Cl-
CrO2-4 + NO-3
‘X’ is a colourless salt giving following reactions: NaOH AgNO3 X ( X ( White ppt. soluble HNO3 White ppt. in excess of NaOH NH4OH ( H2S soluble in za.NH3 white ppt X can be:
Alcl3
ZnCl2
Zn(CH3COO)2
ZnBr2
A yellow solid known to be a single compound is completely insoluble in hot water but dissolves in hot dilute HCl to give an orange solution. When this solution is cooled, a white crystalline ppt is formed. This white ppt. redissolves on heating the solution. The compound is:
Fe(OH)3
PbCrO4
K2CrO4
Co(OH)2
Some white colourless crystals are heated. A cracking sound is heard and brown fumes are given off. The residue is yellow-brown in colour. When a glowing splinter is held in the fumes, it is relighted. The fumes consists of:
O2
NO2
Cl2
NO2 and O2
A suspension containing insoluble substances ZnS, CuS, HgS, Ag2S, FeS, is treated with 2N HCl. On filtering, the filtrate contained appreciable amounts of which one of the following groups?
Zinc and mercury
Silver and iron
Copper and mercury
Zinc and iron
Description:

mcq based

Discussion
DIPANKAR DAS
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