Engineering Entrance Sample Papers

Chemical Analysis Questions and Answers

Chemical analysis QUIZ

Chemical Analysis Practice Problems

Question 1
The metal that does not give the borax-bead test is
A
Manganese
B
Lead
C
Nickel
D
Chromium
Question 2
Sodium carbonate cannot be used in place of ammonium carbonate for the precipitation of the fifth group radicals because
A
Magnesium will be precipitated
B
Sodium ions interfere with the detection of fifth group radicals
C
Sodium will react with acidic radicals
D
Concentration of carbonate ions is very low
Question 3
In acidic medium, dichromate ion oxidises ferrous ion to ferric ion. If the gram molecular weight of potassium dichromate is 294 grams, its gram equivalent weight is……grams
A
49
B
127
C
24.5
D
294
Question 4
The equivalent weight of KMnO4 in alkaline medium will be Related:
A
31.60
B
52.66
C
79.00
D
158.00
Question 5
The ratio of amounts of H2S needed to precipitate all the metal ions from 100 ml of 1 M AgNO3 and 100 ml of 1 M CuSO4 is
A
1 : 2
B
Infinity
C
2 : 1
D
Zero
Question 6
H2S will precipitate the sulphides of all the metals from the solution of chlorides of Cu, Zn and Cd, if
A
The solution is acidic
B
The solution is dilute acidic
C
The solution is aqueous
D
Any of these solutions is present
Question 7
Nitrates of all the metals are

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A
Insoluble in water
B
Unstable
C
Coloured
D
Soluble in water
Question 8
When H­­2S is passed through in II group sometimes solution becomes milky. It indicates the presence of
A
An oxidising agent
B
A reducing agent
C
Thiosulphate
D
Acidic salt
Question 9
Methyl orange gives red colour in
A
Potassium hydroxide solution
B
Sodium carbonate solution
C
Sodium chloride solution
D
Hydrochloric acid solution
Question 10
A compound is soluble in water. If ammonia is added, a red precipitate appears which is soluble in dilute HCl. The compound has
A
Cadmium
B
Aluminium
C
Iron
D
Zinc
Question 11
An aqueous solution of colourless metal sulphate M, gives a white precipitate with NaOH. This was soluble in excess of NaOH. On passing H2S through this solution a white precipitate is formed. The metal M in the salt is
A
Ca
B
Ba
C
Zn
D
Al
Question 12
The number of hydroxide ions, produced by one molecule of sodium carbonate (Na2CO3) on hydrolysis is
A
3
B
2
C
1
D
4
Question 13
Metallic tin in the presence of HCl is oxidise K2Cr2O7 to stannic chloride. What volume of decinormal dichromate solution would be reduced by 1 g of tin

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A
170.50 ml
B
162.38 ml
C
175.49 ml
D
168.49 ml
Question 14
Pb++, Cu++, Zn++ and Ni++ ions are present in a given acidic solution. On passing hydrogen sulphide gas through this solution the available precipitate will contain
A
PbS and NiS
B
CuS and NiS
C
PbS and CuS
D
CuS and ZnS
Question 15
100 cm3 of 0.1 N HCl solution is mixed with 100 cm3 of 0.2 N NaOH  solution. The resulting solution is
A
0.05 N and the solution is acidic
B
0.05 N and the solution is basic
C
0.1 N and the solution is basic
D
0.1 N and the solution is acidic
Question 16
Which of the following is soluble in yellow ammonium sulphide
A
SnS
B
CuS
C
CdS
D
PbS
Question 17
50 ml 10 N – H2SO4, 25 ml 12N–HCl and 40 ml 5 N –  HNO3 were mixed together and the volume of the mixture was made 1000 ml by adding water. The normality of the resultant solution will be
A
2 N
B
1 N
C
4 N
D
3 N
There are 17 questions to complete.
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Vishal Arora

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