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Nabira Mahavidyalaya,Katol, Master of Science(M.Sc) Semester-I
EXAMINATION SUMMER -2020 CH-104 Paper IV(Analytical Chemistry)
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Note-(1) All questions are compulsory(40). Each questions carry 2 marks. (2) Time: 1 Hour, Maximum Marks-80
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1) The arithmetic average of a replicate set of results.
2 points
a) Median
b) Degree of freedom
c) Mean
d) None of the above
Clear selection
2) The nearness of a measurement or result to the true value known as------
2 points
a) Accuracy
b) Precision
c) Mode
d) Degree of freedom
Clear selection
3) The numerical difference between the highest and lowest results in a set called as-----
2 points
a) Deviation
b) Standard deviation
c) Variance
d) Spread
Clear selection
4) How many significant figures are in 25.60?
2 points
a) 3
b)2
c) 4
d) 5
Clear selection
5) -------------includes faulty equipment, uncalibrated weights and uncalibrated volumetric glassware.
2 points
a) Operative errors
b) Personal errors
c) Instrumental Errors
d) None of these
Clear selection
6)Determinate errors is also known as-------
2 points
a) Systematic errors
b) Accidental errors
c) Random errors
d) All of the above
Clear selection
7) Calculate the median for the following data 61.45,61.51,61.12 and 61.40
2 points
a) 61.48
b) 61.42
c)61.51
d) 61.31
Clear selection
8) The result of the arithmetical operation 21.1 X 0.029 X 83.2 expressed to the correct number of significant figures is-----
2 points
a) 50.91008
b) 50.91
c) 50.910
d) 51
Clear selection
9) ------------ errors represents the experimental uncertainty that occurs in many measurement made by the same analyst under virtually identical conditions and they cannot be predicted or estimated.
2 points
a) Determinate
b) Indeterminate
c) Systematic
d) None of these
Clear selection
10.The square of the standard deviation is known as------
2 points
a) The coefficient of varance
b) The absolute deviation
c) The variance
d) The relative standard deviation
Clear selection
11) The distribution of a solute between two immiscible solvents is governed by:
2 points
a) Nernst distribution law
b) Henry`s law
c) Ostwald`s dilution law
d) Raoult`s law
Clear selection
12) The common locating agent used to identify amino acids:
2 points
a) Iodine vapour
b) Ninhydrin
c) Permanganate
d) Hydrogen sulphide
Clear selection
13) The basis of separation in ion-exchange chromatography is
2 points
a) Chemical exchange
b) Adsorption
c) Absorption
d) None of the above
Clear selection
14) A mixture of chloride and bromide ions can be separated by making use of a:
2 points
a) Strong-acid cation exchanger
b) Weak –acid cation exchanger
c) Strong-base anion exchanger
d) Weak-base anion exchanger
Clear selection
15) Paper chromatography is a form of partition chromatography in which the stationary phase is ----
2 points
a)Ethanol
b) Adsorbed Water present in filter paper
c) Methanol
d)Butanol
Clear selection
16) For identification purposes, in chromatography the spots are characterized by their -----------factor.
2 points
a)Retardation or retention
b) Redox
c) Redeveloped
d) None of these
Clear selection
17) Chromatographic techniques are based on four different sorption mechanisms,namely surface adsorption,partition,ion exchange and ----------------.
2 points
a) Extinction
b) Exclusion
c) Extinct
d) All of the above
Clear selection
18) The supports useful in TLC are.
2 points
a) Silica gel
b) Alumina
c) Cellulose
d) All of the above
Clear selection
19) Almost all the solvents which have been used in---------chromatography, can also be used in adsorption TLC
2 points
a) Column
b) Ion-exchange
c) Paper
d) None of the above
Clear selection
20) Numerous combinations are possible for the mobile phase in paper chromatography. These include
2 points
a) Mixture of two, three or more solvents
b) Solutions of salts
c) Solutions of buffers
d) All
Clear selection
21) The indicator methylorgange works in the pH range
2 points
a) 3.5-5
b)8-10
c)1-2
d)4-6
Clear selection
22) Basicity of an acid is the number of replaceable ---------------atoms present per molecule.
2 points
a) Bromine
b) Chlorine
c) Flourine
d) Hydrogen
Clear selection
23) Murexide, a metal ion indicator is used in ----------------titrations.
2 points
a) Normal
b) Standard
c) Complexation
d) All of the above
Clear selection
24) Which analytical method is based on the weight on the ppt?
2 points
a) Acid base titration
b)Complexometric titration
c) Precipitation titration
d)Gravimetry
Clear selection
25) Which sentence is false about Gravimetric analysis?
2 points
a) It is used for inorganic ion
b) It is used to assay barium sulphate
c)It is used to assay of aluminium
d) Relative precision 3 to 4%.
Clear selection
26) How many types of gravimetric analysis?
2 points
a) One
b) Two
c) Three
d) Four
Clear selection
27) Precipitation methods in gravimetric analysis is ----
2 points
a) Precipitation of solvent
b)Vaporizations of solutions
c) A and B
d) All of these
Clear selection
28) Volatilizations methods in gravimetric analysis is ----
2 points
a) Precipitation of solvent
b)Vaporizations of solutions
c) A and B
d) None of these
Clear selection
29) --------------is a suitable indicator for the titration of strong acid and weak alkali.
2 points
a) Methyl orange
b) Phenolphthalein
c)Litmus solution
d) Universal indicator
Clear selection
30) --------------is a suitable indicator for the titration of weak acid and strong alkali.
2 points
a) Methyl orange
b) Phenolphthalein
c)Litmus solution
d) Universal indicator
Clear selection
31) Potentiometry is a technique used to determine the amount of substance in solution by measuring the electromotive force:
2 points
a) At the cathode
b) At the Anode
c) Between the cathode and anode
d) None of the above
Clear selection
32) The emf measured between a single indicator electrode and a single reference electrode is the
2 points
a) Potential difference
b) Conductance
c) Resistance
d) None of the above
Clear selection
33) An electrode with a constant emf used in conjunction with an indicator electrode is a
2 points
a) Reference electrode
b) Indicator electrode
c) Working electrode
d) Auxiliary electrode
Clear selection
34) Which of the following statements are correct
2 points
a) The potentiometric end point determination can be applied to all types of reactions
b) It can be used for coloured or opaque solutions
c) It is readily adapted to instruments for automatic titration
d) All are correct.
Clear selection
35) For potentiometric methods
2 points
a) An indicator electrode whose response is sensitive to one or more of the species being determined is immersed in a solution of the sample
b) A reference electrode of known potential,such as calomel electrode is then brought in contact with the sample
c) A salt bridge is used between indicator and reference electrode
d) All are correct.
Clear selection
36) A conductance measurements, requires.
2 points
a) A source of electrical power
b) A cell to contain the solution
c) A suitable bridge to measure the resistance of the solution
d) All are correct
Clear selection
37)In conductance measurements, the platinum electrodes are ordinarily platinised
2 points
a) To increase their effective surface
b) To increase their capacitance
c) both a and b
d) None of these
Clear selection
38) Which is not application of Conductometry?
2 points
a) determine of moisture and water contain
b)Purity of water
c)Ionic product of water.
d) Conductometric titration & precipitation titration
Clear selection
39) If the ion sizes decrease in the solutions
2 points
a)Conductance decreases
b)Conductance increases
c) both a and b
d)None of the above
Clear selection
40) In conductometry solution if temp. is increase by 1ºc
2 points
a).1% rise in mobility of ions.
b.2% rise in mobility of ions.
c.3% rise in mobility of ions.
d.4% rise in mobility of ions.
Clear selection
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