Analytical Chemistry Mid - I, September - 2014

1.The spectrum obtained from molecular species is called
  • continuous spectrum
  • rotational spectrum
  • band spectrum
  • line spectrum
Answer: C
2.The main reason for co-precipitation is
  • Solubility of other ions
  • adsorption of ions on the particles of precipitate
  • desorption of ions from the precipitate
  • Ions are insoluble in the solution
Answer: B
3.The process in which some impurities are enclosed inside the growing crystal
  • Post precipitation
  • co-precipitation
  • adsorption
  • occlusion
Answer: D
4.Which of the following is an example of metal –ion indicator
  • Eriochrome black- T
  • methyl orange
  • phenol red
  • Diphenyl benzidine
Answer: A
5.In brass analysis zinc will be precipitated as
  • Zn3(PO4)2
  • Zn NH4 PO4
  • Zn SO4
  • Zn2 P2 O4
Answer: B
6.Which of the following compounds doesnot absorb UV. radiation
  • Heptane
  • butadiene
  • Nitro benzene
  • 1,3,5,7 – Octa tetrane
Answer: A
7.Arrange the following compounds in the increasing order of max.
  • H2C = CH2
  • 1,3 – butadiene
  • 1,3,5 - hexatriene
  • n- butane
Answer: A
8.Which of the following will have highest PH.
  • 0.1N HCl
  • 0.1N CH3COOH
  • 0.1 N NaOH
  • 0.01 N NaOH
Answer: C
9.Which of the following information cannot be obtained from an IR-Spectrum
  • The molewlae mass
  • The presence of C = 0 band
  • The presence of O-H bands
  • the identity of a compound through comparison with other spectra
Answer: A
10.Amino acids are visualized in TLC by reacting with
  • Aniline Reagent
  • Ninhydrin
  • UV
  • Iodine
Answer: B
11.In the analysis of brass, Sn will be separated as ___________________.
Answer: H2SnO3
12.The colour of Ni-DMG complex is ________________.
Answer: Brigh
13.The red colour of methyl orange is due to its ____________________ structure.
Answer: Quinnoid structure
14.Shift in absorption towards longes wave length is called __________________ shift.
Answer: bathochromic
15.Suitable indicator for a strong acid- strong base titration is ________________.
Answer: phenolphthalein
16.Retension factor is defined as _________________.
Answer: distance traveled by compound /distance traveled by solvet
17.__________________ chromatography method is useful for separating large amount of sample.
Answer: column
18.The Beer lambeat law gives a linear correlation with positive gradient between ___________ and ______________
Answer: absorbance, concentration
19.In IR spectroscopy a bsorphian of electromagnetic radiation results in transitions between ______________energy levels.
Answer: vibrational
20.The carbonyl stretching band C = 0 of saturated aliphatic ketones appears at ____________ cm-1 kentones.
Answer: 1715