Pharmaceutical chemistry important mcqs (41-55)

 These are very important mcqs in pharmaceutical chemistry

41.In benzothiadiazide reduction of the double bond between the position 3 and 4 give rise to compounds with

A. Decreased diuretic activity

B. Increased diuretic activity 

C. No diuretic activity

D. No change in diuretic activity

Ans. B

42.The energy of a photon is given by the relationship E=hv where

A. E is energy of a photon in kilo-calories

B. E is energy of a photon in cycles /sec

C. E is energy of a photon in joules

D. E is energy of a photon in ergs

Ans. D

43.Benzyl chloride and potassium cyanide are used as the starting compounds for the synthesis of

A. Ethosuximide

B. Glutethimide

C. Tartaric acid

D. Malic acid

Ans. B

44.The end point of complexometric titration is shown by means of

A. pH meter

B. pM indicators

C. Colorimeter

D. Acid-base indicators

Ans. B

45.Iodine-absorbing substances are determined in phosphate buffer by addition of iodine and back titration with

A. KMno4

B. Oxalic acid

C. Sodium thiosulphate 

D. NaOH

Ans. C

46.Arsenic impurity is determined by

A. Reduction of arsenic compounds

B. Oxidation of arsenic compounds

C. Removal of arsenic compounds

D. Neutralisation of arsenic compounds 

Ans.A

47.Thiotepa, a cytotoxic agent, is assay by titrating with

A. KMnO4

B. NaOH

C. Na2S2O7

D. HCl

Ans. C

48.The common name of sodium hypochloride is

A. Epsam salt

B. Dakin's solution

C. Lugol's solution

D. Maddrell's salt

Ans.B

49.Silicon carbide rod heated to a high temperature is used as a

A. Detector in infra red spectroscopy

B. Source of light in infra red spectroscopy

C. Source of light flurimetry

D. Detector in gas chromatography

Ans. B

50.Disodium edetate chelates with many di-, tri-, and tetravalent cations to form complexes containing strainless

A.Cyclohexane rings

B. Cyclooentane rings

C. Aromatic rings

D. Cycloheptane rings

Ans. B

51.N/10 Iodine in the presence of water is used in a variety of volumetric determination and it acts as a

A. Mild oxidizing agent

B. Strong oxidizing agent

C. Reducing agent

D. Neutralizing agent

Ans. A

52.Titanium dioxide is commonly present in

A. Vanishing cream

B. Sunscreen cream

C. Aqueous calamine cream

D. Ophthalmic cream

Ans. B

53.Silver salts, in absence of interfering substances, can be determined by direct titration with ammonium thiocyanate in the presence of

A. HCl

B. H2SO4

C. AcOH

D. HNO3

Ans. D

54.Thiioentone is a sulohur analogue of pentobarbitone which is synthesized by condensing ethyl-I-methylbutylmalonate with

A. Urea

B. Methyl urea

C. Thiourea

D. Ethyl malonate

Ans. C

55.A metal ion-sensitive indicator is used to detect changes of

A. pH

B. Acidity

C. Basicity

D. pM

Ans. D