Chemical Sciences_Part-2_FACT 2018_Previous Year Question Paper

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Q 36. Which gas was responsible for mass killing in Bhopal tragedy ? 

A. Hydrogen sulphide

B. Sulphur dioxide 

C. Methyl isocyanate 

D. Mustard gas 

ANSWER: C

Q 37. Most suitable technique for detection of adulteration of petrol with kerosene is 

A. HPLC

B. UV spectrophotometer

C. ICP

D. Gas Liquid Chromatography 

ANSWER: D

Q 38. When the NDPS Act came in to force ? 

A. 1985

B. 1980

C. 1984

D. 1945

ANSWER: A

Q 39. What is the Octane Number of Iso-octane ? 

A. 91

B. 93

C. 100

D. 98

ANSWER: C

Q 40. SE-30 column of Gas chromatography has stationary phase of 

A. Phenyl silicone

B. Methyl silicone

C. Polyethylene glycol

D. Silica 

ANSWER: B

Q 41. Antidote for organophasphorus pesticide is 

A. Atropine

B. Strychnine

C. Amphetamine

D. Pethidine 

ANSWER: A

Q 42. In which technique generally separate Cathode lamp is required for each element 

A. ICP

B. ICP-MS 

C. AAS

D. ICP-OES 

ANSWER: C

Q 43. Frequency corresponding to 500 nm is equivalent to

A. 6x10^(14) Cycles per Sec

B. 5x10^(3) Cycles per Sec

C. 2x10^(12) Cycles per Sec

D. 5x10^(16) Cycles per Sec

ANSWER: A

Q 44. Impure camphor is purified by 

A. Filteration

B. Sedimentation

C. Sublimation

D. Steam distillation 

ANSWER: C

Q 45. Bathochromic shift is also known as 

A. Blue shift

B. Black shift

C. White shift

D. Red shift 

ANSWER: D

Explanation

Bathochromic shift is a change of spectral band position in the absorption, reflectance, transmittance, or emission spectrum of a molecule to a longer wavelength (lower frequency).

Q 46. Purity of a compound can be decided by 

A. Density

B. Melting point

C. Dielectic Constant 

D. Molarity

ANSWER: B

Q 47. In UV-spectrophotometric study the cuvette is made of 

A. Glass

B. Quartz 

C. Sodium chloride

A. Mixture of glass and quartz 

ANSWER: B

Explanation

Cuvettes are small rectangular glass or quartz containers. They are often designed so that the light beam travels a distance of 1 cm through the contents, but the path length can vary from 1 or 2 mm all the way up to 10 cm. 

Types of cuvettes & their Transmission

1. Optical Glass(340 - 2,500 nm)
2. UV Quartz(190 - 2,500 nm)
3. IR Quartz(220 - 3,500 nm )
4. Sapphire(250 - 5,000 nm)

Q 48. Which of the following molecule exhibit IR spectra? 

A. Hydrogen

B. Nitrogen

C. Oxygen 

D. Carbon monoxide 

ANSWER: D

Q 49. How many peaks (signals) are obtained for ethyl chloride in NMR? 

A. 2

B. 3

C. 4

D. 5 

ANSWER: A

Explanation

• NMR is an abbreviation for Nuclear Magnetic Resonance. 
• It allows the molecular structure of a material to be analyzed by observing and measuring the interaction of nuclear spins when placed in a powerful magnetic field.
• The principle behind NMR is that many nuclei have spin and all nuclei are electrically charged. 
• If an external magnetic field is applied, an energy transfer is possible between the base energy to a higher energy level (generally a single energy gap).

Q 50. Which rule is common for predicting splitting pattern in NMR 

A. (n+1) rule

B. (2n+1) rule

C. (4n+1) rule

D. (m+n) rule 

ANSWER: A

Q 51. Carbon 12 nuclei is NOT magnetically active because its spin number is

A. 1/ 2 

B. 2 

C. Zero

D. 3/2

ANSWER: C

Explanation

Spin quantum number is a quantum number (designated ms) which describes the intrinsic angular momentum (or spin angular momentum, or simply spin) of an electron or other particle.

Q 52. In NMR common internal reference is 

A. TMS

B. DMS 

C. CMS

D. NMS

ANSWER: A

Explanation

TMS- Tetramethylsilane; because it has a strong, sharp resonance line from its 12 protons, with a chemical shift at low resonance frequency relative to almost all other 1H resonances. Thus, addition of TMS usually does not interfere with other resonances.

Q 53. Which is NOT suitable Hyphenated technique ? 

A. GC-IR

B. LC-MS 

C. GC-MS

D. AAS-LC 

ANSWER: D

Explanation

• Hyphenated technique is the combination or the coupling of the different analytical techniques. 
• Mainly chromatographic techniques are combined with spectroscopic techniques. 
• Then the separated components of the mixture from chromatographic technique will enter into the spectroscopic technique through an interphase.

Q 54. Select the one by which RF value will NOT change by changing 

A. Absorbent nature

B. Polarity of solvent system 

C. Increasing temperature

D. Size of TLC Chamber keeping other factors same

ANSWER: D

Explanation

Rf (retardation factor) value is the ratio of the solute's distance travelled to the solvent's distance travelled.

Q 55. which one is correct for Neutron Activation Analysis ? 

A. Destructive technique

B. Non-destructive technique 

C. Less sensitive technique 

D. used for liquid sample only 

ANSWER: B

Q 56. Retention time in gas chromatography is

A. time taken in injecting sample

B. Time taken by carrier gas to come out of column

C. Time taken to achieve desired temperature of column 

D. Time taken by solute from injection to reach detector

ANSWER: D

Q 57. Power alcohol consist of 

A. Ethanal 99.9 percent

B. Mixture of ethanol and methanol 

C. Mixture of ethanol and petrol 

D. Pure methanol

ANSWER: C

Explanation

• Power alcohol is called Ethyl alcohol as it is used to generate power. 
• It is also used as an additive to motor fuels to act as fuel for internal combustion engine. 
• The mixture has generally 80% petrol and 20% alcohol.

Q 58. For testing lead which reagent is used 

A. Sodium Rohdizonate

B. Alpha benzoin oxime

C. Alpha Alpha dipyridyl

D. Alizarin Red 

ANSWER: A

Q 59. For testing nitrate in presence of nitrite, the nitrite is removed by 

A. Sulphanilic acid 

B. Sulphuric acid

C. Sulfamic acid 

D. Alpha naphthyl amine

ANSWER: C

Q 60. Select the one which belongs to benzodiazepine group ? 

A. Zolpidem 

B. Ketamine 

C. Pethidine 

D. Clonazepam

ANSWER: D

Explanation

• Benzodiazepines are a group of drugs called nervous system depressants. People may take them to treat anxiety or sleeping issues. Also called "benzos", are a class of psychoactive drugs  whose core chemical structure is the fusion of a benzene ring and a diazepine ring.
• First benzodiazepine, chlordiazepoxide (Librium), was discovered accidentally by Leo Sternbach 
• In 1955 and was made available in 1960 by Hoffmann–La Roche, which soon followed with diazepam (Valium) in 1963.

Types of Benzodiazepines

1. 2-keto compounds:- clorazepate, diazepam, flurazepam, halazepam, prazepam
2. 3-hydroxy compounds:- lorazepam, lormetazepam, oxazepam, temazepam
3. 7-nitro compounds:- clonazepam, flunitrazepam, nimetazepam, nitrazepam
4. Triazolo compounds:- adinazolam, alprazolam, estazolam, triazolam
5. Imidazo compounds:- climazolam, loprazolam, midazolam
6. 1,5-benzodiazepines:- clobazam

Q 61. Standard solution of 5 ppm means 

A. 5 mg per ml 

B. 50 mg per litre 

C. 0.005 mg per ml 

D. 500 mg per litre 

ANSWER: C

Q 62. 10 bar is equal to how many Pascal ? 

A. 10x10^(5)

B. 100x10^(5) 

C. 1x10^(5)

D. 0.01x10^(5)

ANSWER: A

Q 63. Best sample for analysis of alcohol for punishing the person which can stand in the 

Court of law is 

A. Persipiration 

B. Blood 

C. Urine

D. Breath 

ANSWER: B

Q 64. What is the small quantity for Charas as per NDPS Act? 

A. 25 gram 

B. 100 gram

C. 250 gram

D. 10 gram 

ANSWER: B

Q 65. Quaternary ammonium compounds are highly soluble in 

A. Chloroform 

B. Acetone

C. Water

D. Ethyl acetate

ANSWER: C

Explanation

• Quaternary ammonium compounds are widely used as surface disinfectants.
• It is also known as quats, are positively charged polyatomic ions.

Q 66. Metabolite of ethyl alcohol is

A. Formaldehyde 

B. Formic acid

C. Acetaldehyde

D. Acetone 

ANSWER: C

Explanation

• More than 90% of ingested ethanol is metabolized in the body to acetaldehyde and acetate. 
• Ethanol is metabolized in the liver via three distinct enzymatic pathways: alcohol 
• dehydrogenase (ADH), the microsomal ethanol oxidizing system (MEOS) and catalase.

Q 67. Which of the following cause chronic poisoning ? 

A. Potassium Cyanide 

B. DDT

C. Arsenic salt

D. Lead salt 

ANSWER: C

Q 68. Ninhydrine reagent is used for detection of 

A. Secondary amine

B. Quarternary amine

C. Primary amine

D. Tertiary amine

ANSWER: C

Q 69. Which one is NOT Phase 1 metabolic reaction ? 

A. Oxidation 

B. Acetylation

C. Hydrolysis

D. Reduction 

ANSWER: B

Q 70. In case of snake bite poisoning which one is suitable sample for analysis ? 

A. Stomach and its contents

B. Liver

C. Kidney

D. Blood

ANSWER: D

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