Chemical Sciences_Part-1_FACT 2018_Previous Year Question Paper

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Q 1. Main constituents of German silver are

A. Copper and zinc

B. Copper and silver

C. Silver and zinc

D. Copper, zinc and nickel 

ANSWER: D

Explanation

• Copper and zinc:- Brass
• Copper and silver:- Sterling (92.5% silver and 7.5%copper)
• Copper, zinc and nickel:- German Silver

Q 2. Pitch-blende is a source of which metal

A. Silver

B. Copper

C. Uranium

D. Palladium 

ANSWER: C 

Explanation

Pitch-blende:- Brown to black mineral that consists of massive uraninite, has a distinctive luster, contains radium, and is the chief ore-mineral source of uranium.

Q 3. Alcoholic drinks are covered under which Act?

A. NDPS Act

B. Drug and Cosmetic Act

C. Excise Act

D. Essential Commodity Act 

ANSWER: C 

Explanation

• NDPS ACT, 1985:- NARCOTIC DRUGS AND PSYCHOTROPIC SUBSTANCES; prohibits a person the production/manufacturing/cultivation, possession, sale, purchasing, transport, storage, and/or consumption of any narcotic drug or psychotropic substance. Narcotics Control Bureau was set up under the act with effect from March 1986.
• DRUGS AND COSMETICS ACT, 1940:- regulate import, manufacture, distribution and sale of Drugs and Cosmetics
• Excise Act 1958:- An Act to consolidate and amend the Excise Law of the Jammu and Kashmir State. Whereas it is expedient to consolidate and amend the law relating to the. import, export, transport, manufacture, sale and possession of intoxicating liquor.
• Central Excise Act, 1944:- to ensure that laws concerning the Central Duties of Excise on any goods or products manufactured within the length and breadth of India, could be consolidated as well as amended by the Central Government.
• Essential Commodity Act, 1955:- In the interest of the general public, for the control of the production, supply and distribution of, and trade and commerce, in certain commodities. To essentially protect consumers from unreasonable and exploitative increases in prices of commodities in times of shortage, has been amended several times over the years, and made more stringent.

Q 4. Which of the following test is used for testing methanol?

A. Iodoform test

B. Fujiwara test

C. Chromotropic acid test

D. Legals test 

ANSWER: C 

Explanation

Test for Ethanol (Ethyl Alcohol)

1. Iodoform Test

2. Dichromate Test

3. Sulphomolybdic Test

Test for Methanol (Methyl Alcohol)

1. Chromotropic Acid Test

2. Schiff’s Reagent Test

3. Isopropanol (Isopropyl Alcohol)

Q 5. Which poison is extracted by steam distillation?

A. Atropine

B. Nicotine

C. Cocaine

D. Strychnine 

ANSWER: B 

Explanation

Steam distillation:- A separation process used to purify or isolate temperature-sensitive materials, such as natural aromatic compounds.

Extraction of poisons by this method:- Nicotine, amphetamine, ephedrine, erkdine, ethanol, acetaldehyde, formaldehyde, methanol, acetone, pyridine, phenol, benzene, terpine oil, carbon tetrachloride.

Q 6. Ethyl mercaptan is used in

A. Petrol

B. LPG

C. Kerosene

D. Naphtha 

ANSWER: B 

Explanation

Ethyl Mercaptan:- A colorless or yellowish liquid or a gas with a pungent, garlic or skunk-like odor. It is used as an additive to odorless gases like butane, propane, and petroleum products to give them a warning odor.

Q 7. Final boiling point of kerosene in the distillation test method as per Bureau of Indian Standard is

A. Maximum 300 degree C

B. Maximum 320 degree C

C. Maximum 340 degree C

D. Maximum 360 degree C 

ANSWER: A

Q 8. To develop pink colour of phenolphthalein in trap cases which alkali is used?

A. Sodium bicarbonate

B. Ammonium hydroxide

C. Sodium carbonate

D. calcium hydroxide

ANSWER: C

Q 9. IED stands for

A. Imported Explosive Device

B. Improvised Explosive Device

C. Improved Explosive Device

D. Indian Explosive Device 

ANSWER: B

Q 10. Explosive range for gasoline is

A. 1.4 - 7.6 percent

B. 7.6 - 10.0 percent

C. 1.0-1.4 percent

D. 10.0 - 11.4 percent 

ANSWER: A

Q 11. Major constituent of IMFL

A. Ethyl alcohol

B. Water

C. Methyl alcohol

D. Acetone 

ANSWER: B

Explanation

Indian-made foreign liquor (IMFL):- The official term used by governments, businesses and media in India to refer to all types of hard liquor manufactured in the country other than indigenous alcoholic beverages such as feni, toddy, arrack and others. 

Mostly made of molasses(thick, dark brown juice obtained from raw sugar during the refining process), not grains, not aged and only an approximation of the original, achieved by adding artificial flavours and coloring, such as caramel

Q 12. Most appropriate container for packing in arson cases is

A. Cloth packing

B. Polythene bag

C. Tin box

D. Plastic box 

ANSWER: C 

Q 13. Which dye belong to azo-dye group

A. Methyl orange

B. Malachite green

C. Eosin

D. Phenolphthalein 

ANSWER: A 

Explanation

Azo dyes:- largest group of artificial food dyes, including 70% of the organic dyes generated in the world.

Common azo dyes in the food industry, yellow dyes (sunset yellow and tartrazine) and red dyes (azorubine, ponceau, amaranth, and allura red).

Q 14. Which of the following pesticide is rodenticide?

A. Lindane

B. Earbaryl

C. Allethrin

D. Thallium salt 

ANSWER: D 

Explanation

Rodenticide:- Poisons used to kill rats. Examples are bromethalin, cholecalciferol, zinc phosphide, thallium salt, strychnine.

Q 15. What is the approximate normality of 96% sulphuric acid having specific gravity 1.84?

A. 17

B. 36

C. 11

D. 38 

ANSWER: B

Explanation

Normality=(specific gravity)(% purity in decimal)1000/equivalent weight Here specific gravity=1.84 %purity in decimal=0.96 Equivalent mass of H2SO4=49.03 So Normality=(1.84)(0.96)(1000)/49.03=36

Q 16. Which of the following is NOT high explosive?

A. Dynamite

B. Black powder

C. PETN

D. Lead azide 

ANSWER: B

High explosives:- explosive materials that can be caused to detonate by means of a blasting cap. A few examples of high explosives would be boosters, detonators, dynamite, water gels/slurries, and emulsions. Most powerful explosive chemical is PETN.

Q 17. One of the colour test used for explosive is

A. Furfural reagent

B. Acetaldehyde reagent

C. Diphenylamine reagent

D. Potassium chromate 

ANSWER: C

Q 18. Deadly night shade plant refers to

A. Strychnos nux vomica

B. Cannabis sativa

C. Atropa Belladona

D. Abrus precatorious 

ANSWER: C 

Explanation

Q 19. Kif' is known for

A. Cocaine

B. Cannabis

C. Heroin

D. Amphetamine 

ANSWER: B

Q 20. Duquenois Levine test is a valuable test for testing

A. Opuim and its derivatives

B. Coca plant

C. Mushroom

D. Cannabis 

ANSWER: D

Q 21. Which of the following instrumental techniques does NOT give specific identification of drugs?

A. UV-visible spectrophotometry

B. GC-Mass

C. FTIR

D. Raman spectroscopy 

ANSWER: A

Q 22. Which of the chemical is used for manufacturing of heroin from morphine?

A. Sodium chloride

B. Acetaldehyde

C. Acetic anhydride

D. Malonic acid 

ANSWER: C

Q 23. Porapak column in GLC is most suitable for analysis of

A. Alcohols

B. Hydrocarbons

C. Polymers

D. Alkaloids 

ANSWER: A 

Explanation

• Porapak Q (ethylvinylbenzene-divinylbenzene polymer) is a substance used to pack the column in gas chromatography (GC).
• The Porapak Q column method (PQM) was recently developed to concentrate volatile components in foods.

Q 24. Scientist Egon Stahl is related to

A. Gas chromatography

B. Spectrophotometry

C. HPCL

D. Thin layer chromatography 

ANSWER: D

Q 25. Retention Index is related to which instrumental technique ?

A. UV-visible spectrophotometry

B. FTIR

C. Gas chromatography

D. SEM 

ANSWER: C 

Explanation

• Retention indices (RIs) are widely used in gas chromatography (GC) to support the identification of unknown compounds Additional fact
• Carrier gas is an inert gas used to carry samples. Helium (He), nitrogen (N2), hydrogen (H2), and argon (Ar) are often used. Helium and nitrogen are most commonly used and the use of helium is desirable when using a capillary column

Q 26. Nitro group is present in which of the following pesticides?

A. Malathion

B. Parathion

C. Baygon

D. Cypermethrine 

ANSWER: B 

Explanation

Q 27. In elutropic series the solvents are arranged in increasing order of

A. Boiling point

B. Molecular weight

C. Dielectric constant

D. Viscosity 

ANSWER: C 

Explanation

Eluotropic series

Listing of various compounds in order of eluting power for a given adsorbent. The "eluting power" of a solvent is largely a measure of how well the solvent can "pull" an analyte off the adsorbent to which it is attached.

Q 28. Mayers reagent is NOT used for detecting

A. Opium alkaloid

B. Atropine

C. Benzodiazepine

D. Cocaine 

ANSWER: C 

Explanation

• Mayer's reagent also called potassiomercuric iodide solution.
• It is an alkaloidal precipitating reagent used for the detection of alkaloids in natural products.
• It is freshly prepared by dissolving a mixture of mercuric chloride (1.36 g) and of potassium iodide (5.00 g) in water (100.0 ml).
• This test was invented by the German Chemist, Julius Robert Von Mayer (1814–1878).

Q 29. In the mixture containing codeine and thebaine by which technique each can be identified?

A. Colour test

B. UV-spectrophotometry

C. GC-Mass

D. Mass spectrometry 

ANSWER: C

Q 30. Which of the solvent cannot be used in preparation of sample for UV spectrophotometric study?

A. Ethanol

B. Water

C. Benzene

D. Cyclohexane 

ANSWER: C 

Explanation

UV-Visible spectroscopy

Deals with the study of the electronic transitions of molecules as they absorb light in the UV (190-400 nm) and visible regions (400-800 nm) of the electromagnetic spectrum.

The energetically favored electron promotion will be from the highest occupied molecular orbital (HOMO) to the lowest unoccupied molecular orbital (LUMO).

The wavelengths at which absorption occurs, together with the degree of absorption at each wavelength is recorded by optical spectrometer.

A spectrum is obtained as a result. It commonly provides the knowledge about π-electron systems, conjugated systems, aromatic compounds and conjugated non-bonding electron systems etc.

Q 31. E (1%) value means

A. Emission of light by 1% solution

B. Absorption of light by 1% solution

C. Reflecance of light by 1% solution

D. Scattering of light by 1% solution 

ANSWER: B

Q 32. Which of the following poisons contain Strychnine ?

A. Nux vomica

B. Aconite

C. Dhatura

D. Cannabis 

ANSWER: A

Q 33. 2.50 micrometer is equivalent to

A. 3000 Cm^(-1)

B. 4000 Cm^(-1)

C. 2500 Cm^(-1)

D. 2000 Cm^(-1) 

ANSWER: B

Q 34. Source of radiation in UV spectrophotometer is

A. Nichrome wire

B. Tungsten lamp

C. Deuterium lamp

D. Mercury lamp 

ANSWER: C

Q 35. Normal phase in HPLC means

A. Polar stationary phase and non polar mobile phase

B. Polar Stationary phase and polar mobile phase

C. Non Polar stationary phase and more polar mobile phase

D. Non Polar stationary phase and non polar mobile phase 

ANSWER: A

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