RL CHEM 3 Flashcards by Pappu Roy

●The graphite rods in the nuclear reactor: —

convertfast moving neutrons into thermal neutrons

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●The first metal used by man was:—

Copper

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●The hydronium ion is:—

H3O+

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●The most electropositive elements among thefollowing is:—

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●The method that cannot be used for removingpermanent hardness of water is:—

Boiling

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●Zone refining is used for the purification of:—

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●Metal are good conductors, because: —

they containfree electrons

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●Tear gas is:—

Carbonyl Chloride

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●A polymeric substance used to make parachute is:—

Viscose

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●Drinking soda is:—

Acidic

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●The cathode of a lead storage battery is made up of:—

Lead

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●Heat resistant variety of glass is:—

Flint Glass

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●Pasteurization of milk means: —

Heating of milk toabove 620 C

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●Type metal used in printing press is an alloy of: —

lead and antimony

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●Sour taste of Coca Cola is due to the presence of: —

Phosphoric acid

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●Bhopal gas tragedy is associated with leakage of: —

Methyl Isocyanate

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●Iodized salt is beneficial for:—

Thyroid function

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●The acid rain destroys vegetations because itcontains: —

Sulphuric acid

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●Diamonds are glittering and attractive because lightincident on them undergoes:—

multiple internalreflections

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●The substance most commonly used as a foodpreservative is:—

Sodium salt of benzoic acid

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●The acid used in lead storage cells is:—

Sulphuricacid

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●Alum stops bleeding in minor cuts because of:—

Coagulation

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●Plaster of Paris is made by partial dehydration of: —

Gypsum salt

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●Water can be separated from alcohol water mixtureby: —

Distillation

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●Hydrogen is not found in atmosphere because: —

It isthe lightest gas

●A substance which readily forms colloidal solution incontact with water is called:—

Hydrophilic acid

●When formaldehyde and potassium hydroxide areheated, we get:—

Methyl alcohol

●When conc H2S04 is added to dry KN03, brownfumes are evolved. These fumes are due to:—

NO2

The luster of the metals is because of : —

reflection oflight due to the presence of free electrons

●The major harmful gas emitted by automobilevehicles which causes air pollution is:—

CarbonMonoxide

●Pasteurization is the process in which milk is heatedto:—

630 C for 20 minutes

●The freezer in a refrigerator is fitted near the topbecause:—

it facilitates convection currents

●The most abundant inert gas in the atmosphere is: —

Argon

●Percentage of lead in lead pencils is:—

●Water is not effective in extinguishing a fire causedby petrol because: —

water and petrol areimmiscible with each other and petrol whichforms the upper layer continues to burn

●Helium gas is used in gas balloons instead ofhydrogen gas because it is:—

Non-combustible

●The gas used in the artificial ripening of fruits is: —

Acetylene

●Ruby and Sapphire are oxides of:—

Aluminium

●Gunpowder consists of a mixture of: —

Niter,Sulphur and Charcoal

●In nuclear reactors, graphite is used as a/an:—

Moderator

●The compound to which H2 does not add is: —

Tetraphenyl ethylene

●Ammonal is a mixture of:—

aluminium powder andammonium nitrate

●Which gas does not form the part of atmosphere?—

Chlorine

●The fuel used in an atomic reactor is:—

Uranium

●The major constituent of Gobar gas is:—

Methane

●The residue left after extracting juice from sugarbeetand sugarcane is called:—

Bagasse

●The isotope of Uranium used in atomic reactors is:—

U235

●The greenhouse effect is caused by the higher level ofwhich gas in the atmosphere?—

Carbon dioxide

●Ethanol containing 5% water is known as: —

Rectified spirit

●The amount of chlorine available in water afterdisinfection is called as:—

Residual chlorine

●What are the major pollutants of Cigarette smoke?—

Carbon monoxide and Nicotine

●Nuclear energy is a mineral-based energy source. It isderived from:—

Uranium, thorium andPlutonium

●Zinc sulphide is commonly used as:—

Rodenticide

●Aspirin is chemically known as:—

Acetylsalicylic acid

●The most abundant element in the human body is: —

Oxygen

●Wax used for making candle is chemically a mixtureof: —

Aliphatic hydrocarbons

●Litmus is obtained from:—

lichen

●Vinegar made by fermentation from cane sugarcontains: —

Acetic acid

●Photo-oxidation process is initiated by:—

Light

●Ultraviolet radiation striking the earth is due to thedepletion of:—

Ozone

●Major gaseous pollutant of the thermal power stationis: —

SO2

●The process of removing calcium and magnesiumfrom hard water is known as:—

Water softening

●The tip of the match-stick contains:—

Redphosphorus

●Commercially, sodium bicarbonate is known as: —

Baking soda

●An emulsifier is an agent which:—

stabilizes asemulsion

●Mortar is a mixture of water, sand and:—

Slakedlime

●The National Chemical Laboratory (India) is locatedin: —

Pune

●One of the constituents of tear gas is:—

Chloropicrin

●An atomic clock is based on transitions in:—

Caesium

●Silver halides are used in photographic plates becausethey are:—

reduced by light

●Tetra ethyle lead (TEL) is:—

An antiknockcompound

●The material used in the manufacture of lead pencilis: —

Graphite

●If all bullets could not be removed from gunshotinjury of a man, it may cause poisoning by:—

Lead

●German silver, an alloy, does not contain the metal:—

Silver

●Oxygen which is vital for life is a product ofphotosynthesis and comes from:—

Carbon dioxide

●The noble gas used in radiotherapy is:—

Radon

●Steel contains:—

0.1 to 2 % carbon

●The chemical(s) most commonly used for cloudseeding or 'artificial rainmaking' is/are:—

SilverIodide

●White phosphorus is always kept under:—

Water

●Galena is a mineral of:—

Lead

●Magnalium is an alloy of:—

Aluminium andMagnesium

●Dry powder fire extinguishers contain:—

Sand andSodium bicarbonate

●Which type of glass is used for making glassreinforced plastic?—

Fibre Glass

●Two elements which are used to absorb neutrons tocontrol the chain reaction during nuclear fissionare:—

Boron and Cadmium

●The most commonly used chemicals in the artificialrainmaking or cloud seeding are:—

Silver Iodide

●Hydrogen bomb is based on the principle of: —

Uncontrolled fusion reaction

●Supersonic jet causes pollution by thinning of:—

O3layer

●Which of the following metals causes Itai-Itaidisease? —

Cadmium

●Glycol is added to aviation gasoline because it: —

prevents freezing of petrol

●Which one of the following minerals is found inMonazite sand?—

Thorium

●Now a days, yellow lamps are frequently used asstreet lights. Which gas is used in these lamps?—

Sodium

●The addition of gypsum to Portland cement helps in:—

preventing rapid setting of cement

●The constituents of automobile exhaust that can causecancer is/are:—

Lead

●Hard steel contains:—

0.5 to 1.5 % Carbon

●Cement is formed by strongly heating a mixture of:—

Limestone and clay

●The temperature of oxyacetylene flame is around: —

32000 C

●The Refrigerant 'FREON' is: —

Difluoro DichloroMethane

●Raw materials used for the manufacture of glass are:—

Sand, soda and limestone

●The BOD values of water indicate the: —

amount ofoxygen used for biochemical oxidation

●Bleaching powder is used in drinking water as a/an:—

Disinfectant

●The iron ore which contains 72% of iron is:—

Magnetite

●The atmospheric gas that is mainly responsible GreenHouse effect:—

Carbon dioxide

●Electric bulbs are filled with:—

Argon

●The purest form of Iron is:—

Wrought Iron

●Non-stick kitchenware are coated with:—

Teflon

●Sea weeds are important source of:—

Iodine

●The fiber least prone to catch fire is:—

Cotton

●The common name for the compound having formatNaOH is:—

Caustic Soda

●Bone ash contains:—

Calcium phosphate

●Slag is a name given for:—

molten alumina

●An example of replenishable energy source is:—

Biomass

●Tar roads get damaged if there is:—

Stagnation ofwater on road

●The drug 'Marijuana' is a:—

Sedative

●The material known in commerce as Terylene is a: —

Synthetic fibre

●The chemical used in embalming biological materialsis: —

Formaldehyde in water

●Sodium bicarbonate is commercially known as: —

Baking Soda

●Coal is formed from:—

compressed and hardenedbiomass

●Commercial Vaseline is derived from:—

Petroleum

●Colour imparted to the Bunsen flame by strontiumsalt is: —

Crimson Red

●A potato tuber has been cut into two halves. A fewdrops of iodine solution are placed on the cutsurface of one of the halves. What colour changewill be noticed?—

From brown to blue-black

●Tear gas used by the police to disperse the mobcontains:—

Chlorine

Epsom salt is used:—

in making tooth paste

●The chemical name of rat poison is:—

ZincPhosphide

●The gas which is mainly responsible for the greenhouse effect is:—

Carbon dioxide

●Domestic Cooking gas consists mostly of:—

Liquefiedbutane and isobutene

●Quick Silver is chemically known as:—

Mercury

●Extensively used nitrogenous fertilizer is:—

Urea

●Which particle moves around the nucleus of an atomand are negatively charged?—

Electrons

●Hardest allotrope of carbon is:—

Diamond

●Name the particle that is most essential to continuethe chain reaction during the fission of uranium.—

Neutron

●Conversion of chemical energy into electrical energyoccurs in: —

A battery

●The fuel that is used in modern submarines is: —

Nuclear Fuel

●The basic chemical building block of natural rubberobtained from trees is:—

Isoprene

●The name of plastic polymer from which combs, toys,bowls, etc., can be made is:—

Polystyrene

●Which metal does not undergo corrosion due to theformation of oxide layer?—

Aluminium

●Molasses, a by-product in the manufacture of sugar,is converted into:—

Alcohol

●Silver nitrate solution is kept in brown bottles inlaboratory because:—

Brown bottles stop thepassage of light through it

●Gelatin is mostly used in making ice-creams in orderto: —

Stabilize the colloid and preventcrystallization

●Two elements which can form a large number ofcompounds are:—

Carbon and Hydrogen

●An inert gas mixed with oxygen given to patientssuffering from restricted breathing is:—

Helium

●The fungus which is used in the alcohol industry is:—

Yeast

●Gold dissolves in:—

Aqua-regia

●Which halide is used in making sensitive emulsion onphotographic film?—

Silver Bromide

●The material used in solar cells contains:—

Silicon

●When lime juice is dropped on baking soda, briskeffervescence takes place because the gas evolvedis:—

Carbon dioxide

●In the electroplating of gold, the electrolyte used is:—

Gold Sulphate

●The acid present in red ants is:—

Formic acid

●The metal extracted from Bauxite is:—

Aluminium

●pH value between 6.5-7.5 makes the soil:—

Basic

●The wire of flash bulb is made of:—

Magnesium

●The coloured discharge tubes for advertisementmainly contains:—

Neon

●Muscle fatigue is caused by the accumulation of: —

Lactic acid

●When quick lime is added to water:—

heat isliberated

●The number of neutrons present in an element havingmass number 226 and atomic number 88 is:—

138

●The natural resource, known as black gold, is:—

Coal

●This group of alumino-silicate minerals is widely usedin making electric insulators. Which is it?—

Mica

●Dry Ice is:—

Solid Carbon dioxide

●Cement containing excess amount of lime: —

cracksduring setting

●Which of the following is a micro-element?—

Chlorine

●Rock salt is a mineral containing:—

Sodium

●In a nuclear reactor, the material use for absorbingneutrons is:—

Cadmium

●Solder metal is an alloy of:—

Lead and Tin

●Copper is refined by:—

Roasting

●The element with highest first ionization energy is: —

Helium

●An atom of an element has atomic number 17 andmass number 36. The number of neutrons in itsnucleus is:—

●Seaweeds are important source of:—

Iodine

The resources which can be used continuously, year-after-year are called:—

Renewable resources

●Refrigerators keep food unspoiled because: —

at itslow temperature, bacteria and moulds are inactive

●When Hydrogen starts burning in air, it produces: —

Water

●Spirit in contact with body gives cool sensationbecause it is: —

Highly volatile

●Taj Mahal is greatly affected due to:—

Acid Rain

●The unit of ionic product of water (Kw) is:—

Mol2let-2

●What is the chemical name of bleaching powder? —

Calcium hypochlorite

●Alcoholic (—OH) group can be identified by:—

FeCl3Test

●Pollutant from motor car exhaust that causes mentaldisease is:—

Lead

●The total energy of revolving electron in an atom: —

can never be positive

●Conduction band electrons have more mobility thanholes because they:—

experience collision lessfrequently

●Iodine can be separated from a mixture of Iodine andPotassium Chloride by:—

Sublimation

●Identify the metal which is non-toxic in nature.—

Gold

●The gas that usually causes explosion in coal mines is:—

Methane

●The chemical behavior of an atom depends upon: —

the number of electrons orbiting around thenucleus

●A powerful eye irritant present in smog is: —

Peroxyacetyl nitrate

●The most important ore of lead is:—

Galena

●When water itself combines chemically with someelement or mineral it is called:—

Hydration

●The electronic configuration of an atom havingatomic number '20' is:—

2, 8, 8, 2

●The most reactive among the halogens is:—

Fluorine

●KMnO4 can be used as a:—

Disinfectant

●Electrolysis of an aqueous solution of copper sulphateusing copper electrodes gives: —

Copper atcathode and oxygen at anode

●Which inert gase can form compounds?—

Xenon

●Burning pyrites ore gives out:—

Sulphur dioxide gas

●Oxygen has (+) oxidation number only in:—

OF2

●The particle required to continue the chain process ofUranium fission is:—

Neutron

●The chief source for the production of nitrogenousfertilizers is:—

Ammonia

●The element used for making solar cells is:—

Silicon

●Bakelite is a co-polymer of Phenol and:—

Formaldehyde

●When a spoon is to be electroplated with nickel, thespoon is:—

made cathode and a pure nickel red,the anode

●Wood spirit is:—

Methyl alcohol

●Fire fighting clothes are made of:—

Asbestos

●Water gas is the mixture of:—

Carbon monoxide andhydrogen

●Which type of fire extinguisher is used for petroleumfire? —

Foam type

●The function of skimming tank in sewage treatment isto remove:—

Oil and fatty substances

●Black lung disease occurs in people working in:—

Coal mines

●The chief source of naphthalene is:—

Coal tar

●Why water is not suitable for putting out a petrolfire?—

Water, being heavy, slips below petrolwhich thus remains in contact with air and burns

●Milk is:—

Emulsion

●The chemical substance present in bones and teeth is:—

Calcium phosphate

●Maximum permissible concentration of copper indrinking water in mg/L is:—

1.0

●If lime water is kept in the air, it turns milky due tothe presence of:—

Carbon dioxide

●Heavy metal pollution of water is caused by:—

Paints

●The inert gas which is substituted for nitrogen in theair used by deep sea divers for breathing is:—

Helium

●One carat of diamond is equal to—

200 m

The process by which milk is converted to curd iscalled: —

Fermentation

●The technique of calculating the age of fossilorganisms is: —

Radiocarbon dating

●Nitrogen forms a variety of compounds in alloxidation states ranging from:—

3 to +3

●The next higher homologue of C6H14 is:—

C7H16

●The chemical used as a 'fixer' in photography is: —

Sodium thiosulphate

●Yellow Cake, an item of smuggling across border, is:—

Uranium Oxide

●The difference between a nuclear reactor and anatomic bomb is that: —

The chain reaction innuclear reactor is controlled

●Physic-chemical characteristics of water in watersources undergo changes due to:—

Effluents

●The alpha particle carries two positive charge. Itsmass is very nearly equal to that of:—

An atom ofhelium

●The offending substance in the liquor tragediesleading to blindness is:—

Methyl alcohol

●The characteristic odour of garlic is due to:—

Asulphur compound

●The most reactive among the halogens is:—

Fluorine

●The water pollution in rivers is measured by thedissolved amount of:—

Oxygen

●Coke is one of the materials of the charge added toblast furnace for the production of steel/iron. Itsfunction is to:—

act as the reducing agent

●In the production of steel/iron, what is the function ofcoke?—

To function as a fuel, supply heat

●Barium in a suitable form is administered to patientsbefore and X-Ray examination of the stomach,because:—

It is a good absorber of X-Rays andthis helps the stomach to appear clearly incontrast with the other regions in the picture

●Cobalt-60 is commonly used in radiation therapybecause it emits:—

Gamma Rays

●The correct statement is:—

To dilute sulphuric acid,acid is added to water and not water to acid.

●Large cold storage plants use ____ as refrigerant,while domestic refrigerators usechlorofluorocarbons.—

Ammonia

●Most of the explosions in mines occur due to themixing of: —

oxygen with acetylene

●Aluminium surface are often 'anodized.' This meansthe deposition of a layer of:—

Zinc oxide

●Hard water is not suitable for:—

washing clotheswith soap

●In an atom, the order of filling up of the orbital isgoverned by: —

Aufbau's Principle

●An aqueous solution of copper sulphate is acidic innature because the salt undergoes:—

Hydrolysis

●In a group of elements, what decreases as the atomicweight increases?—

Electron affinity

●In a given period, what gradually increases along aperiod? —

Ionization Potential

●A radioactive substance has a half-life of fourmonths. Three-fourth of the substance woulddecay in:—

8 months

●If we sprinkle common salt on an earthworm, it diesdue to: —

osmotic shock

●Endosulfan, which has been in news these days, is a:—

Pesticide

●Gypsum is added to clinker during cementmanufacturing to: —

decrease the rate of settingof cement

●The main chemical constituent of the oil ofcardamom which is responsible for flavour of thisoil is:—

Cineole

●The molecule which has the highest percentage ofionic character among the following is:—

●The high reactivity of fluorine is due to: —

its highelectro negativity

●The iron ore magnetite consists of:—

Fe2O3

●The main chemical constituent of clay is:—

aluminium silicate

●The mineral containing both magnesium and calciumis: —

Dolomite

The metal does not give H2 on treatment with diluteHCl is: —

●The number of g-molecule of oxygen in 6.02 x 1024CO molecules is:—

5 gram of molecule

●The most extensive, commercially useful source ofthorium as monazite sand occurs in India at:—

Travancore Coast

●The main active constituent of tea and coffee is:—

Caffeine

●The maximum number of isomers for an alkene withmolecular formula C4H8 is:—

●The organic reaction represented by equation CH3 -CH = O + H2NOH gives CH3 - CH - NH + H2O isan example of:—

a condensation reaction

●The hottest part of the gas flame is known as: —

non-luminous zone

●The human body is made up of several chemicalelements; the element present in the highestproportion (65%) in the body is: —

Oxygen

●The isomerism which exists between CH3CHCI2 andCH2CI.CH2 CI is:—

positional isomerism

●The half life period of an isotope is 2 hours. After 6hours what fraction of the initial quantity of theisotope will be left behind? —

1/8

●The number of waves made by an electron moving inan orbit having maximum magnetic quantumnumber is +3:—

●The number of atoms present in 21.6 gram of silver(atomic weight = 108) are same as the moleculesin:—

12 moles of KMnO4

●Equal masses of oxygen, hydrogen and methane arekept under identical conditions. The ratio of thevolumes of gases will be:—

1 : 16 : 2

●The mass number of an atom is equal to: —

thenumber of nucleons

●The maximum number of covalent formed bynitrogen is:—

●The formula C6H5-CO-CH3 represents:—

Acetophenone

●The method of concentrating the ore which makesuse of the difference in density between ore andimpurities is called:—

Levigation

●The inert gases are ____ in water.—

Sparingly soluble

●The molecular formula of phosphorous is:—

●The names of the scientists, Newlands, Mendeleev,and Meyer are associated with the developmentof: —

periodic table of elements

RL CHEM 3 Flashcards

(267 cards)