Basic Chemistry Questions with Answers:
The pressure of the atmosphere is….mm of mercury at sea level.
(a) 76
(b) 650
(c) 760
(d) 630
Nitrogen is used to fill electric bulbs. This is because
(a) It is easily available
(b) It prevents oxidation of the filament
(c) It is an active gas
(d) It is the most abundant gas.
Sulfuric acid is also known as
(a) Oil of Vitriol
(b) Blue Vitriol
(c) Water Vitriol
(d) Acid Vitriol
__ was the first organic compound to be synthesized in laboratory from non-living sources
(a) Etahne
(b) Alcohol
(c) Ether
(d) Urea
Which of the following are isomers?
(a) Ethane and Propane
(b) Methane & Met bene
(c) Propane & Propene
(d) Butane and Isobutane
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Nitrogen is used in food packing, because:
(a) It is cheap
(b) It is not combustible
(c) Its unreactive nature helps in keeping food fresh
(d) It is most reactive.
The layer of atmosphere that is important for radio communications is
(a) Exosphere
(b) Troposphere
(c) Stratosphere
(d) Ionosphere
Sulfur is not present in
(a) iron pyrites
(b) gypsum
(c) coal
(d) chlorapatite
A substance which is a solid or liquid under ordinary conditions but gas under special conditions is called
(a) Vapor
(b) Liquid
(c) Solid
(d) Element
Which gas is used in atomic research and radiotherapy?
(a) Neon
(b) Radon
(c) Propane
(d) Xenon
The most important ore of Aluminum is —
(a) Bauxite
(b) Calamine
(c) Calcite
(d) Galena
Which expression is correct for the work done on adiabatic reversible expansion of an ideal gas
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An alloy used in making heating elements for electric heating devices is —
(a) Solder
(b) Alloysteel
(c) Nichrome
(d) German Silver
A Beaufort scale has numbers ranging from
(a) 12 to 1
(b) 1 to 12
(c) 1 to 10
(d) 10 to 1
__ is also known as Marsh gas
(a) Ethylene
(b) Acetylene
(c) Ethane
(d) Methane
How does common salt help in separating soap from the solution after saponification?
(a) By decreasing the density of soap
(b) By decreasing solubility of Soap
(c) By increasing the density of soap
(d) By increasing the solubility of soap
Which of the following is NOT a chemical change?
(a) Conversion of carbohydrate to energy
(b) Converting water into steam
(c) Making curd from milk
(d) Heating coal
For reaction 2A + B 
products, the active mass of B is kept constant and that of A is doubled. The rate of reaction will then
(a) Increase 2 times
(b) Increase 4 times
(c) Decrease 2 times
(d) Decrease 4 times
A piece of card – board is an example of:
(a) Transparent substance
(b) Opaque substance
(c) Semi-transparent substance
(d) None
German Silver is an alloy of —
(a) Copper, Silver & Nickel
(b) Silver, Copper & Aluminum
(c) Zinc, Copper & Nickel
(d) Silver, Zinc & Nickel
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We smell the fragrance of flowers and perfumes because,
(a) The gas molecules spread easily.
(b) The gas molecules stay at one place.
(c) The gas molecules have fixed positions.
(d) The gas molecules are compactly arranged.
The substance that loses electrons is called:
(a) oxidizing agent
(b) reducing agent
(c) catalyst
(d) None of these
The basic units of matter are :
(a) Atoms
(b) Molecules
(c) Compounds
PbO2 is
(a) Basic
(b) Acidic
(c) Neutral
(d) Amphoteric
Ionization energy is the energy required to remove an ___ from the outermost shell of an isolated gaseous atom
(a) Both electrons and protons
(b) Nuetron
(c) Proton
(d) Electron
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What is the effect of mixing manganese dioixide with hydrogen peroxide?
(a) The manganese dioxide breaks down into manganese and oxygen
(b) The hydrogen peroxide’s bleaching action is accelerated and increased
(c) Nothing
(d) The hydrogen peroxide breaks down into water and oxygen
The element common to all acids is
(a) hydrogen
(b) carbon
(c) sulfur
(d) oxygen
For the above reaction, calculate the weight of oxygen formed when 5.05 g of potassium nitrate decomposes completely.
(a) 0.2 g
(b) 0.4 g
(c) 0.8 g
(d) 1.6 g
In an organic compound, which elements are generally present in addition to hydrogen?
(a) Phosphorus
(b) Sulfur
(c) Nitrogen
(d) Carbon
Balloons are filled with —
(a) Helium
(b) Oxygen
(c) Nitrogen
(d) Argon
In the Fischer-Tropsch synthesis of petrol….. and ….. are used as the raw materials
(a) H2 ; CO
(b) CH4 ; H2
(c) CH4 ; CH3OH
(d) CH3OH ; CO
The charcoal used to decolorize raw sugar is —
(a) Animal charcoal
(b) Sugar charcoal
(c) Cocoanut charcoal
(d) Wood charcoal
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What is gypsum?
(a) Lime
(b) Bleaching powder
(c) Blue vitriol
(d) Ammonium chloride powder
What is the name of the transition from a liquid state directly to a gas of an element or compound?
(a) Ionization
(b) Condensation
(c) Deionization
(d) Vaporization
pH of lemon juice is 4. That means it is
(a) Basic
(b) Acidic
(c) Neutral
(d) None of these
The monovalent ion/radical among the following is :
(a) Calcium
(b) Carbonate
(c) Chromate
(d) Bicarbonate
The gas used to extinguish a fire is —
(a) Neon
(b) Nitrogen
(c) Carbon dioxide
(d) Carbon Monoxide
Arrange NH4+, H2O, H3O+, HF and OH– in increasing order of acidic nature
(a) H3O+ < NH4+ < HF < OH– < H2O
(b) NH4+ < HF < H3O+ < H2O < OH–
(c) OH– < H2O < NH4+ < HF < H3O+
(d) H3O+ > HF > H2O > NH4+ > OH–
Drying oils contains a large proportion of
(a) Cholesterol
(b) Unsaturated fatty acids
(c) Fats
(d) Protein
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In which of the following activities Silicon Carbide is used ?
(a) Making cement and glass
(b) Disinfecting water and ponds
(c) Making castes for statues
(d) Cutting very hard substances
Popular use of which of the following fertilizers increases the acidity of soil?
(a) Ammonium Sulfate
(b) Potassium Nitrate
(c) Urea
(d) Superphosphate of lime
The element common to all acids is —
(a) Oxygen
(b) Hydrogen
(c) Nitrogen
(d) Sulfur
The process of obtaining different gases by liquefaction and warming is known as:
(a) Crystallization
(b) Fractional distillation
(c) Sedimentation
(d) Filtration
To make steel hard we add
(a) Silicon
(b) Carbon
(c) Chromium
(d) Manganese
What is the chemical symbol for Manganese?
(a) Mo
(b) Mg
(c) Me
(d) Mn
Marsh gas is
(a) nitrogen
(b) carbon
(c) methane
(d) hydrogen
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Gobar gas contains mainly —
(a) Methane
(b) Carbon dioxide
(c) Butane
(d) Carbon Monoxide
Wet clothes dry even under a shade, because of :
(a) Evaporation
(b) Freezing
(c) Condensation
(d) Scattered sunlight and heat
Tetraethyl lead is used as —
(a) Mosquito repellent
(b) Pain Killer
(c) Fire extinguisher
(d) Petrol additive
A white substance having an alkaline nature in solution is
(a) NaNO3
(b) NH4Cl
(c) Na2CO3
(d) Fe2O3
What is the name for the temperature at which, theoretically, all molecular activity ceases and chemical reactions become impossible?
(a) Ground zero
(b) Freezing point
(c) Absolute zero
(d) Critical mass
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Which of the following is used in beauty parlors for hair setting ?
(a) Phosphorus
(b) Sulfur
(c) Chlorine
(d) Silicon
The chemical name of laughing gas is –
(a) Dinitrogen tetroxide
(b) Methane
(c) Nitrous oxide
(d) Ammonium Nitrate
The colour of liquid oxygen is:
(a) White
(b) Blue
(c) Orange
(d) Red
Tritium is an isotope of
(a) Oxygen
(b) Chlorine
(c) Hydrogen
(d) None of these
Which of the following is not correct for N2O?
(a) It is called laughing gas
(b) It is nitrous oxide
(c) It is not a linear molecule
(d) It is least reactive in all oxides of nitrogen
Quick Silver is the popular name of –
(a) Mercury
(b) Uranium
(c) Rubidium
(d) Sillicon
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Which of the following is the chief source of Napthalene?
(a) Moth ball
(b) Mothflakes
(c) Tar Camphor
(d) Coal tar
A solution contains 2 components.Which is in less quantity is called as:
(a) Substance
(b) Solvant
(c) Solution
(d) Solute
Gay Lussac proposed which of the following ?
(a) Law of Gases
(b) Motion of Planets
(c) Theory of Elctromagnetism
(d) Law of motion
The alkaline hydrolysis of oils or fats gives soap and:
(a) Glycerol
(b) Ethenol
(c) Glycol
(d) Ethanoic acid
The barometer that is convenient for use is :
(a) Torricellian barometer
(b) Aneroid barometer
(c) Mercury barometer
(d) Magdeburg’s barometer
When sulfur is boiled with Na2SO3 solution, the compound formed is
(a) Sodium sulfide
(b) Sodium sulfate
(c) Sodium persulphate
(d) Sodium thiosulfate
The reaction which converts sugar solution into alcohol is an example of
(a) saponification
(b) hydrogenation
(c) fermentation
(d) Hydrolysis
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Obsidian, caused naturally when lava cools very quickly, is what type of substance?
(a) Glass
(b) Pumice
(c) Crystal
(d) Granite
When an iron nail gets rusted, iron oxide is formed.
(a) With reduction of weight
(b) Without any change in weight
(c) Without any change in color
(d) With increase in weight
The yellow colour of Topaz crystal is due to the presence of
(a) Ferrous Oxide
(b) Nitrogen Oxide
(c) Calcium Oxide
(d) Aluminum fluorosilicate
Identify the layer of atmosphere in which most of the clouds and storms occur:
(a) Mesosphere
(b) Ionosphere
(c) Troposphere
(d) Exosphere
A saturated solution at S.T.P. is
(a) Colorless
(b) Green
(c) Red
(d) Red and green
The volume of 1 g each of methane (CH4), ethane (C2H6), propane (C3H8) and butane (C4H10) was measured at 350 K and 1 atm. What is the volume of butane
(a) 495 cm3
(b) 600 cm3
(c) 900 cm3
(d) 1700 cm3
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Which of the following is not a chemical action?
(a) Burning of coal
(b) Conversion of water into steam
(c) Digestion of food
(d) Burning of paper
The purest form of iron is
(a) Steel
(c) Stainless steel
(c) Cast iron
(d) Wrought iron
Sub-atomic particles of atoms are __
(a) Only protons
(b) Only neutrons
(c) Both protons & neutrons
(d) Proton, electron & neutron
Air is a
(a) Good conductor of electricity
(b) Bad conductor of electricity
(c) Good conductor heat
The fundamental particles present in the nucleus of an atom are
(a) Electron, proton
(b) Proton, neutron
(c) Neutron, electron
(d) Neutron, positron
The reading 4 on Beaufort scale indicates
(a) Wind
(b) Storm
(c) Breeze
(d) Rain
Acids turn blue litmus into
(a) Green
(b) Red
(c)Yellow
(d) Orange
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The state in which molecular attractions are very strong is .
(a) Solid
(b) Liquid
(c) Gas
(d) None of these
The substance coated on plastic tape recorder tapes is
(a) Zinc oxide
(b) Magnesium oxide
(c) Iron sulfate
(d) Iron oxide
Laws of electrolysis are given by:
(a) Farady
(b) Maxwell
(c) Lenz
(d) Bohr
Hemoglobin contains 0.33% of iron by weight. The molecular weight of hemoglobin is approximately 67200. The number of iron atoms (at wt. of Fe = 56) present in one molecule of hemoglobin are
(a) 1
(b) 2
(c) 4
(d) 6
On which of the following material of same volume, the upward thrust is more?
(a) Wood
(b) Wax
(c) Rubber
(d) Cork
Formation is a 40% solution of:
(a) Methanol
(b) Methenal
(c) Methanoic acid
(d) None of these
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In which of the following oxidation shows a positive oxidation state?
(a) CO
(b) N2O
(c) NO
(d) F2O
Atoms are electrically charged as
(a) Positive
(b) Negative
(c) Bi-positive
(d) Neutral
Washing soda is the common name for
(a) Calcium carbonate
(b) Calcium bicarbonate
(c) Sodium carbonate
(d) Sodium bicarbonate
The temperature at which a solid changes into liquid [at. 760mm. Hg] is
(a) Solidification point
(b) Vapourisation point
(c) Melting point
(d) Boiling point
A nitrogen hydrogen mixture initially in the moler of ratio of 1 : 3 reached equilibrium to form ammonia when 25% of the M2 had reacted. If the total pressure of the system was 21 atm, the partial pressure of ammonia at the equilibrium was
(a) 4.5 atm
(b) 3.0 atm
(c) 2.0 atm
(d) 1.5 atm
Marble is composed of
(a) Calcium carbonate
(b) Sodium Sulphate
(c) Calcium Oxide
(d) Calcium Sulphate
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Which of the following methods gives the average molecular weight of a polymer?
(a) sedimentation equilibrium method
(b) sedimentation velocity method
(c) light scattering method
(d) viscosity method
Which of the following is not correctly matched ?
(a) Galena : Lead Sulfide
(b) Green vitriol : Copper sulfate
(c) Plaster of Paris : Calcium sulfate
(d) Calomel : Mercurous Chloride
The process of pouring out the clean liquid above the sediment, to separate the solid particles from a liquid is called:
(a) Filtration
(b) Sedimentation
(c) Distillation
(d) Decantation
The law of multiple proportions was discovered by
(a) John Dalton
(b) Robert Brown
(c) Joseph Proust
(d) Way Kanada
When KMnO4 is reduced with oxalic acid in an acidic medium, the oxidation number of Mn changes from
(a) 7 to 4
(b) 6 to 4
(c) 7 to 2
(d) 4 to 2
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Molecules in Solids
(a) are free to move about
(b) cannot move
(c) interchange positions frequently
(d) are spherical in shape
Water is used in hot water bottles because:
(a) it is easily obtained in pure form
(b) it has high specific heat
(c) it is cheaper and not harmful
(d) it is easy to heat water
The trivalent ion/radical among the following is :
(a) Zinc
(b) Boron
(c) Barium
(d) Oxide
Among the following elements, which has the largest atomic size.
(a) Magnesium
(b) Phosphorus
(c) Lithium
(d) Sodium
__ is the purest form of Iron
(a) Wrought Iron
(b) Pig Iron
(c) Cast Iron
(d) Steel
Which of the following diffuses at the fastest rate?
(a) Solid
(b) Gas
(c) Liquid
(d) None of these
Which of the following processes of a colloidal suspension is used to determine the nature of charge on the particles?
(a) Dialysis
(b) Electrophoresis
(c) Sedimentation
(d) Ultrafiltration
Which of the following has an equal number of neutrons and protons?
(a) Hydrogen
(b) Deuterium
(c) iodine
(d) Chlorine
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pH is the concentration of ions of:
(a) Hydrogen
(b) Chloride
(c) Sodium
(d) Sulfate
Which of the following is the heavy isotope of hydrogen?
(a) Gold
(b) Iron
(c) Thorium
(d) Deuterium
The bivalent ion/radical among the following is :
(a) Nitride
(b) Phosphide
(c) Antimony
(d) Sulphate
Adhesive and cohesive forces are :
(a) Physical forces
(b) Chemical forces
(c) Electrical forces
(d) Magnetic forces
Most of the substances around us are
(a) Elements
(b) Compounds
(c) Mixtures
(d) None of the above
Gold numbers of x, y and z are 0.4, 0.002 and 10, respectively, then the correct order of their protective efficiency will be
(a) y > x > Z
(b) x > y > z
(c) z > y > x
(d) y > z > x
When freshly precipitated Fe(OH)2 is boiled with water in the presence of a few drops of dilute HCl, then the hydrated ferric oxide sol is formed. This method is an example of
(a) Solubilization
(b) Ultramicrofiltration
(c) Peptization
(d) Tyndall effect
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Given the electronegativities of three elements x = 1.0, y = 2.5, z = 3.0, the types of bonding formed between xz and yz respectively would be
(a) Covalent, ionic
(b) Ionic, covalent
(c) Polar covalent, covalent
(d) None of these
Which of the following is not a appropriate test for aniline?
(a) Isocyanide test
(b) Dye test
(c) Hypochlorite test
(d) Baeyer permanganate test
A red-coloured solution is obtained by adding a few drops of HCl to freshly precipitated ferric hydroxide.
This phenomenon is called
(a) Peptisation
(b) Dialysis
(c) Protection reaction
(d) None of the above
The process of coating iron sheets with a thin layer of zinc is called
(a) Hibernation
(b) Electroplating
(c) Galvanisation
Which of the following cannot be used for obtaining ethylamine from acetamide?
(a) LiAlH4
(b) NA + EtOH
(c) Br2 + KoH
(d) Ni/H2
Which of the following should be obtained on the reaction of formaldehyde in the presence of concentrated aqueous caustic alkali solution at room temperature?
(a) Sodium formate and ethyl alcohol
(b) Dark brown sticky polymer
(c) Methanol and formate ion
(d) Potassium salt of formic acid and alcohol
In a vessel containing SO3, SO2 and O2 at equilibrium, some helium gas is introduced so that the total pressure increases while temperature and volume remains constant. According to the chateller principle, the dissociation of SO3
(a) Increase
(b) Decrease
(c) Remain unaltered
(d) Changes unpredictable
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According to electrochemical series, the correct order of chemical reactivity with water is
(a) K > Zn > Cu > Mg
(b) K > Mg > Zn > Cu
(c) K > Mg > Cu > Zn
(d) Zn > K > Cu > Mg
Which one of the following is inflammable ?
(a) Helium
(b) Nitrogen
(c) Oxygen
(d) Hydrogen
The mechanism for the reaction is given below
The rate law expression for the reaction is
(a) r = k [P]2[Q]
(b) r = k[P][Q]
(c) r = k[A][R]
(d) r = k[P]2
Which of the following is/are inorganic gas(es)?
(a) Carbon monoxide
(b) Hydrogen sulfide
(c) Chlorine
(d) All of the above
Which particle can be removed from a stable neutral atom with the least energy?
(a) An alpha particle
(b) An electron
(c) A neutron
(d) A proton
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When 3 gram glucose (Mol. wt. = 180) is dissolved in 60 gram water at 15°C, then the osmotic pressure of the solution will be
(a) 6.57
(b) 0.65
(c) 0.34
(d) 5.57
Efficiency of a catalyst depends upon
(a) The size of its particle
(b) Its molecular weight
(c) Its solubility
(d) None of these
Which of the following is an organic gas?
(a) Hydrocarbons
(b) Aldehydes
(c) Ketones
(d) Ammonia
