CHEMISTRY GENERAL-KNOWLEDGE

Chemistry Questions

Objective Question on Chemistry

  • Q.1 The nucleus of an atom consists of

    1) electrons and neutrons

    2) electrons and protons

    3) protons and neutrons

    4) All of the above

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  • Q.2 The metallurgical process in which a metal is obtained in a fused state is called

    1)froth floatation

    2) calcinations

    3) smelting

    4) roasting

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  • Q.3 The number of moles of solute present in 1 kg of a solvent is called its

    1)formality

    2) molality

    3) normality

    4) molarity

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  • Q.4 The number of d-electrons in Fe2+ (Z = 26) is not equal to that of

    1)p-electrons in CI(Z = 17)

    2) p-electrons in Ne(Z = 10)

    3) s-electrons in Mg(Z = 12)

    4) d-electrons in Fe(Z = 26)

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  • Q.5 The metal used to recover copper from a solution of copper sulphate is

    1)Hg

    2) Fe

    3) Ag

    4) Na

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  • Q.6 The most electronegative element among the following is

    1)oxygen

    2) fluorine

    3) bromine

    4) sodium

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  • Q.7 The most commonly used bleaching agent is

    1)sodium chlorine

    2) chlorine

    3) carbon dioxide

    4) alcohol

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  • Q.8 The molecules of which gas have highest speed?

    1)H2 at -73oC

    2) O2 at 0oC

    3) N2 at 1,027oC

    4) CH4 at 300 K

    View Answer
  • Q.9 The gas present in the stratosphere which filters out some of the sun's ultraviolet light and provides an effective shield against radiation damage to living things is

    1)methane

    2) oxygen

    3) helium

    4) ozone

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  • Q.10 The main buffer system of the human blood is

    1)NH2CONH2 - NH2CONH+

    2) H2CO3 - CO32-

    3) CH3COOH - CH3COO-

    4) H2CO3 - HCO3

    View Answer
  • Q.11 The oldest rocks in the earth's crust were once molten, and came from deep inside the earth. The molten rock, called magma, spewed out in volcanic eruptions during the earth;s early life and solidified into hard rock's called

    1)sedimentary rocks

    2) granite

    3) igneous rocks

    4) basalt

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  • Q.12 The law which states that the amount of gas dissolved in a liquid is proportional to its partial pressure is

    1)Gay Lussac's law

    2) Henry's law

    3) Raoult's law

    4) Dalton's law

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  • Q.13 The names of the scientists, Newlands, Mendeleev, and Meyer are associated with the development of

    1)periodic table of contents

    2) discovery of elements

    3) atomic structure

    4) metallurgy

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  • Q.14 The maximum number of covalent formed by nitrogen is

    1)1

    2) 2

    3) 3

    4) 4

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  • Q.15 The metal that is usually extracted from sea water is

    1)Na

    2) Ca

    3) K

    4) Mg

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  • Q.16 The formula C6H5-CO-CH3 represents

    1)Phenyl acetate

    2) Acetic acid

    3) Acetophenone

    4) Acetone

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  • Q.17 The molecular formula of phosphorous is

    1)P1

    2) P2

    3) P3

    4) P4

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  • Q.18 The method of concentrating the ore which makes use of the difference in density between ore and impurities is called

    1)levigation

    2) magnetic separation

    3) liquation

    4) leaching

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  • Q.19 The inert gases are ____ in water

    1)insoluble

    2) sparingly soluble

    3) soluble

    4) None of these

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  • Q.20 The hardest form of carbon is

    1)charcoal

    2) graphite

    3) coke

    4) diamond

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  • Q.21 The metal does not give H2 on treatment with dilute HCL is

    1)Ag

    2) Ca

    3) Zn

    4) Fe

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  • Q.22 The main active constituent of tea and coffee is

    1)nicotine

    2) chlorophyll

    3) caffeine

    4) aspirin

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  • Q.23 The maximum number of isomers for an alkene with molecular formula C4H8 is

    1)2

    2) 4

    3) 3

    4) 5

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  • Q.24 The number of g-molecule of oxygen in 6.02 x 1024CO molecules is

    1)5 gram of molecule

    2) 10 gram of molecule

    3) 0.5 gram of molecule

    4) 1 gram of molecule

    View Answer
  • Q.25 The most extensive, commercially useful source of thorium as monazite sand occurs in India at

    1)Travancore coast

    2) Gujarat coast

    3) Orissa coast

    4) West Bengal coast

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  • Q.26 The half life period of an isotope is 2 hours. After 6 hours what fraction of the initial quantity of the isotope will be left behind?

    1) 1666666666666667/10000000000000000

    2) 3333333333333333/10000000000000000

    3) 1/8

    4) 1/4

    View Answer
  • Q.27 The mass number of an atom is equal to

    1)the number of protons and electrons

    2) the number of neutrons

    3) the number of nucleons

    4) the number of protons

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  • Q.28 The number of waves made by an electron moving in an orbit having maximum magnetic quantum number is +3

    1)5

    2) 4

    3) 0

    4) 2

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  • Q.29 The National Chemical Laboratory is situated in

    1)Bangalore

    2) Patna

    3) New Delhi

    4) Pune

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  • Q.30 Equal masses of oxygen, hydrogen and methane are kept under identical conditions. The ratio of the volumes of gases will be

    1)2:16:01

    2) 1:16:02

    3) 1:01:01

    4) 2:16:02

    View Answer
  • Q.31 The number of atoms present in 21.6 gram of silver (atomic weight = 108) are same as the molecules in

    1)12 moles of KMnO4

    2) 4.6 gram of C2H5OH

    3) 1.8 gram of H2O

    4) 0.6N H2SO4

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  • Q.32 The nucleus of a hydrogen atom consists of

    1)1 electron only

    2) 1 neutron only

    3) 1 proton only

    4) 1 proton + 2 neutron

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  • Q.33 The metal that is used as a catalyst in the hydrogenation of oils is

    1)Ni

    2) Pt

    3) Cu

    4) Pb

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  • Q.34 The nuclear particles which are assumed to hold the nucleons together are

    1)neutrons

    2) electrons

    3) positrons

    4) mesons

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  • Q.35 The octane number of zero is assigned to

    1)n-heptane

    2) 3-methyl octane

    3) iso-octane

    4) 2-methyl octane

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  • Q.36 The heat required to raise the temperature of body by 1 K is called

    1)specific heat

    2) thermal capacity

    3) water equivalent

    4) None of the above

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  • Q.37 The mass of P4O10 that will be obtained from the reaction of 1.33 gram of P4 and 5.07 of oxygen is

    1)5.05 gram

    2) 4.05 gram

    3) 2.05 gram

    4) 3.05 gram

    View Answer
  • Q.38 The most important ore of aluminium is

    1)bauxite

    2) monazite

    3) magnetite

    4) haematite

    View Answer
  • Q.39 The isomerism which exists between CH3CHCI2 and CH2CI. CH2CI is

    1)functional group isomerism

    2) metamerism

    3) positional isomerism

    4) chain isomerism

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  • Q.40 The number of electrons presents in H+ is

    1)0

    2) 1

    3) 2

    4) 3

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  • Q.41 The organic reaction represented by equation CH3 - CH = O + H2NOH gives CH3 - CH - NH + H2O is an example of

    1)an oxidation reaction

    2) an elimination reaction

    3) an addition reaction

    4) a condensation reaction

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  • Q.42 The human body is made up of several chemical elements; the element present in the highest proportion (65%) in the body is

    1)nitrogen

    2) oxygen

    3) carbon

    4) hydrogen

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  • Q.43 The hottest part of the gas flame is known as

    1)blue zone

    2) dark zone

    3) non-luminous zone

    4) luminous zone

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  • Q.44 What are the number of moles of CO2 which contains 16 g of oxygen?

    1)0.5 mole

    2) 0.2 mole

    3) 0.4 mole

    4) 0.25 mole

    View Answer
  • Q.45 The most abundant rare gas in the atmosphere is

    1)Xe

    2) Ar

    3) Ne

    4) He

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  • Q.46 The inherited traits of an organism are controlled by

    1)enzymes

    2) RNA molecules

    3) DNA molecules

    4) nucleotides

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  • Q.47 The heat energy produced when the human body metabolises 1 gram of fat is

    1)29 KJ

    2) 30 KJ

    3) 1 KJ

    4) 39 KJ

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  • Q.48 The ore which is found in abundance in India is

    1)magnetite

    2) bauxite

    3) monazite

    4) fluorspar

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  • Q.49 The Latin word formica means ant. The name formic acid is derived from this Latin word because

    1)this acid was first obtained by the distillation of ants

    2) ants are attracted by the odour of this acid

    3) this acid, in ancient times, was used to eliminate ant-hills

    4) this corrosive acid is secreted by ants to drive away their enemies

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  • Q.50 The high reactivity of fluorine is due to

    1)strong F - F bond

    2) availability of d-orbitals

    3) its high electro negativity

    4) small size of fluorine atom

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  • Q.51 The mineral containing both magnesium and calcium is

    1)calcite

    2) dolomite

    3) carnallite

    4) magnesite

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  • Q.52 The ionisation energy of hydrogen atom in the ground state is x KJ. The energy required for an electron to jump from 2nd orbit to 3rd orbit is

    1)7.2 x

    2) x/6

    3) 5x

    4) 5x/36

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  • Q.53 The main chemical constituent of clay is

    1)aluminium silicate

    2) silicon oxide

    3) aluminium borosilicate

    4) zeolites

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  • Q.54 The iron ore magnetite consists of

    1)Fe3OH4

    2) 3Fe2O3 .. 3H2O

    3) Fe2O3

    4) FeCO3

    View Answer
  • Q.55 The major constituent of air is

    1)oxygen

    2) nitrogen

    3) hydrogen

    4) carbon dioxide

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  • Q.56 The inexpensive and commonly used variety of glass is called soda glass. It is called so because

    1)was used initially for making bottles of soda(carbonated drink)

    2) is made using soda(sodium carbonate)

    3) was initially used for storing sodium carbonate

    4) is made using soda lime

    View Answer
  • Q.57 The mass of one Avogadro number of helium atom is

    1)4 x 6.02 x 1023 gram

    2) 8.00 gram

    3) 1.00 gram

    4) 4.00 gram

    View Answer
  • Q.58 The number of waves in n x 10th Bohr's orbit are

    1)n

    2) n2

    3) n3

    4) n-2

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  • Q.59 The mass number of a nucleus is

    1)a fraction

    2) always more than the atomic weight

    3) the sum of the number of protons and neutrons present in the nucleus

    4) always less than its atomic number

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  • Q.60 The items amenable to detection by soft x-rays are

    1)lead in bullets

    2) narcotics

    3) contrabands

    4) genuine coins from counterfeit coins

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  • Q.61 The material which can be deformed permanently by heat and pressure is called a

    1)thermoset

    2) thermoplastic

    3) polymer

    4) chemical compound

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  • Q.62 The oil used in the froth floatation process is

    1)kerosene oil

    2) olive oil

    3) pine oil

    4) coconut oil

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  • Q.63 The main use of salt in the diet is to

    1)increase the solubility of food particles in water

    2) make the taste of food better

    3) produce in small amounts the hydrochloric acid required for the digestion of food

    4) ease the process of cooking

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  • Q.64 The number of water molecules present in a drop of water (volume 0.0018 ml) at room temperature is

    1)4.84 x 1017

    2) 1.568 x 103

    3) 6.023 x 1023

    4) 6.023 x 1019

    View Answer
  • Q.65 The luster of a metal is due to

    1)presence of free electrons

    2) its high polishing

    3) its chemical inertness

    4) its high density

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  • Q.66 The most malleable metal is

    1)iron

    2) gold

    3) silver

    4) platinum

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  • Q.67 The monomer of polythene is

    1)ethyl alcohol

    2) vinyl chloride

    3) ethylene

    4) None of the above

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  • Q.68 The gas used in the manufacture of vanaspati from vegetable oil is

    1)hydrogen

    2) carbon dioxide

    3) oxygen

    4) nitrogen

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  • Q.69 The most electropositive elements among the following is

    1)K

    2) Na

    3) Ca

    4) Cs

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  • Q.70 The first metal used by man was

    1)bronze

    2) copper

    3) iron

    4) gold

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  • Q.71 The ionic radii of N3-, O2-, F- and Na+ follows the order

    1)O2- > F- > Na+ > N3-

    2) Na+ > O2- > N3- > F-

    3) N3- > O2- > F- > Na+

    4) N3- > Na+ > O2- > F-

    View Answer
  • Q.72 The hydronium ion is

    1)H3O+

    2) H2+

    3) H+

    4) HO -

    View Answer
  • Q.73 The graphite rods in the nuclear reactor

    1)undergo combustion which triggers the nuclear fission

    2) convert fast moving neutrons into thermal neutrons

    3) react with U to release energy

    4) produce neutrons

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  • Q.74 The method that cannot be used for removing permanent hardness of water is

    1)distillation

    2) adding sodium carbonate

    3) adding caustic soda

    4) boiling

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  • Q.75 The molecule which has the highest percentage of ionic character among the following is

    1)HBr

    2) HI

    3) HF

    4) HCI

    View Answer
  • Q.76 Zone refining is used for the purification of

    1)Cu

    2) Ge

    3) Ag

    4) Au

    View Answer
  • Q.77 The main chemical constituent of the oil of cardamom which is responsible for flavour of this oil is

    1)cineole

    2) limonene

    3) engenol

    4) geraniol

    View Answer
  • Q.78 The following are the half lives of four active isotopes. Which one of the following is the most dangerous to handle?

    1)100 years

    2) 13 days

    3) 0.01 minute

    4) 3 billion years

    View Answer
  • Q.79 The gas used for artificial ripening of green fruit is

    1)acetylene

    2) carbon dioxide

    3) ethane

    4) ethylene

    View Answer
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