Practice MCQ Chemistry

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2818 The number of moles of solute present in 1 kg of a solvent is called its
Options:molality,    molarity,    normality,    formality

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2819 The most electronegative element among the following is
Options:sodium,    bromine,    fluorine,    oxygen

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2820 The metal used to recover copper from a solution of copper sulphate is
Options:Na,    Ag,    Hg,    Fe

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2821 The number of d-electrons in Fe2+ (Z = 26) is not equal to that of
Options:p-electrons in Ne(Z = 10),    s-electrons in Mg(Z = 12),    d-electrons in Fe(Z = 26),    p-electrons in CI(Z = 17)

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2822 The metallurgical process in which a metal is obtained in a fused state is called
Options:smelting,    roasting,    calcinations,    froth floatation

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2823 The molecules of which gas have highest speed?
Options:H2 at -73oC,    CH4 at 300 K,    N2 at 1,027oC,    O2 at 0oC

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2824 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
Options:granite,    basalt,    igneous rocks,    sedimentary rocks

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2825 The law which states that the amount of gas dissolved in a liquid is proportional to its partial pressure is
Options:Dalton's law,    Gay Lussac's law,    Henry's law,    Raoult's law

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2826 The main buffer system of the human blood is
Options:H2CO3 - HCO3,    H2CO3 - CO32-,    CH3COOH - CH3COO-,    NH2CONH2 - NH2CONH+

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2827 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
Options:helium,    ozone,    oxygen,    methane

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2828 The most commonly used bleaching agent is
Options:alcohol,    carbon dioxide,    chlorine,    sodium chlorine

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2829 The nucleus of a hydrogen atom consists of
Options:1 proton only,    1 proton + 2 neutron,    1 neutron only,    1 electron only

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2830 The heat required to raise the temperature of body by 1 K is called
Options:specific heat,    thermal capacity,    water equivalent,    None of the above

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2831 The nuclear particles which are assumed to hold the nucleons together are
Options:electrons,    positrons,    neutrons,    mesons

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2832 The mass of P4O10 that will be obtained from the reaction of 1.33 gram of P4 and 5.07 of oxygen is
Options:2.05 gram,    3.05 gram,    4.05 gram,    5.05 gram

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2833 The octane number of zero is assigned to
Options:2-methyl octane,    n-heptane,    iso-octane,    3-methyl octane

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2834 The metal that is used as a catalyst in the hydrogenation of oils is
Options:Ni,    Pb,    Cu,    Pt

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2835 The most abundant rare gas in the atmosphere is
Options:He,    Ne,    Ar,    Xe

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2836 The Latin word formica means ant. The name formic acid is derived from this Latin word because
Options:this acid, in ancient times, was used to eliminate ant-hills,    this corrosive acid is secreted by ants to drive away their enemies,    this acid was first obtained by the distillation of ants,    ants are attracted by the odour of this acid

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2837 The ore which is found in abundance in India is
Options:monazite,    fluorspar,    bauxite,    magnetite

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2838 The inherited traits of an organism are controlled by
Options:RNA molecules,    nucleotides,    DNA molecules,    enzymes

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2839 The heat energy produced when the human body metabolises 1 gram of fat is
Options:30 KJ,    1 KJ,    39 KJ,    29 KJ

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2840 What are the number of moles of CO2 which contains 16 g of oxygen?
Options:0.5 mole,    0.2 mole,    0.4 mole,    0.25 mole

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2841 The main use of salt in the diet is to
Options:make the taste of food better,    produce in small amounts the hydrochloric acid required for the digestion of food,    ease the process of cooking,    increase the solubility of food particles in water

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2842 The monomer of polythene is
Options:vinyl chloride,    ethylene,    ethyl alcohol,    None of the above

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2843 The luster of a metal is due to
Options:its high density,    its high polishing,    its chemical inertness,    presence of free electrons

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2844 The number of water molecules present in a drop of water (volume 0.0018 ml) at room temperature is
Options:1.568 x 103,    6.023 x 1019,    4.84 x 1017,    6.023 x 1023

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2845 The most malleable metal is
Options:platinum,    silver,    iron,    gold

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2846 The oil used in the froth floatation process is
Options:coconut oil,    olive oil,    kerosene oil,    pine oil

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2847 The number of waves in n x 10th Bohr's orbit are
Options:n2,    n,    n-2,    n3

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2848 The mass of one Avogadro number of helium atom is
Options:1.00 gram,    4.00 gram,    8.00 gram,    4 x 6.02 x 1023 gram

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2849 The items amenable to detection by soft x-rays are
Options:contrabands,    lead in bullets,    narcotics,    genuine coins from counterfeit coins

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2850 The material which can be deformed permanently by heat and pressure is called a
Options:thermoplastic,    thermoset,    chemical compound,    polymer

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2851 The mass number of a nucleus is
Options:always less than its atomic number,    the sum of the number of protons and neutrons present in the nucleus,    always more than the atomic weight,    a fraction

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2852 The inexpensive and commonly used variety of glass is called soda glass. It is called so because
Options:was used initially for making bottles of soda(carbonated drink),    is made using soda(sodium carbonate),    was initially used for storing sodium carbonate,    is made using soda lime

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2853 The gas used in the manufacture of vanaspati from vegetable oil is
Options:hydrogen,    oxygen,    nitrogen,    carbon dioxide

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2854 The ionic radii of N3-, O2-, F- and Na+ follows the order
Options:N3- > O2- > F- > Na+,    N3- > Na+ > O2- > F-,    Na+ > O2- > N3- > F-,    O2- > F- > Na+ > N3-

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2855 The graphite rods in the nuclear reactor
Options:react with U to release energy,    produce neutrons,    undergo combustion which triggers the nuclear fission,    convert fast moving neutrons into thermal neutrons

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2856 The first metal used by man was
Options:iron,    copper,    gold,    bronze

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2857 The hydronium ion is
Options:H+,    HO -,    H2+,    H3O+

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2858 The most electropositive elements among the following is
Options:Na,    Ca,    K,    Cs

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2859 The method that cannot be used for removing permanent hardness of water is
Options:adding sodium carbonate,    distillation,    adding caustic soda,    boiling

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2860 The following are the half lives of four active isotopes. Which one of the following is the most dangerous to handle?
Options:3 billion years,    100 years,    0.01 minute,    13 days

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2861 The gas used for artificial ripening of green fruit is
Options:ethylene,    ethane,    carbon dioxide,    acetylene

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2862 Zone refining is used for the purification of
Options:Au,    Ge,    Ag,    Cu

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2863 The main chemical constituent of the oil of cardamom which is responsible for flavour of this oil is
Options:cineole,    engenol,    geraniol,    limonene

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2864 The molecule which has the highest percentage of ionic character among the following is
Options:HI,    HF,    HCI,    HBr

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2865 The high reactivity of fluorine is due to
Options:its high electro negativity,    small size of fluorine atom,    availability of d-orbitals,    strong F - F bond

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2866 The iron ore magnetite consists of
Options:Fe2O3,    Fe3OH4,    FeCO3,    3Fe2O3 .. 3H2O

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2867 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
Options:5x/36,    5x,    7.2 x,    x/6

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