Practice Test


1) Avogadro's work was brought to light, after his death, by.


2) Chemistry is a _______ science.


3) _____ chemistry deals with the chemistry of elements other than carbon and of their compounds.


4) The branch of chemistry that deals with the structure of matter, the energy changes and the theories, laws and principles that explain the transformation of matter from one form to another is called______ chemistry.


5) ______ chemistry is the chemistry of the substance consisting of living organisms.


6) The branch of chemistry that deals with the separation, identification and quantitative determination of the composition of different substances is called______ chemistry.


7) Agidothymidine drug is used for treating_______ patients.


8) ______ pigment acts as a photosynthesizer in plants.


9) Solar energy can be converted into electrical energy using.


10) Microprocessor used in computers are_______ chips developed by chemists.


11) If two or more phases are present in a mixture then it is called a _______ mixture.


12) The arbitrarily decided and universally accepted standards are called.


13) Antoine Lavoisier proved that the flammable air produced by Cavendish was a new gas and named it as.


14) Which out of the following is NOT a homogeneous mixture?


15) Substance which cannot be decomposed into two different substances by chemical process are called.


16) Which of the following is a compound?


17) Which of the following is a fundamental quantity?


18) Which of the following is a unit of energy?


19) Mixture of all gases constitute ______ system.


20) Mixture of liquids constitute_______ system.


21) Phenol - water system is a


22) Joseph Priestly found that the gas evolved on heating mercury oxide, supported vigorous burning. He named this gas as


23) _____ elements exist naturally.


24) _____ is the unit of luminous intensity.


25) _______ is a substance of definite composition which can be decomposed into two or more substances by a simple chemical process.


26) There are ________ Fundamental SI units.


27) The law of definite coposition was proposed by.


28) The law of multiple proportions is illustrated by


29) Two elements, X (At. Mass 16) and Y (At. Mass 14) combine to form compounds A, B and C. The ratio of different masses of Y which combine with fixed mass of X in A, B and C is 1:3:5. If 32 parts by mass of X combine with 84 parts by mass of Y in B, then in C, 16 parts by mass of X will combine with


30) The sum of the masses of reactants and product is equal in any physical or chemical reaction. This is in accordance with


31) The law of multiple proportions is given by


32) Greek philosopher_____ had suggested that matter is composed of extremely small a-tomio.


33) On the basis of his assumptions, Dalton explained


34) Dalton assumed that_______ are the smallest particles of compound.


35) A _______ is an aggregate of two or more atoms of definite composition which are held together by chemical bonds.


36) SI unit of mass is


37) Volume occupied by 1 g molecular weight of any gas is called


38) ______ is the sum of the atomic weights of all the atoms as given in the molecular formula of the substance.


39) The mass percentage of each constituent element present in 100 g of compound is called its


40) ________ law of combining volumes state that "Whenever gases combine, they do so in simple ratio by volumes".


41) Pure water can be obtained from various sources, but it always contain hydrogen and oxygen, combined in a ratio of 1:8 by weight. This is an example of


42) Recently the unit of atomic mass amu is replaced by.


43) Molar mass is a ______ quantity.


44) Avogadro number is number of particles present in


45) Number of moles of water in 1 L of water with density 1 g/cc are


46) 27 g of Al (At. Mass = 27) will react with oxygen equal to


47) The largest number of molecules is present in


48) Avogadro's number is


49) Mole triangle is the relationship between the mass of a gas, the number of moles, the volume at S.T.P. and the


50) The number of moles of sodium oxide in 620 g of it is


51) 4.4 g of an unknown gas occupies 2.24 L of volume at standard temperature and pressure. The gas may be


52) Avogadro's law distinguishes between


53) The percentage of oxygen in NaOH is


54) ______ of a compound is the chemical formula indicating the relative number of atoms in the simplest ratio.


55) _______ indicates the actual number of constituents atoms in a molecule.


56) Chemical formula cannot be determined by using


57) The _______ coefficients are the coefficients of reactants and products in the balanced chemical reaction.


58) _______ reactant is the reactant that reacts completely but limits further progress of the reaction.


59) ________ reactant is the reactant which is taken in excess than the limiting reactant.


60) A________ chemical reaction may be used to establish the weight relationships of reactants and products.


61) The starting material which takes part in chemical reaction is called.


62) The study of the composition, structure and properties of matter and the reactions by which one form of matter may be converted into another form is called.


63) Amalgams are synthesized using________ technology.


64) A______ is a simple combination of two or more substance in which the constituent substances retain their separate identities.


65) Law of conservation of mass was first stated by


66) Which of the following is indivisible by chemical methods?


67) Atom is the smallest particle of


68) Number of water molecules in a drop of water, if 1 mL of water has 20 drops and A is Avogadro number, is


69) Which of the following law states that equal volume of all gases contain equal number of molecules?


70) Magnitude of 'micro-' is


71) The unit of concentration is


72) Which of the following is a fundamental SI unit?


73) SI unit of velocity is


74) SI unit of temperature is


75) Which of the following reaction has the ratio of volumes of reacting gases and the product as 1:2:2?


76) Atoms have a mass of the order


77) Atoms have a radius of the order


78) The number of atoms in 6 amu of He is


79) The number of molecules present in 0.032 mg of methane is


80) Number of molecules in 0.4 g of He is


81) At STP, 2 g of helium gas (molar mass = 4) occupies a volume of


82) Which of the following contains maximum number of atoms?


83) How many moles of electrons weight one kilogram?


84) Number of atoms of He in 100 amu of He (At. mass of He = 4) is


85) The number of molecules in 16 g of oxygen is


86) Which of the following has maximum number of atoms?


87) Which of the following contains more molecules?


88) 1 g - atom of nitrogen represents


89) Which of the following represents 1g - molecule of the substance?


90) How many molecules are present in one gram of hydrogen?


91) The number of atoms of oxygen present in 11.2 L of ozone at N.T.P are


92) The number of water molecules present in a drop of water weighing 0.018 g is


93) The total number of electrons present in 3.2 g of methane is


94) According to Avogadro's law


95) The number of atoms present in 1 mole of water is


96) The gram molecule of benzene is equal to


97) The mass of 1 atom of hydrogen is


98) Which pair of species have same percentage of carbon?


99) A compound made of two element A and B are found to contain 25% A (At. mass 12.5) and 75% B (At.mass 37.5). The simplest formula of the compound is


100) Two element x (At. mass 75) and Y (At. mass 16) combine to give a compound having 75.8% X. The formula of the compound is


101) The molecular mass of an organic compound is 78. Its empirical formula is CH. The molecular formula is


102) Empirical formula of glucose is


103) The present atomic weight scale is based on


104) The molecular formula of the compound with molar mass 159, containing 39.62% Cu and 20.13% S is