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Some Basic Concepts of Chemistry Test - 4

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Some Basic Concepts of Chemistry Test - 4
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Weekly Quiz Competition
  • Question 1
    1 / -0
    Molarity of liquid water at 4°C is
  • Question 2
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    Which of the following statements about pure substances is correct ?

    Solution

    Pure substances have fixed composition..These may be both  (ie. either elements or compounds ) . The law of constant composition holds good for such substances .

  • Question 3
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    In scientific notation for numbers, any number can be represented in the form, N × 10n   where,

    Solution

    Scientific notation is conveniently used to represent extremely large or even very small numerical values. It is an exponential notation in which any number can be represented in the form,  N x 10n, where n is an exponent having positive or negative values and N can vary between  1 and  10, but not  10 itself.

  • Question 4
    1 / -0
    The prefix of the fraction 10–12 and its symbol respectively are
  • Question 5
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    Matter can be classified at the macroscopic or bulk level as

    Solution

    At macroscopic level matter is classified as mixture or pure substances

    A mixture contains two or more components (in any ratio )  present in it , for example -- sugar solutions in water , tea , air , alloys like brass ,bronze etc.

    Pure substances (viz. copper  , silver , gold  , water , glucose etc . )   have  fixed composition .

    The constituents of pure substances can not be separated by simple physical methods.  

  • Question 6
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    Significant figures are

    Solution

    Significant  digits are certain digits that have significance or meaning to certain digits in a number . Such digits help scientists to use them with more precise information about measurement and other numeric data. These digits also help them in rounding off very large or very small number

  • Question 7
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    On reduction with hydrogen, 3.6 g of an oxide of a metal left 3.2 g of the metal. If the vapour density of the metal was 32 g/L, then the simplest formula of the oxide would be 
  • Question 8
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    Chemistry does not play a major role in

    Solution

    Chemistry does not deal in explaining superconductivity.

    • In superconducting materials, the characteristics of superconductivity appear when the temperature is lowered below a critical temperature.
    • The onset of superconductivity is accompanied by abrupt changes in physical properties which are more related to phase transitions of the material.
    These aspects of studies in properties of materials are better related to studies in the fields of Physics, even though principles involved in Chemistry & Physics go hand to hand.  

  • Question 9
    1 / -0
    If 6.3 g of NaHCO3 is added to 15.0 g of CH3COOH solution, the weight of the residue is found to be 18.0 g. What is the mass of CO2 released in the reaction?
  • Question 10
    1 / -0
    One micrometer stands for
  • Question 11
    1 / -0
    The volume of oxygen necessary for complete combustion of 20 litres of propane is _________ litres.
  • Question 12
    1 / -0
    The approximate number of molecules in one litre of water is 
  • Question 13
    1 / -0
    Consider the following skeleton equation:

    __As2O3 + __SnCl2 + __HCl → __SnCl4 + __As + __H2O

    What are the stoichiometric coefficients of As2O3, SnCl2, HCl, SnCl4, As and H2O, when the above equation is balanced?
  • Question 14
    1 / -0
    The ratio between the volumes of the gaseous reactant and the gaseous products can be expressed in simple whole numbers. This law is known as
  • Question 15
    1 / -0
    How many significant figures are present in 0.324?
  • Question 16
    1 / -0
    If 500 cc of water gas (CO + H2) is exploded with 500 cc of oxygen, then what will be the volume ratio of CO2 : Steam : O2?
    (Assume that the volumes are measured under the same temperature and pressure.)
  • Question 17
    1 / -0
    If in a reaction, HNO3 is reduced to NO, the mass of HNO3 absorbing one mole of electrons would be
  • Question 18
    1 / -0
    Directions: The following question has four choices, out of which ONLY ONE is correct.

    A certain non-metal X forms two oxides A and B. The mass percentage of oxygen in oxide A (X4O6) is 43.7%, which is the same as that of X in the oxide B. The formula of the oxide B is
  • Question 19
    1 / -0
    Which of the following correctly represents a balanced chemical equation?
  • Question 20
    1 / -0
    The molarity of concentrated sulphuric acid ( = 1.834 g cm–3) containing 95% of H2SO4 by mass is
  • Question 21
    1 / -0

    In a homogeneous mixture,the components are

    Solution

    In a homogeneous mixture,

    (i)  the components   are    mixed  together  completely ,
    (ii)   has a uniform composition throughout.

  • Question 22
    1 / -0

    SI units for Base Physical Quantities of length, mass and current are

    Solution

    The International System of units ( abbreviated as SI ) is modern form of metric system , and is most widely used form of measurements .

    It comprises of a coherent system of measurement built of seven base units .

    The base units for length , mass and current in  this system of measurements are , " meter , kilogram  , ampere  "  ,symbolised respectively as as  m  ,kg , A

  • Question 23
    1 / -0
    NH3 obtained from different sources always contains nitrogen and hydrogen in the ratio 1 : 3. This is in accordance with
  • Question 24
    1 / -0

    Particles of compounds are


    Solution

    Compounds are made when

    atoms of two or more different elements combine together in fixed ratio to form molecules .(viz. water , ammonia , carbon- di- oxide glucose etc. ).

    Thus the  particles of compound consists of molecules.


  • Question 25
    1 / -0
    The mass of 2.6 moles of sulphur dioxide is
  • Question 26
    1 / -0
    Atomic mass of carbon is 12 u. One atom of magnesium is twice as heavy as one carbon atom. What is the atomic mass of magnesium?
  • Question 27
    1 / -0

    Fill up the  blank  with  suitable word in the statement,

    " Physical properties are those properties which are measured or observed--------------- changing the identity or the composition of the substance ."

    Solution

    A substance is identified by its composition  , hence for measuring physical properties of a substance its identity must be retained  , (or should not be changed )  Hence , the given statement ,

    " Physical properties are those properties which are measured or observed without changing the identity or composition of the substance."


    is correct.

  • Question 28
    1 / -0
    Which among the following illustrates the law of reciprocal proportions?
  • Question 29
    1 / -0
    Volume of CO2 obtained from complete decomposition of 126 g of CaCO3 at STP is
  • Question 30
    1 / -0

    Precision and Accuracy refer to _______ of various measurements for the same quantity repeatedly  and agreement of a particular value to the ------- --------  of the result , respectively.

    Solution

    Precision means closeness of all the data values measured while accuracy means closeness of particular value with the real value.

    For example,

    when the reported values are  2.01, and 1.99 g as the result and its true value is 2.00 g.  
    These values are both precise and accurate.

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