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JEE Main Chemistry · Some Basic Concepts of Chemistry · Set 6 (Q151-180)

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  1. 151.
    The amount of heat evolved when of is mixed with of is
    1. (1)
    2. (2)
    3. (3)
    4. (4)
  2. 152.
    The elemental composition of a compound is and . If the molar
    mass of the compound is , the molecular formula of the compound is : [Given : The relative atomic mass of
    1. (1)
    2. (2)
    3. (3)
    4. (4)
  3. 153.
    Percentage of Se in peroxidase anhydrous enzyme is 0.5% by weight then minimum molecular weight of peroxidase anhydrous enzyme is
    1. (1)
    2. (2)
    3. (3)15.68
    4. (4)
  4. 154.
    A metal chloride contains 55.0% of chlorine by weight. 100 mL vapours of the metal chloride at STP weigh 0. 57 g. The molecular formula of the metal chloride is (Given: Atomic mass of chlorine is 35. 5 u)
    1. (1)
    2. (2)
    3. (3)
    4. (4)MCI
  5. 155.
    The molality of a urea solution in which 0.0100 g of urea, [CO] is added to 0.3000 of water at STP is:
    1. (1)5.55 ×
    2. (2)33.3 m
    3. (3)3.33 × m
    4. (4)0.555 m
  6. 156.
    of methane is completely burnt using of oxygen. The volume of the gas left after cooling to room temperature is
    1. (1)
    2. (2)
    3. (3)
    4. (4)
  7. 157.
    Compound A contains 8.7% Hydrogen, 74% Carbon and 17.3% Nitrogen. The molecular formula of the compound is, Given : Atomic masses of C, H and N are 12, 1 and 14 amu respectively.The molar mass of the compound A is 162 g .
    1. (1)
    2. (2)N
    3. (3)N
    4. (4)
  8. 158.
    If one atom of an element weighs . Then, find the number of moles of atoms in of element .
    1. (1)500 moles
    2. (2)125 moles
    3. (3)1250 moles
    4. (4)50 moles
  9. 159.
    of is titrated against solution. The titration is discontinued after adding of . The remaining titration is completed by adding . The volume of required for completing the titration is
    1. (1)
    2. (2)
    3. (3)
    4. (4)
  10. 160.
    What is the atomic mass of ?
    Given abundance of
    1. (1)55.65
    2. (2)55.75
    3. (3)55.85
    4. (4)55.95
  11. 161.
    During the process of fermentation, the number of moles of liberated from one mole of glucose is
    1. (1)2
    2. (2)3
    3. (3)4
    4. (4)1
  12. 162.
    One gram of silver gets distributed between of molten zinc and of molten lead at . The percentage of silver still left in the lead layer is approximately
    1. (1)2
    2. (2)5
    3. (3)3
    4. (4)1
  13. 163.
    What is the atomicity of aluminium phosphate?
    1. (1)8
    2. (2)6
    3. (3)5
    4. (4)13
  14. 164.
    Which of the following concentration terms depends on temperature?
    1. (1)Molality
    2. (2)Molarity
    3. (3)Mole fraction
    4. (4)Percent by mass
  15. 165.
    6.02 × molecules of urea are present in 100 ml of its solution. The concentration of urea solution is –
    1. (1)0.001 M
    2. (2)0.01 M
    3. (3)0.02 M
    4. (4)0.1 M
  16. 166.

    Consider the above reaction, what mass of will be formed if 250 mL of 0.76 M HCl reacts with 1000 g of ?
    (Given : Molar mass of Ca, C, O, H and Cl are 40, 12, 16, 1 and 35.5 g mol, respectively)
    1. (1)3.908 g
    2. (2)2.636 g
    3. (3)10.545 g
    4. (4)5.272 g
  17. 167.
    Which of the following gases will have least volume if 10 g of each gas is taken at same temperature and pressure?
    1. (1)
    2. (2)
    3. (3)
    4. (4)HCl
  18. 168.
    For a reaction, identifydihydrogen as a limiting reagent in the following reaction mixtures.
    1. (1)56 g of of
    2. (2)35 g of of
    3. (3)28 g of of
    4. (4)14 g of of
  19. 169.
    0.24 of a volatile gas, upon vaporisation, gives 45 vapour at NTP What will be the vapour density of the substance? Density of
    1. (1)95.93
    2. (2)59.93
    3. (3)95.39
    4. (4)5.993
  20. 170.
    A solution of sugar is obtained by mixing 200 g of its 25% solution and 500 g of its 40% solution (both by mass). The mass percentage of the resulting sugar solution is_______(Nearest integer)
  21. 171.
    thick coating of silver is deposited on a plate of area. The number of silver atoms deposited on plate are________ . (At mass )
  22. 172.
    The number of atoms in 8 g of sodium is x × .
    The value of x is ____. (Nearest integer)
    [Given : = 6.02 ×
    Atomic mass of Na = 23.0u]
  23. 173.
    1 mole of is oxidised by " " moles of to get " " moles of _______
  24. 174.
    Complete combustion of of an organic compound provides of and of . The percentage composition of carbon and hydrogen in organic compound is and respectively. (Round off tothe Nearest Integer)
  25. 175.
    The molarity of orthophosphoric acid having purity by weight (specific gravity ) is______ M. (Molar mass of )
  26. 176.
    On complete combustion, 0.492 g of an organic compound gave 0.792 g of .
    The % of carbon in the organic compound is_____ (Nearest integer)
  27. 177.
    The density of 3 M solution of NaCl is 1.0 g . Molality of the solution is__________ x m.(Nearest integer).
    Given: Molar mass of Na and Cl is 23 and 35.5 g respectively,
  28. 178.
    An organic compound weighing 500 mg, produced 220 mg of , on complete combustion. The percentage composition of carbon in the compound is %. (nearest integer)
    (Given molar mass in of )
  29. 179.
    The number of significant figures in 50000.020 is:
  30. 180.
    1.86 g of aniline completely reacts to form acetanilide. 10%of the product is lost during purification. Amount of acetanilide obtained after purification (in g) is ____ .