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NEET Chemistry · Some Basic Concepts of Chemistry · Set 3 (Q61-90)

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  1. 61.
    6. molecules of urea are present in 100 of its solution. The concentration of solution is
    1. (1)0.001
    2. (2)0.1
    3. (3)0.02
    4. (4)0.01
  2. 62.
    The number of moles of hydrogen that can be added to 1 mole of an oil is the highest in
    1. (1)linseed oil
    2. (2)groundnut oil
    3. (3)sunflower seed oil
    4. (4)mustard oil.
  3. 63.
    An organic compound contains C, H and S. The minimum molecular weight of the compound containing 8% sulphur is: (atomic weight of S = 32 amu)
    1. (1)300 g
    2. (2)400 g
    3. (3)200 g
    4. (4)600 g
  4. 64.
    of oxygen contains as many atoms as in
    1. (1) of hydrogen
    2. (2) of hydrogen
    3. (3) of hydrogen
    4. (4) of hydrogen
  5. 65.
    A 5-molar solution of is diluted from llitre to a volume of 10litres, the normality of the solution will be
    1. (1)1
    2. (2)0.1
    3. (3)5
    4. (4)0.5
  6. 66.
    In an organic compound of molar mass 108 g C, H and N atoms are present in 9 : 1 : 3.5 by weight. Molecular formula can be:
    1. (1)
    2. (2)N
    3. (3)
    4. (4)
  7. 67.
    Using the rules for significant figures, the correct answer for the expression will be:
    1. (1)0.005613
    2. (2)0.00561
    3. (3)0.0056
    4. (4)0.006
  8. 68.
    Nitrogen can be estimated by Kjeldah's method for which of the following compound?
    1. (1)
    2. (2)
    3. (3)
    4. (4)
  9. 69.
    If a rocket runs on a fuel ( ) and liquid oxygen, the weight of oxygen required and released for every litre of fuel respectively are: (Given: density of the fuel is 0.756 g/mL)
    1. (1)1188 g and 1296 g
    2. (2)2376 g and 2592 g
    3. (3)2592g and 2376 g
    4. (4)3429 g and 3142 g
  10. 70.
    25 mL of the given HCl solution requires 30 mL of 0.1 M sodium carbonate solution. What is the volume of this HCl solution required to titrate 30 mL of 0.2 M aqueous NaOH solution?
    1. (1)25 mL
    2. (2)75 mL
    3. (3)50 mL
    4. (4)12.5 mL
  11. 71.
    What is the percentage of carbon in urea? (At. mass : )
    1. (1)
    2. (2)
    3. (3)
    4. (4)
  12. 72.
    Round the number 234555359 to 3 significant figures.
    1. (1)234000000
    2. (2)234000
    3. (3)235000000
    4. (4)234500000
  13. 73.
    20.0 g of a magnesium carbonate sample decomposes on heating to give carbon-dioxide and 8.0 g magnesium oxide. What will be the percentage purity of magnesium carbonate in the sample? (Atomic weight of )
    1. (1)75
    2. (2)96
    3. (3)60
    4. (4)84
  14. 74.
    One mole of carbon atom weighs 12 g , the number of atoms in it is equal to, (Mass of carbon-12 is )
    1. (1)
    2. (2)
    3. (3)
    4. (4)
  15. 75.
    The molarity of Cl¯ in an aqueous solution which was (w/V) 2% NaCl, 4% and 6% Cl will be
    1. (1)0.342
    2. (2)0.721
    3. (3)1.12
    4. (4)2.18
  16. 76.
    In the reaction,
    1. (1) at STP is produced for every mole of HCl consumed.
    2. (2) is produced regardless of temperature and pressure for every mole of Al tat reacts.
    3. (3) is consumed for every produced.
    4. (4) at STP is produced for every mole of Al that reacts.
  17. 77.
    What is the total number of electrons present in one mole of ethane?
    1. (1)
    2. (2)
    3. (3)
    4. (4)
  18. 78.
    What amount of conc. solution should be used to prepare of ? (The concentration of solution being used is and molecular mass of
    1. (1)
    2. (2)
    3. (3)
    4. (4)
  19. 79.
    Dimensions of pressure are same as that of
    1. (1)Energy
    2. (2)Force
    3. (3)Energy per unit volume
    4. (4)Force per unit volume
  20. 80.
    2.8 of is left after removing molecules from its ' ' mg sample. The
    mass of taken initially is Given:
    1. (1)98.3 mg
    2. (2)48.2 mg
    3. (3)196.2 mg
    4. (4)150.4 mg
  21. 81.
    Empirical formula of a compound is and its molecular mass is 90 , the molecular formula of the compound is
    1. (1)
    2. (2)
    3. (3)
    4. (4)
  22. 82.
    If molecules are removed from of , then number of moles of left are
    1. (1)
    2. (2)
    3. (3)
    4. (4)
  23. 83.
    of solution is required to react completely with of oxalic acid solution in acidic medium. The value of is
    1. (1)0.04
    2. (2)0.01
    3. (3)0.03
    4. (4)0.02
  24. 84.
    An organic compound has carbon, hydrogen and remainder is oxygen. If its molecular weight is 342, then its molecular formula is :
    1. (1)
    2. (2)
    3. (3)
    4. (4)
  25. 85.
    Molarity of a given orthophosphoric acid solution is . Its normality is
    1. (1)
    2. (2)
    3. (3)
    4. (4)
  26. 86.
    The equivalent mass of a certain bivalent metal is 20 . The molecular mass of its anhydrous chloride is
    1. (1)91
    2. (2)111
    3. (3)55.5
    4. (4)75.5
  27. 87.
    The density of ' ' solution (' molar) of is , while in molality, the concentration of the solution is (3molal). Then is (Given : Molar mass of is )
    1. (1)3.5
    2. (2)3.8
    3. (3)2.8
    4. (4)3.0
  28. 88.
    250 g solution of D-glucose in water contains 10.8% of carbon by weight. The molality of the solution is nearest to (Given: Atomic Weights are H, lu ; C, 12u; 0,16u)
    1. (1)1.03
    2. (2)2.06
    3. (3)3.09
    4. (4)5.40
  29. 89.
    What volume of a 0.8 M solution contains 100 milli moles of the solute?
    1. (1)100 mL
    2. (2)125 mL
    3. (3)500 mL
    4. (4)62.5 mL
  30. 90.
    atoms of an element weighs . The atomic mass of the element is
    1. (1)23
    2. (2)10
    3. (3)16
    4. (4)35.5