Some Basic Concepts Of Chemistry Level-2 Exam

30 Questions | Total Attempts: 31

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Some Basic Concepts Of Chemistry Level-2 Exam

This exam contains total 30 questions. For each correct answer you will be awarded +4 marks. For each wrong answer -1 marks will be deducted. For non-attempted questions, you will be given 0 marks. Choose your answers wisely because of NEGATIVE MARKING. Review yours answers before submitting. Time Allotted is 1 hour. Manage time effectively.


Questions and Answers
  • 1. 
    The molarity of solution obtained by mixing 200 mL 0.1 M HCl with 300 mL 0.2 M HCl solution will be -
    • A. 

      0.08 M

    • B. 

      0.20 M

    • C. 

      0.06 M

    • D. 

      0.16 M

  • 2. 
    A gaseous hydrocarbon gives upon combustion, 0.72 g H2O and 3.08 g CO2. The empirical formula of the hydrocarbon is-
    • A. 

      C2H4

    • B. 

      C3H4

    • C. 

      C6H5

    • D. 

      C7H8

  • 3. 
    Number of atoms in 560 g Fe (atomic mass of Fe = 56 g/mol) is
    • A. 

      Twice that of 70 g N

    • B. 

      Half that of 20 g H

    • C. 

      Both (a) and (b)

    • D. 

      None of these

  • 4. 
    Given P = 0.0030 m , Q = 2.40 m , R = 3000 m . The significant figures for P,Q and R are respectively
    • A. 

      2, 2, 1

    • B. 

      2, 3, 4

    • C. 

      4, 2, 1

    • D. 

      4, 2, 4

  • 5. 
    The element chlorine consists of a mixture of 75.53 % 17Cl35 and 24.47 % 17Cl37 having masses of 34.97 amu and 36.95 amu respectively. The atomic weight of chlorine is
    • A. 

      35.25

    • B. 

      35.45

    • C. 

      36.25

    • D. 

      36.45

  • 6. 
    A reaction is given as follows: SnO2 + C →  Sn + CO Its balanced form will involve
    • A. 

      2C and 2CO

    • B. 

      C and 3CO

    • C. 

      C and 2CO

    • D. 

      2C and CO

  • 7. 
    Cl2 reacts completely with 0.4 gram H2 to yield HCl. The amount of HCl formed is-
    • A. 

      7.3 grams

    • B. 

      10.7 grams

    • C. 

      14.4 grams

    • D. 

      16.7 grams

  • 8. 
    The maximum number of molecules is present in-
    • A. 

      5 L of N2 gas at STP

    • B. 

      0.5 g of H2 gas

    • C. 

      10 g of O2 gas

    • D. 

      15 L of H2 gas at STP

  • 9. 
    Volume occupied by one molecule of water (density = 1 g/cm3) is-
    • A. 

      3.0 x 10-23 cm3

    • B. 

      5.5 x 10-23 cm3

    • C. 

      9.0 x 10-23 cm3

    • D. 

      6.023 x 10-23 cm3

  • 10. 
    10 g of hydrogen and 64 g of oxygen were filled in a steel vessel and exploded. Amount of water produced in this reaction is-
    • A. 

      1 mol

    • B. 

      2 mol

    • C. 

      3 mol

    • D. 

      4 mol

  • 11. 
    The number of atoms in 0.1 mol of a triatomic gas is ( NA = 6.02 x 1023 mol-1)
    • A. 

      1.800 x 1022

    • B. 

      6.026 x 1022

    • C. 

      1.806 x 1023

    • D. 

      3.600 x 1023

  • 12. 
    Which has the maximum number of molecules among the following-
    • A. 

      64 g SO2

    • B. 

      44 g CO2

    • C. 

      48 g O3

    • D. 

      8 g H2

  • 13. 
    How many moles of magnesium phosphate Mg3(PO4)2 will contain 0.25 mole of oxygen atoms?
    • A. 

      2.5 x 10-2

    • B. 

      0.02

    • C. 

      3.125 x 10-2

    • D. 

      1.25 x 10-2

  • 14. 
    Which of the following pairs of compounds illustrates the law of multiple proportions?
    • A. 

      H2O , Na2O

    • B. 

      MgO , Na2O

    • C. 

      Na2O , BaO

    • D. 

      SnCl2 , SnCl4

  • 15. 
    In the reaction N2 + 3H2 → 2NH3 Ratio by volume of N2, H2 and NH3 is 1:3:2. This illustrates law of-
    • A. 

      Definite proportion

    • B. 

      Multiple proportion

    • C. 

      Reciprocal proportion

    • D. 

      Gay Lussac

  • 16. 
    When 100 g of ethylene polymerizes to polythene according to the equation- n CH2=CH2 → -(-CH2 - CH2 -)n The weight of polythene produced will be-
    • A. 

      N/2 grams

    • B. 

      100 grams

    • C. 

      100/n grams

    • D. 

      100n grams

  • 17. 
    Vapour density of ammonia is 8.5,  85 grams of NH3 at STP will occupy-
    • A. 

      22.4 litre

    • B. 

      112 litre

    • C. 

      224 litre

    • D. 

      1120 litre

  • 18. 
    If 3.01 x 1020 molecules are removed from 98 mg of H2SO4, then the number of moles of H2SO4 left are-
    • A. 

      0.1 x 10-3

    • B. 

      0.5 x 10-3

    • C. 

      1.66 x 10-3

    • D. 

      9.95 x 10-2

  • 19. 
    The total number of ions present in 1 mL of 0.1 M barium nitrate Ba(NO3)2 solution is-
    • A. 

      6.02 x 1018

    • B. 

      7.2 x 1021

    • C. 

      3.0 x 6.02 x 1019

    • D. 

      3.0 x 6.02 x 1018

  • 20. 
    A person adds 1.71 gram of sugar (C12H22O11) in order to sweeten his tea. The number of carbon atoms added are- (Molecular mass of sugar = 342 g/mol)
    • A. 

      3.6 x 1022

    • B. 

      7.2 x 1021

    • C. 

      0.05

    • D. 

      6.6 x 1022

  • 21. 
    In a gaseous reaction of the type- aA + bB → cC + dD Identify the wrong statement.
    • A. 

      A litre of A combines with b litre of B to give C and D

    • B. 

      A mole of A combines with b mole of B to give C and D

    • C. 

      A gram of A combines with b gram of B to give C and D

    • D. 

      A molecules of A combines with b molecules of B to give C and D

  • 22. 
    A compound is found to contain 80% carbon and 20% hydrogen. Which of the following is that compound?
    • A. 

      C6H6

    • B. 

      C2H5OH

    • C. 

      C2H6

    • D. 

      C2H4

  • 23. 
    For the reaction given below- A  +  2B  →  C 5 moles of A and 8 moles of B will produce -
    • A. 

      5 moles of C

    • B. 

      4 moles of C

    • C. 

      8 mole of C

    • D. 

      13 mole of C

  • 24. 
    Molecular weight of tribasic acid is W. Its equivalent weight will be-
    • A. 

      W/2

    • B. 

      W/3

    • C. 

      W

    • D. 

      3W

  • 25. 
    According to the following reaction- 2Al + 1.5O2  →   Al2O3 9 gms of Al will react completely with-
    • A. 

      6 gms of O2

    • B. 

      8 gms of O2

    • C. 

      9 gms of O2

    • D. 

      4 gms O2

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