Fundamental Concepts [Set 1]

These are practice mcqs of Fundamental concepts for National MDCAT Chemistry practice. Practice them to test your preparation. In set 1 there are 20 mcqs and 20 minutes time to solve them.

 

Fundamental Concepts [Set 1]

Select the correct option

  

 

1. Avogadro’s number represents the number of:
   1.   Atoms in 1g of helium gas
   2.   Atoms in 24g of Mg
   3.   Molecules in 35.5g of chlorine gas
   4.   Electrons needed to deposit 24g Mg
2. The volume occupied by 1.4g of N2 at STP is:
   1.   2.24 dm3
   2.   1.12 dm3
   3.   112 cm3
   4.   22.4 dm3
3. Which of the following compounds contains the highest percentage by mass of nitrogen?
   
   
   1.   ammonia, NH3
   2.   ammonium carbamate, NH2CO2NH4
   3.   ammonium carbonate, (NH4)2CO3
   4.   hydrazine, N2H4
4. The best standard of atomic mass is
   
   1.   Carbon-12
   2.   Hydrogen-1.008
   3.   Oxygen-16
   4.   Chlorine-35.5
5. Which one of the following terms is not used for ionic compounds?
   1.   Formula unit
   2.   Empirical formula
   3.   Molecular formula
   4.   Formula mass
6. An organic compound contains 49.3% carbon,6.84% hydrogen and its vapour density is 73.Molecular formula of compound is
   1.   C3H5O2
   2.   C6H10O4
   3.   C3H10O2
   4.   C4H10O2
7. A contain 1.2g of diamond. Wow many carbon atoms are in diamond?
   1.   6.20 x 10^23
   2.   3.01 x 10^22
   3.   6.20 x 10^22
   4.   3.10 x 10^23
8. How many carbon atoms are present in 34.2g of sucrose
   (C12H22O11) Mr = 342)?
   1.   6.0 × 10^22
   2.   3.6 × 10^25
   3.   7.2 × 10^23
   4.   3.6 × 10^24
9. Which of the following units of concentration of solution
   change with the increase of temperature?
   I. Molality
   II. Mole Fraction
   III. Molarity
   IV. %age composition (v/v)
   
   1.   I, II
   2.   I, II, III
   3.   III, IV
   4.   II, III
10. The formation of cation is always ______ process named as:
    1.   Exothermic
    2.   Endothermic
    3.   Hetrothermic
    4.   Homothermic
11. The number of moles of sodium hydroxide present in
    2.5dm3 of 0.5M aqueous solution is:
    1.   1.25
    2.   12.5
    3.   0.5
    4.   5.0
12. Which of the following has least mass?
    1.   2 gm atom of nitrogen
    2.   3 x 10^23 atoms of C
    3.   1 mole of S
    4.   7.0 g of Ag
13. What is the molarity of a solution which contains 5.85 g NaCl (M 23 + 35.5) in 100 cm3 solution
    1.   1
    2.   2
    3.   3
    4.   4
14. The amount of products obtained from the balanced chemical equation is regarded as
    1.   theorecal yield
    2.   actual yield
    3.   % yield
    4.   experimental yield
15. What weight of SO2 can be made by burning sulphur is 5 moles of oxygen
    
    1.   640 g
    2.   160 g
    3.   320 g
    4.   80 g
16. Many elements have fractional atomic masses. The reason is that:
    1.   the mass of atom is itself fractional
    2.   atomic masses are average masses of isotopes
    3.   atomic masses are average masses of atoms
    4.   atomic masses are average masses of isotopes which are proportional to their relative abundance
17. What volume of oxygen gas is required for the complete combustion of 5cm3 of ethyne (C2H2)?
    1.   12.5cm3
    2.   13.0cm3
    3.   13.5cm3
    4.   14.0cm3
18. A liming reactant is the one which:
    1.   is taken in lesser quanty in grams as
       compared to other reactants
    2.   is taken in lesser quanty in volume as compared to others
    3.   carries the maximum amount of product which is required
    4.   gives the minimum amount of the product under consideration
19. What is the number of proton in one molecule of SO3 ?
    
    1.   64
    2.   40
    3.   32
    4.   24
20. 
    98g H2SO4 contains number of moles of ions:
    
    
    1.   4.0 moles of ions
    2.   1.0 moles of ions
    3.   2.0 moles of ions
    4.   3.0 moles of ions

About Set 1 MCQ series 

This MCQ test ( Fundamental Concepts ) is a part of Set 1 MCQ series by National mdcat prep (medical entry test). The tests have the following features

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This test series is aimed to provide you with ample mcqs to improve your preparation for mdcat.

The best time to practice these tests is right after you read the chapter from your textbooks. Anyone can take the tests whether you are in fsc or a fresh student or maybe a repeater. There is no restriction.

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