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]

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

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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