Chemistry MCQs With Answer by General knowledge Solutions

Chemistry  MCQs With Answer by General knowledge Solutions

1. Which one of the following best defines the word “allotropes”?  
 A Different structural forms of an element
B A pair of substances that differ by H+
C Elements that possess properties intermediate between those of metals and nonmetals
D Atoms of a given atomic number that have a specific number of neutrons
E The different phases (solid, liquid or gas) of a substance

2. How many electrons are there in the valence shell of the O2– ion?  
A 2
B 8
C 10
D 16
E 18


3. What is the formula of the compound formed between magnesium and oxygen?  
A MgO
B Mg2O2
C Mg2O3
D MgO2
E Mg2O

4. Which one of the following statements concerning elements in the Periodic Table is correct? 
 A Elements of the same group all have the same number of electrons in the outermost occupied electron shell.
B Elements of Group 16 occur as cations in ionic compounds.
C Oxides of elements in Groups 16 and 17 are basic.
D The halogens (Group 17) are all gases at room temperature.
E The Group 13 elements are all metals.

5. 222Rn is unstable and decays by losing 6 neutrons and 2 protons. What is the final decay product? 
A 218Bi
B 216Bi
C 216Pb
D 214Po
E 212Tl




6. Which one of the following describes the major intermolecular force in I2(s)? 
A covalent bonds
B ionic bonds
C hydrogen bonds
D dispersion forces
E dipole-dipole forces


7 . How many bonding and non-bonding electron pairs are found in the BF3 molecule?  
A 1 bonding and 3 non-bonding
B 2 bonding and 2 non-bonding
C 3 bonding and 1 non-bonding
D 3 bonding and 0 non-bonding
E 4 bonding and 0 non-bonding

8. Which one of the following pairs of atoms would form a non-polar covalent bond?  
A C and O
B N and O
C Cl and Cl
D Na and Cl
E Ne and Ne


9. Which one of the following elements has valence electrons in the n = 3 shell?  
A beryllium
B oxygen
C silicon
D neon E hydrogen

10. Which one of the following species contains a polar covalent bond? 
A oxygen
B carbon dioxide
C sodium chloride
D magnesium fluoride
E helium