Free online Chemistry Test for Exams containing Solved Questions

Free online Chemistry Test for Exams containing Solved Questions
Very useful for medical entrance Tests like PMT as well as Engineering Entrance Tests Like AIEEE


1. Noble gases exist as individual
(a) Atoms
(b) Molecules
(c) Ions
(d) Compounds
Ans. (a)


2. Electropositive atoms tend to form
(a) Negative ions
(b) Positive ions
(c) Covalent bonds
(d) Metallic bonds
Ans. (b)


3. Electrovalent compounds are usually
(a) Solids with low melting points solids with
(b) High melting points
(c) Volatile liquids
(d) Organic compounds



4. In electrovalence
(a) Molecules lose electrons forming atoms
(b) Molecules gain electrons forming atoms
(c) Atoms share electrons
(d) Atoms lose or gain electrons forming ions
Ans. (d)


5. A double bond between two carbon atoms is formed by
(a) The transfer of two electrons from one carbon atom to the other
(b) The transfer of one electron from one carbon atom to the other
(c) Two shared electron pairs
(d) The sharing of two electrons
Ans. (c)

6. Which of the following is a non-polar molecule?
(a) NH3
(b) HC1
(c) CCl4
(d) H2O
Ans. (c)

7. The bonding in ammonium chloride
(a) is covalent only
(b) is electrovalent only
(c) Consists of three covalent nitrogen- hydrogen bonds and an electrovalent bond between the ammonia molecule and the chlorine atom.
(d) Consist of four covalent nitrogen-hydrogen bonds and one electrovalent bond between the ammonium ion and chloride ion.
Ans. (d)

8. Which amongst the following has smallest size?
(a) Na
(b) Al
(c) Na+
(d) Al3+
Ans. (d)


9. Which amongst the following can lose 2 electrons to acquire the configuration of argon?
(a) N
(b) Mg
(c) Ca
(d) Be
Ans. (c)


10. Two electronegative atoms combine to form
(a) Ionic bond
(b) Covalent bond
(c) Coordinate bond
(d) Can’t be predicted
Ans. (b)


11. An element with low ionization energy combines with an element having high electron affinity to form
(a) Ionic bond
(b) Covalent bond
(c) Dative bond
(d) None of these
Ans. (a)


12. The actual formula of sodium chloride is
(a) NaC1
(b) Na+ C1-
(c) (Na+ Cl-)n
(d) NanCln
Ans. (c)

13. Which of these has a triple covalent bond?
(a) PH3
(b) CO2
(c) A1C13
(d) C2H2
Ans. (d)

14. The number of covalent bonds in ethylene is
(a) 2 double bonds, 2 single bonds
(b) 2 double and 4 single bonds
(c) 2 single and 2 double bonds
(d) 1 double and 4 single bonds
Ans. (d)

15. When an alkali metal combines with halogen, it will form
(a) Always covalent bond
(b) Always ionic bond
(c) May be covalent or ionic
(d) Will not combine at all
Ans. (b)

16. An element ‘X’ belongs to group 11 while an element ‘Y’ belongs to group 17 of the periodic table. They are expected to form
(a) An ionic compound with formula X Y
(b) An ionic compound with formula XY2
(c) A covalent compound with formula XY2
(d) A covalent compound with formula X2Y
Ans. (b)

17. Which amongst the following will not conduct electricity?
(a) NaC1
(c) CaF2
(b) MgC12
(d) C6H12O6
Ans. (d)

18. Which amongst the following has a polar covalent bond?
(a) NaC1
(b) NH3
(c) O2
(d) CaO
Ans. (b)