Objective Questions on Carbon and its compounds

Objective Questions on Carbon and its compounds
1-Following is (are) true
(A) All living structures are carbon based
(B) The earth’s crust has only 0.02% carbon
(C) The atmosphere has 0.03% of carbon dioxide
(D) All of the above

2-Following is (are) the property(ies) of ionic compounds.
(A) They have high melting and boiling points
(B) They conduct electricity in solution or in molten state
(C) Both (A) and (B)
(D) None of the above

3-Following has lowest melting point
(A) Acetic acid
(B) Chloroform
(C) Ethanol
(D) Methane

4-Which of the following is true for carbon
(A) It gains four electrons forming C4- anion
(B) It loses four electrons forming C4+ cation
(C) It shares its valence electrons
(D) All of the above

5-The type of bond between two hydrogen atoms is
(A) single
(B) double
(C) triple
(D) any of the above

6-The type of bond between two oxygen atoms is
(A) single
(B) double
(C) triple
(D) any of the above

7-The type of bond between two nitrogen atoms is
(A) single
(B) double
(C) triple
(D) any of the above

8-Methane is a major constituent of
(A) CNG
(B) Bio-gas
(C) Both (A) and (B)
(D) LPG

9-Carbon is
(A) divalent
(B) trivalent
(C) tetravalent
(D) pentavalent

10-Covalent bonds
(A) has low melting and boiling point
(B) are generally poor conductors of electricity
(C) has weak inter-molecular forces
(D) All of the above

ANSWERS:
1-(D), 2-(C), 3-(D), 4-(C), 5-(A), 6-(B), 7-(C), 8-(C), 9-(C), 10-(D)