Q.1 When elements of group II-A (alkaline earth metals) are exposed to air, they quickly
become coated with a layer of oxide. What is the purpose of this oxide layer?
A) The oxide layer exposes the metal to Atmospheric attack
B) The oxide layer increases the reactivity of metal
C) The oxide layer protects the metal from further atmospheric attack
D) The oxide layer gives the metal a shiny silvery appearance
Q.2 In silicon dioxide each silicon atom is tetrahedrally bonded to four oxygen atoms and
each oxygen atom is bonded to two silicon atoms. The ratio of silicon to oxygen atoms is:
A) 2:2 C) 2:1
B) 1:2 D) 1:4
become coated with a layer of oxide. What is the purpose of this oxide layer?
A) The oxide layer exposes the metal to Atmospheric attack
B) The oxide layer increases the reactivity of metal
C) The oxide layer protects the metal from further atmospheric attack
D) The oxide layer gives the metal a shiny silvery appearance
Q.2 In silicon dioxide each silicon atom is tetrahedrally bonded to four oxygen atoms and
each oxygen atom is bonded to two silicon atoms. The ratio of silicon to oxygen atoms is:
A) 2:2 C) 2:1
B) 1:2 D) 1:4
Q.3 Alkaline earth metal hydroxides decompose on heating. Which of the following reactions is a correct representation of this decomposition?
A) M(OH)2(s) MO(s) + H2O(l) C) 2MOH2(s) 2MO(s) + H2(l)
B) MOH(s) M2O(s) + H2O(l) D) 4MOH(s) 4M(s) + 2H2O(l) + O2
Q.4 Carbon has the unique ability to form long chains by bonding with other carbon atoms. This property of self-linking in carbon is known as:
A) Condensation C) Cyclization
B) Polymerization D) Catenation
A) M(OH)2(s) MO(s) + H2O(l) C) 2MOH2(s) 2MO(s) + H2(l)
B) MOH(s) M2O(s) + H2O(l) D) 4MOH(s) 4M(s) + 2H2O(l) + O2
Q.4 Carbon has the unique ability to form long chains by bonding with other carbon atoms. This property of self-linking in carbon is known as:
A) Condensation C) Cyclization
B) Polymerization D) Catenation
Q.5 Alkaline earth metal oxides react with water to give hydroxides. The solubility of alkaline earth metal oxides in water increases as we move from top to bottom in a group. Which of the following alkaline earth metal oxides is least soluble in water?
A) MgO C) BaO
B) CaO D) SrO
A) MgO C) BaO
B) CaO D) SrO