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Chapter 2
S Block Elements
Test - 3
1.
When barium is heated in air or oxygen at 500-600
o
C, its _____________ is formed.
a) Mg
3
N
2
b) (CaSO
4
)
2
.H
2
O
c) Proxide
d) NH
3
2.
3Mg + N
2
®
_______________.
a) Mg
3
N
2
b) (CaSO
4
)
2
.H
2
O
c) NH
3
d) H
2
3.
Mg
3
N
2
+ 6H
2
O
®
2 --------- + 3Mg (0H)
2
a) Higher
b) H
2
c) NH
3
d) Normal
4.
The reaction of KO
2
and CO
2
is as _____________________.
a) (CaSO
4
)
2
.H
2
O
b) NH
3
c) Mg
3
N
2
d) 4KO
2
(s) +2CO
2
(g)
®
2K
2
CO
3
+3O
2
(g)
5.
Chemically Plaster of Paris is _______________.
a) (CaSO
4
)
2
.H
2
O
b) H- (Hydride ion)
c) 4KO
2
(s) +2CO
2
(g)
d) 2K
2
CO
3
+3O
2
(g)
6.
The reaction of an alkali metal oxide is
a) An acid- Base reaction
b) Displacement reaction.
c) Hydrogenation reaction
d) An oxidation-reduction reaction
7.
Alkali metal whose carbonate is relatively less stable and decomposes giving its oxide is
a) Lithium
b) Francium
c) Sodium
d) Potassium
8.
Alkali chloride having exothermic heat of solution is
a) Lithium chloride
b) Potassium chloride
c) Sodium chloride
d) None of these
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