Alkali metals are those elements which belong to group 1 of the modern periodic table.They have one valence electron and that electron enters the s orbital of the ultimate shell.Now let's try out some multiple choice questions regarding them:
1) Which of the following does not belong to the class of alkali metals?
a) Li
b) Na
c) H
d) K
2) The hydroxides formed by group 1 elements on reaction with water are :
a) Acidic
b) Alkaline
c) Amphoteric
d) Neutral
3) Fr-223 has a half-life of :
a) 11 min.
b) 21 min.
c) 31 min.
d) 41 min.
4) Which of the following element among alkali metals show anomalous behaviour?
a) Na
b) K
c) Fr
d) Li
5) Among the alkali metal ions,which one has the largest hydration enthalpy?
a) Li+
b) Na+
c) K+
d) Rb+
6) The density of K is less than that of Na.True or False?
a) True
b) False
7) Match the following :
Element Flame colour
A) Li M) Blue
B) Na N) Crimson red
C) K Q) Yellow
D) Cs P) Violet
a) A-M,B-P,C-O,D-N
b) A-N,B-O,C-M,D-P
c) A-N,B-O,C-P,D-M
d) A-O,B-N,C-P,D-M
8) Which among the following is the alkali metal that directly reacts with N in air to form the corresponding nitride?
a) Rb
b) K
c) Li
d) Na
9) Which superoxide among the following is the most stable one?
a) CsO₂
b) RbO₂
c) KO₂
d) All are equally stable
10) Alkali metals also react with H+ donors such as ROH,gaseous NH₃ and alkynes. True or False?
a) False
b) True
11) All alkali metal hydrides have :
a) Low melting point
b) High melting point
12) Which among the following is more covalent?
a) LiF
b) LiCl
c) LiBr
d) LiI
13) Which is the most powerful reductant among alkali metals?
a) Rb
b) Li
c) K
d) Na
14) The colour imparted by alkali metals to liq NH₃ is :
a) Deep blue
b) Light blue
c) Dark green
d) Light green
15) The superoxides formed by alkali metals are :
a) Paramagnetic
b) Diamagnetic
c) Ferromagnetic
d) Ferrimagnetic
ANSWERS
1) c 2) b 3) b 4) d 5) a 6) a
7) c 8) c 9) a 10) b 11) b 12) d
13) b 14) a 15) a
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