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Byju's Answer
Standard XII
Chemistry
Reactivity with Air CO2 and Water (Group 1)
Find the numb...
Question
Find the number of chloride(s) which do not impart
color to the flame from the following :
B
e
C
l
2
,
S
r
C
l
2
,
M
g
C
l
2
,
C
a
C
l
2
,
B
a
C
l
2
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Solution
Two chlorides
B
e
C
l
2
and
M
g
C
l
2
do not impart color to the flame due to high ionization energy of
B
e
and
M
g
which results in high excitation energy.
The chlorides
S
r
C
l
2
,
C
a
C
l
2
and
B
a
C
l
2
impart characteristic color to the flame.
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Similar questions
Q.
Which of the following orders of alkaline-earth metal chlorides are correct:
(a) covalent nature :
R
a
C
l
2
<
B
a
C
l
2
<
S
r
C
l
2
<
C
a
C
l
2
<
M
g
C
l
2
<
B
e
C
l
2
(b) melting point :
B
e
C
l
2
<
M
g
C
l
2
<
C
a
C
l
2
<
S
r
C
l
2
<
B
a
C
l
2
<
R
a
C
l
2
(c) lattice energy :
R
a
C
l
2
<
B
a
C
l
2
<
S
r
C
l
2
<
C
a
C
l
2
<
M
g
C
l
2
<
B
e
C
l
2
(d) thermal stability :
R
a
C
l
2
<
B
a
C
l
2
<
S
r
C
l
2
<
C
a
C
l
2
<
M
g
C
l
2
<
B
e
C
l
2
Q.
The correct sequence of increasing melting point of
B
e
C
l
2
,
M
g
C
l
2
,
C
a
C
l
2
,
S
r
C
l
2
and
B
a
C
l
2
is
Q.
Match the chlorides given in figure above with the colour they impart on ignition in flame:
Salt
Colour
1.
C
a
C
l
2
(A)
Apple green
2.
S
r
C
l
2
(B)
Brick red
3.
B
a
C
l
2
(C)
Crimson red
Q.
Arrange the following properties in the increasing order.
Lattice energy :
B
e
C
l
2
,
M
g
C
l
2
,
C
a
C
l
2
,
S
r
C
l
2
Q.
Considering
B
e
C
l
2
,
M
g
C
l
2
,
C
a
C
l
2
and
B
a
C
l
2
predict which of the following statement is true?
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