Exams Net
Unrestricted Exams Practice
Home
Exams
Banking
CUET
Defence
Engineering
Finance
GATE
Insurance
International
JEE
LAW
MBA
MCA
Medical
Other
Police
PSC
RRB
SSC
State Govt
Subjectwise
Teacher
SET Exams
UPSC
Aptitude
Algebra and Higher Mathematics
Arithmetic
Commercial Mathematics
Data Based Mathematics
Geometry and Mensuration
Number System and Numeracy
Problem Solving
Board Exams
Andhra
Bihar
CBSE
Gujarat
Haryana
ICSE
Jammu and Kashmir
Karnataka
Kerala
Madhya Pradesh
Maharashtra
Odisha
Tamil Nadu
Telangana
Uttar Pradesh
English
Competitive English
CBSE
CBSE Class 10 Solutions
CBSE Class 12 Solutions
CBSE Question Papers (Pdf)
NCERT Books (Pdf)
NCERT Exemplar Books (Pdf)
NCERT Study Notes (Pdf)
CBSE Study Concepts (Pdf)
NCERT Text Book Class 11 Solutions
NCERT Text Book Class 12 Solutions
ICSE Class 10 Papers
Certifications
Technical
Cloud Tech Certifications
Security Tech Certifications
Management
IT Infrastructure
More
About
Contact Us
Our Apps
Privacy
+
-
Test Index
Solutions Part 2
Show Para
Hide Para
Section:
Chemistry
Share question:
© examsnet.com
Question : 39 of 95
Marks:
+1
,
-0
1.24
g
of
A
X
2
1.24\,\mathrm{g}^{\text{of}}\,\mathrm{AX}_2
1.24
g
of
AX
2
(molar mass
124
g
m
o
l
−
1
124\,\mathrm{g}\,\mathrm{mol}^{-1}
124
g
mol
−
1
) is dissolved in 1 kg of water to form a solution with boiling point of
100.015
6
∘
C
100.0156^{\circ}\,\mathrm{C}
100.015
6
∘
C
, while 25.4 g of
A
Y
2
\mathrm{AY}_2
AY
2
(molar mass
250
g
m
o
l
−
1
250\,\mathrm{g}\,\mathrm{mol}^{-1}
250
g
mol
−
1
) in 2 kg of water constitutes a solution with a boiling point of
100.026
0
∘
C
100.0260^{\circ}\,\mathrm{C}
100.026
0
∘
C
.
K
b
(
H
2
O
)
=
0.52
K
k
g
m
o
l
−
1
K_{\mathrm{b}} (\mathrm{H}_2\mathrm{O}) = 0.52\,\mathrm{K}\,\mathrm{kg}\,\mathrm{mol}^{-1}
K
b
(
H
2
O
)
=
0.52
K
kg
mol
−
1
Which of the following is correct?
[29 Jan 2025 Shift 1]
A
X
2
\mathrm{AX}_2
AX
2
and
A
Y
2
\mathrm{AY}_2
AY
2
(both) are fully ionised
A
X
2
\mathrm{AX}_2
AX
2
is fully ionised while
A
Y
2
\mathrm{AY}_2
AY
2
is completely unionised
A
X
2
\mathrm{AX}_2
AX
2
and
A
Y
2
\mathrm{AY}_2
AY
2
(both) are completely unionised
A
X
2
\mathrm{AX}_2
AX
2
is completely unionised while
A
Y
2
\mathrm{AY}_2
AY
2
is fully ionised
Validate
Solution:
For
A
X
2
\mathrm{AX}_2
AX
2
Δ
T
b
=
i
K
b
m
\Delta T_{\mathrm{b}} = i K_{\mathrm{b}} m
Δ
T
b
=
i
K
b
m
0.0156
=
i
×
0.52
×
1.24
124
×
1
0.0156 = i \times 0.52 \times \frac{1.24}{124 \times 1}
0.0156
=
i
×
0.52
×
124
×
1
1.24
3
=
i
3 = i
3
=
i
3
=
1
+
2
α
3 = 1 + 2 \alpha
3
=
1
+
2
α
1
=
α
1 = \alpha
1
=
α
For
A
Y
2
\mathrm{AY}_2
AY
2
Δ
T
b
=
i
K
b
m
\Delta T_{\mathrm{b}} = i K_{\mathrm{b}} m
Δ
T
b
=
i
K
b
m
0.0260
=
i
×
0.52
×
25.4
250
×
2
0.0260 = i \times 0.52 \times \frac{25.4}{250 \times 2}
0.0260
=
i
×
0.52
×
250
×
2
25.4
i
≈
1
i \approx 1
i
≈
1
∴
A
X
2
\therefore \mathrm{AX}_2
∴
AX
2
is completely ionised &
A
Y
2
\mathrm{AY}_2
AY
2
is completely unionised
© examsnet.com
Go to Question:
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
Prev Question
Next Question
More Free Exams
AIEEE Previous Papers
BITSAT Exam Previous Papers
JEE Adv
JEE Advanced Model Papers
JEE Advanced Previous Papers
JEE Main PYQ
JEE Mains Model Papers
VITEEE Previous Papers