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Class 11 NEET Chemistry Some Basic Concepts Of Chemistry
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© examsnet.com
Question : 4
Total: 60
1 gram of sodium hydroxide was treated with
25
mL
of
0.75
M
HCl
solution, the mass of sodium hydroxide left unreacted is equal to
[NEET 2024]
750
mg
250
mg
Zero mg
200
mg
Validate
Solution:
👈: Video Solution
M
=
W
×
1000
M
2
×
V
(
in
mL
)
W
=
M
×
M
2
×
V
(
in
mL
)
1000
=
0.75
×
36.5
×
25
1000
=
0.684
g
(
Mass of
HCl
)
HCl
36.5
g
+
NaOH
40
g
→
HCl
+
NaOH
36.5
g
HCl
reacts with
NaOH
=
40
g
0.684
g
HCl
reacts with
NaOH
=
40
36.5
×
0.684
≈
0.750
g
Amount of
NaOH
left
=
1
g
−
0.750
g
=
0.250
g
=
250
mg
© examsnet.com
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