Equal length of magnesium ribbon are taken in two test tubes ‘A’ and ‘B. Sulphuric acid is added to test tube ‘A’ and carbonic acid in the test tube ‘B’ in equal amounts:
(a) Identify the test tube showing vigorous reaction.
class 10
Answers
Answer:
ANSWER
a) H
2
SO
4
test tube i.e A will show more rigorous reactions
b) Since acidic strength of H
2
SO
4
is more than H
2
CO
3
c) Mg+H
2
SO
4
→MgSO
4
+H
2
(g)
Mg+H
2
CO
3
→MgCO
3
+H
2
(g)
The liberated gas is H
2
and it burns with popping sound.
d) Mg+H
2
SO
4
→MgSO
4
+H
2
(g)
Mg+H
2
CO
3
→MgCO
3
+H
2
(g)
e)
i) Since H
2
SO
4
is more acidic, it will have lower pH value.
ii) Test tube B will have lower H
+
concentration as H
2
CO
3
is a weak acid.
a) in test tube A vigorous reaction will be seen
b)as H2SO4 is more reactive than carbonic acid i. e. H2CO3.
c)H2 gas will be liberated in test tube A and CO2 in test tube B. We can prove the gas liberated by bringing a burning candle near the mouth of both the test tubes, it will burn with a popping sound.
d)Mg + H2SO4 gives MgSO4 + H2
Mg + H2CO3 gives. MgCO3 + H2
e)i) H2CO3
ii) H2CO3
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