sulphuric acid preparation and properties icse classX

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BY RAJIV JAIN

2. THOUGHT FOR THE SESSION

3. THOUGHT FOR THE SESSION

4. SULPHURIC
ACID

5. USES OF SULPHURIC ACID

6. CONTACT PROCESS –COMMERCIAL

7. CONTACT PROCESS REACTIONS

8. SUMMARY OF ALL COMMERCIAL
PROCESSES

9. IMPORTANT PROPERTIES OF
SULPHURIC ACID
 ACIDIC PROPERTY
 NON-VOLATILE ACID
 OXIDISING AGENT
DEHYDRATING AGENT

11. IMPROTANT REACTIONS OF
SULPHURIC ACID

12. OXIDISING ACTION OF SULPHURIC
ACID

14. Important
Q & A

15. Q1. Identify the acid which matches the
following description:
(i) The acid which produces sugar charcoal;
from sugar.
Ans. concentrated sulphuric acid
(ii) The acid on mixing with lead nitrate
solution produces a white precipitate which
is insoluble even on heating.
Ans . sulphuric acid

16. Q2. Write balanced equations for
the following: Action of
concentrated sulphuric acid on
carbon.
Ans2. C +2H2SO4 (conc) 
CO2+2SO2+2H2O
Q3. Give one equation each to show the
following properties of sulphuric acid:
(i) Dehydrating property
Ans (i) C12H22O11+ H2SO4 (conc) 
12C+ 11H2O

17. Q3. Give one equation each to show
the following properties of
sulphuric acid:
(ii) Acidic nature
Ans Na2SO3+H2SO4
Na2SO4+H2O + SO2
(iii) As a non-volatile acid
Ans NaCl +H2SO4 (conc)T <2000C
 NaHSO4+HCl

18. Q4 (i) Dehydration of concentrated
sulphuric acid with sugar crystals.
Ans 4 (i)
C12H22O11+ H
2
SO
4
(conc) 
12C+ 11H2O
Q5. (i) The gas produced on reaction of
dilute sulphuric acid with a metallic
sulphide.
Ans 5(i) hydrogen sulphide

19. Q6. Write the equation for each of the
following reactions
(i) Sulphur is heated with concentrated
sulphuric acid
Ans.6 (i)
S +2H2SO4 (conc)  3SO2+2H2O
(ii) Concentrated sulphuric acid is poured
over sugar.
Ans6(ii). C12H22O11+ H
2
SO
4
(conc) 
12C+ 11H2O

20. Q7. The following question refers to the scheme given
below. Write one chemical equation in each case for a
reaction which could bring about each of the changes
A,B,C and B
S+ O2 (A )  SO2
SO2 + 2NaOH (C)  Na2SO3 + H2O
Na2SO3 + HCl (D ) 2 NaCl + H2O + SO2
SO2 +2H2  2H2O + S

21. Q8. Write the chemical equation
when:
(i) S reacts with metal
(ii) S reacts with non metal.
Ans. S + Fe  FeS
S + O2  SO2
Q9. Which concentrated acid will oxidize
sulphur to sulphuric acid?
Ans9. Concentrated Nitric acid

22. Q10. Name the process used to prepare
sulphuric acid? Name the catalyst used.
Ans10. Contact process, vanadium
pentoxide
Q11. Concentrated sulphuric acid is used in
laboratory preparation of __________ acid
from potassium nitrate and _______ acid
from sodium chloride. Because it
__________ (less volatile/ stronger) in
comparison to these to acids.
Ans11. Nitric acid , hydrochloric acid, Less
volatile

23. Q12. Dilute hydrochloric acid and dilute
sulphuric acid are both colorless solution.
How will you distinguish between two by
using barium chloride.
BaCl2 + H2SO4 
BaSO4 ↓(white)+ 2HCl
Q13. Write reaction which proves the
oxidizing agent nature of conc. Sulphuric
acid.
Zn +2H2SO4 (conc) 
ZnSO4 + SO2 + 2H2O

24. Q14. A, B, C and D summarises the properties of
sulphuric acid depending on whether it is dilute
or concentrated.
A= Typical acid property B= Non- volatile acid
C= Oxidising agent D= Dehydrating agent
Choose the property (A, B, C or D)
(i) Preparation of hydrogen chloride gas.
Ans. B
(ii) Preparation of copper sulphate from copper
oxide Ans. A
(iii) Action of conc. sulphuric acid on sulphur.
Ans. C

25. Q15. Answer the following:
(i) In contact process why Sulphur trioxide is
not dissolved in water?
It forms misty drops with water which
leads to poor visibility and difficulty in
breathing.
(ii) Write balanced reaction when Zinc is
treated with the final product of contact
process.
Zn +2H2SO4 (conc) 
ZnSO4+SO2+2H2O

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