18. TEST FOR AMMONIA
Moist red LITMUS blue /
INIDCATOR/ pH test
Pungent smell
Dense white fumes with HCl
It turns colorless nessler’s reagent
to brown
19. Q1. The gas used as reducing agent in
reducing copper oxide to copper.
Ans1. Ammonia
Q2. Write balanced chemical equations:
Lab preparation of ammonia from
ammonium salts.
ANS 2. NH4Cl + Ca(OH)2
CaCl2 + NH3 + 2H2O
21. (III) Reaction of ammonia with
sulphuric acid.
ANS2 (III) 2 NH3 + H2SO4
(NH4)2SO4
(IV) Action of warm water on
magnesium nitride.
ANS (IV) Mg3N2 + 6 H2O
3Mg(OH)2 + 2NH3
22. Q3. (i) Ammonium nitrate is not
used in the preparation of
ammonia because
ANS3 (I) It is explosive in nature
(ii) drying agent during the
process.
ANS3 (II) Calcium oxide
23. (iii) How is ammonia gas
collected?
Ans 3(IV) Downward
displacement of air.
(iv) Explain why it is not collected
over water.
ANS3(IV) Because it is highly
soluble in water.
24. Q4. The diagram shows an experimental set up for the lab
preparation of a pungent smelling gas. The gas is alkaline
in nature.
(i) Name the gas collected in the jar.
ANS 4. ammonia
(ii) Write the balanced equation for the above preparation.
Ans 4 (ii) NH4Cl + Ca(OH)2 CaCl2 + NH3 +
2H2O
25. Q4How is the gas being collected?
ANS4(iii). Downward displacement of air.
(iv)Name the drying agent used.
ANS 4(iv). Quick lime
(v) How will you find that the jar is full of gas?
ANS 4 (v) Bring a rod dipped in hydrogen chloride. Dense
white fumes gives white ppt.
26. Q5. Ammonia can be obtained by adding
water to:
(A) Ammonium chloride.
(B) Ammonium nitrate.
(C) Magnesium nitride.
(D) Magnesium nitrate.
ANS5 (d). Magnesium nitride.
Q6. Identify the following
substances: (i) An alkaline gas A,
which gives dense white fumes with
hydrogen chloride.
ANS 6 (i) Ammonia
27. Q7. Copy and complete the
following table relating to
important industrial
processes. Output refers to
the product of the process
not the intermediate steps.
28. Name of
Process
Inputs Catalyst Equation
for
catalyzed
reaction
Output
Haber
Process
Ammonia
+ Air
Platinum Nitric
acid
Contact
Process
Sulphur
dioxide +
oxygen
Vanadium
peñtoxide
29. Name of
Process
Inputs Catalyst Equation
for
catalyzed
reaction
Output
Haber
Process
Hydrogen
+nitrogen
Finely
divided
iron
N2 + 3H2
2NH3
Ammonia
Ostwald
process
Ammonia
+ Air
Platinum 4NH3+5O
2 4NO+
6H2O
Nitric acid
Contact
Process
Sulphur
dioxide +
oxygen
Vanadium
pentoxide
2SO2 +O2
SO3
Sulphuric
acid
30. Q8. Write a balanced equation in
which ammonia is oxidised by:
(i) A metal oxide; (reducing agent
property of ammonia)
3CuO + 2NH3
3 Cu + N2 + 3H2O
(ii) A gas which is not oxygen.
3Cl2 (excess) +8NH3
6 NH4Cl + N2
31. Q9. (i) Name the substance used for
drying ammonia.
ANS 9. Calcium oxide or lime
(ii) Write an equation to illustrate
the reducing nature of ammonia.
Ans 9(ii) 3CuO + 2NH3 3 Cu
+ N2 + 3H2O
Copper oxide (black) is reduced to
copper (brown color metallic
copper)
32. Q9. With reference to Haber’s process
for the preparation of ammonia,
write the equation and the
conditions required.
ANS. N2 + 3H2 2NH3
T= 450 0C, 200 atm,
finely divided iron
Prmoter: molybdenum
33. Q10. Write the balanced chemical
equation:
(i) A mixture of ammonium
chloride and slaked lime is
heated.
NH4Cl + Ca(OH)2 CaCl2 +
NH3 + 2H2O
(ii) Aluminium nitride and water.
AlN + 3 H2O Al(OH)3 +
NH3
34. Q11. The following reaction is carried
out:
A: Nitrogen + metal compound X
B: X + water ammonia + other
compound.
C: Ammonia + metal oxide metal +
water + N2
The one metal which can be used in
reaction A is
Ans. Magnesium.
35. Q11b . The following reaction is carried out:
A: Nitrogen + metal compound X
B: X + water ammonia + other compound.
C: Ammonia + metal oxide metal + water +
N2
(a)State the condition for the reaction
Ans red hot / high temperature
(b) write the formula of the compound X.
Heating
Ans Magnesium hydroxide
(c) What property is demonstrated by reaction
C.
Ans. Reducing agent
36. Q12. Write equations for the
following reactions:
(i) Burning of ammonia in
oxygen
Ans. 4NH3 + 3O2 2N2 + 6H2O
(ii) Catalytic oxidation of
ammonia
Ans. 4NH3+5O2 Pt 4NO+ 6H2O
37. Q13.(i) What do you observe when ammonia
reacted with oxygen in absence of catalyst?
Ans. Greenish yellow flame
(ii) Name the catalyst used.
Ans. platinum
(iii) In the reaction, the catalyst glows red
hot. Why ?
Ans. because reaction takes place at high
temperature.
(iv) What is the name of the industrial
process?
Ans. Ostwald process
38. Q14. What do you observe when
ammonia gas is bubbled through red
litmus solution?
Ans14. Red litmus solution changes to
blue.
Q15. Write a balanced chemical
equation when solution of ammonium
chloride and sodium hydroxide are
mixed and heated.
Ans15.
NH4Cl + NaOH NaCl + H2O + NH3
39.
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