final revision of class X icse

1. YOU TUBE CHANNEL:
KNOW THE CHEMISTRY
BY RAJIV JAIN

2. THOUGHT FOR THE SESSION

3. ACIDS,
BASES AND
SALTS

11. pH of salt solution

13. Methods of preparation of salts

15. Sodium bicarbonate salt

16. Salt preparation of ?

17. Water of crystallization

18. No water of crystallization
 SODIUM CHLORIDE (NaCl)
 NITRE (KNO3)
SUGAR
 POTASSIUM PERMANGANTAE
 AMMONIUM CHLORIDE

21. Solubility variation with temperature

23. What is the drying agent in
ammonia preparation?

24. Which is the drying agent used in lab
preparation of Hydrogen chloride?

25. Q1. Choose the most appropriate
from the following list of oxides
which fit the description.
[SO2, SiO2, Al2O3, MgO, CO,
Na2O]
(i) A basic oxide :
ANS. MgO
(ii) An oxide which dissolves in
water forming an acid. :
ANS. SO2

26. Q1. Choose the most appropriate
from the following list of oxides
which fit the description.
[SO2, SiO2, Al2O3, MgO, CO,
Na2O]
(iii) An amphoteric oxide :
Al2O3
(iv) A covalent oxide of a metalloid:
SiO2

27. Q2. From the list of the following
salts that most appropriate fit
the description given in the
following: [ AgCl, MgCl2,
NaHSO4, PbCO3, ZnCO3,
KNO3, Ca(NO3)2]
(i) A deliquescent substance:
MgCl2
(ii) An insoluble chloride: AgCl

28. Q2. From the list of the following salts
that most appropriate fit the description
given in the following:
[ AgCl, MgCl2, NaHSO4, PbCO3,
ZnCO3, KNO3, Ca(NO3)2]
(iii) On heating, this salt gives a yellow
residue when hot and white when cold:
ANS ZnCO3
(iv) On heating this salt, a brown colored
gas is evolved:
ANS Ca(NO3)2.

29. Q3. Basicity of acetic acid is _____ (3,1,4,)
ANS. 1
Q4. Give balanced chemical equations to
prepare the following salts:
(i) Lead sulphate from lead carbonate
PbCO3 + 2HNO3  Pb(NO3)2 +
H2O+CO2
Pb(NO3)2 + H2SO4  PbSO4 +
2HNO3

30. Q4. Give balanced chemical equations to
prepare the following salts:
(ii) sodium sulphate using dilute
sulphuric acid
2NaOH + H2SO4  Na2SO4 + H2O
(iii) Copper chloride using copper
carbonate
CuCO3 + 2HCl  CuCl2 + H2O +
CO2

31. Q5. (i) [ammonia, ammonium, carbonate,
carbon dioxide, hydrogen, hydronium,
hydroxide, precipitate, salt, water]:
(i) A solution M turns blue litmus red, so it
must contain (i)_______ions ;
hydronium ions
another solution O turns red litmus blue
and hence, must contain (ii) _____ions.
hydroxide ions.
(ii) When solutions M and O are mixed
together, the products will be (iii) ____
and (iv) _____
ANS. salt and (iv) water

32. Q5. (iii) If a piece of
magnesium was put
into a solution M, (v)
_______ gas would be
evolved.
ANS5 . hydrogen gas

33. Q6. Give suitable chemical terms for the
following:
(i) A salt formed by incomplete
neutralisation of an acid by a base.
ANS. acidic salt
(ii) A definite number of water
molecules bound to some salts.
Water of crystallisation

34. Q6. Give suitable chemical terms for the
following:
(iii) The process in which a substance
absorbs moisture from the atmospheric
air to become moist, and ultimately
dissolves in the in the absorbed water.
Deliquescent substance

35. Q7. Identify the metallic
oxide which is amphoteric
in nature:
(A) Calcium oxide
(B) Barium oxide
(C) Zinc oxide
(D) Copper (II) oxide
ANS. (C) Zinc oxide

36. Q8. State one observation for
each of the following:
(i) Excess ammonium hydroxide
solution is added to lead nitrate
solution.
ANS. chalky white ppt dissolved
to form clear solution.

37. Q8. State one observation for
each of the following:
(ii) Sodium hydroxide solution is
added to ferric chloride solution
at first a little and then in excess.
ANS. Dirty green ppt is formed
which remains insoluble in
excess of sodium hydroxide.

39. ANS 1 c, 2 a 3. E, 4. B, 5 d

40. Q10. Hydroxide of this metal is
soluble in sodium hydroxide
solution.
(A)Magnesium
(B) Lead
(C)Silver
(D)Copper
ANS. Lead

41. Q11. Sodium hydroxide solution is added to the solution
containing the ions mentioned in List X. List Y gives the details of
the precipitate. Match the ions with their coloured precipitates.
(i) Pb2+ A. Reddish brown
(ii) Fe2+ B. White insoluble in excess
(iii) Zn2+ C. Dirty green
(iv) Fe3+ D. CHALKY white soluble
in excess
(v) Cu2+ E. White gel soluble in
excess
2+

42. (i) d, (ii) c (iii) e (iv) a (v) f (vi) b
(i) Pb2+ A. Reddish brown
(ii) Fe2+ B. White insoluble in excess
(iii) Zn2+ C. Dirty green
(iv) Fe3+ D. CHALKY white soluble in
excess
(v) Cu2+ E. White gel soluble in excess
(vi) Ca2+ F. Blue

43. Q12. Write balanced chemical
equations for the following:
(i) Zinc oxide dissolves in sodium
hydroxide
ZnO + 2NaOH  Na2ZnO2 + H2
Q13. What happens to the crystals of
washing soda when exposed to air?
Name the phenomenon exhibited.
It loses the water of crystallisation.
Efflorescent .

44. To prepare Iron (III) chloride in the
laboratory

45. (i) What is substance B?
ANS. anhydrated calcium chloride
(II) What is the purpose of B?
ANS. To prevent FeCl3 to absorb
moisture.

46. (iii) Why is iron (III) chloride to
be stored in a closed container?
FeCl3 being deliquescent substance
it can absorb moisture.
(iv) Write the equation for the
reaction between iron and
chlorine.
Ans 2Fe + 3Cl2  2FeCl3

47. Q15. i) Write the equation(s)
for the reaction(s) to prepare
lead sulphate from lead
carbonate.
PbCO3 + 2HNO3 
Pb(NO3)2 + H2O+CO2
Pb(NO3)2 + H2SO4 
PbSO4 + 2HNO3

48. Q16. The salt in which solution gives
a pale green precipitate with
sodium hydroxide solution and a
white precipitate with barium
chloride solution is:
(A) Iron(III) sulphate.
(B) Iron(II) sulphate.
(C) Iron(II) chloride.
(D) Iron(III) chloride.
ANS. (C) Iron(II) chloride.

49. Q17. Name the term
(i) A salt containing a metal ion
surrounded by other ions or
molecules.
ANS. COMPLEX ION
(ii) A base which is soluble in
water.
ANS. ALKALI

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