CBSE Class 12 Chemistry All Chapters Revision Questions

 By showing the flash cards.

NaCl

Common salt ki Dandi march ---- From the angle of chemistry

THE SOLID STATE :

1. NaCl is a -------------------(amorphous , crystalline) substance

2.NaCl belongs to ----------- crystal system? ( cubic , hexagonal , triclinic ,orthorhombic )

3. NaCl shows a property of ---------------- ( isotropic , anisotropic)

4.Which one conducts both in molten and aqueous state but not conduct in solid state ( Na , NaCl)

5.NaCl is is which type of crystal? ( covalent , metallic , ionic , molecular)

6.NaCl belongs to --------------- type crystal? ( primitive , bcc , fcc)

7.What is the Co-ordination number of NaCl?

8.NaCl belongs to --------------------- type of packing? (ABABAB… ,ABCABCABC…..)

9.In NaCl crystal, which one present in octahedral voids? (Na⁺ , Cl^-)

10.NaCl crystal act as ------ (insulator, semiconductor, conductor) at room temperature

11.How many number of chloride ions present in a cubic unit cell of Na Cl?

12.When NaCl is heated conductivity ---------------------- ( increases , decreases)

13.F-Centre is ---------------------- type of defect ( stoichiometric , nonstoichiometric

14.NaCl shows ---------------------- defect ( Frenkel , Shottky )

15.NaCl is ----------------- (diamagnetic, paramagnetic) substance.

16.What happens when NaCl crystals are heated in an atmosphere of sodium vapours?

17.When N_aCl added in SrCl₂ , what type of defect is observed ?( Shottky defect ,frenkel defect , impurity)

18.F-centre shown by NaCl crystal is ----------------- in colour? ( pink , yellow ,violet)

19.If N_aCl is doped with 10-3 mol% of S_rCl₂ ,The concentrations of cation vacancies are ----

20.Refractive index of which solid is /are observed to have the same value along all directions? ( NaCl ,Quartz , Glass , PVC)

21. What percent of octahedral voids are occupied in NaCl crystal? (25%, 50%, 100%)

22. When NaCl crystal is heated what happens to its Co-ordination number? (Increases, decreases)

CHAP-2 : SOLUTIONS

23. What inter-particle interaction is present when NaCl is dissolved in water?

24. Vapour pressure is ---------------(increased , decreased) when NaCl is added in water .

25.Which has more Freezing point and why? ( Distilled water or Sea water )

26. What is the van’t Hoff factor of NaCl in very dilute solution in Water?

27.Whose boiling point is more and why? ( 1mol of NaCl in 100 mL water , 1 mol of Glucose in 100mL water)

28. Which has more osmotic pressure and why? (1M NaCl solution , 1M Glucose solution)

29. Name the process used to get fresh water from salt water.

30.Why NaCl act as de-icing agent?

31.How NaCl helps to preserve meat?

32.1% NaCl solution is called ------- (hypertonic, hypotonic, isotonic) solution to the plasma concentration of human blood cell?

33.When you measure molar mass through colligative properties,why NaCl shows abnormal molecular mass but nor glucose ?

34.When a person takes lot of salt or salty food, he/she experience water retention in tissue cells and intercellular spaces because of ----------------- . The resulting puffiness or swelling is called -------------------------.

35.When 5.85g of NaCl is added in 100 mL water , then the Formality(or Molarity)of the aq. Solution is -------- M

36.When heated solubility of NaCl in water -------------------------- ( decreases ,increases)

37. Aqueous NaCl solution is ------------------- solution ( ideal , non-ideal)

38.Aqueous NaCl solution is shows ---------------- (positive, negative, no ) deviations from Raoult’s Law

39. Kya apke tooth paste me NAMAK HAI”? Why NaCl is added in tooth paste?

40. Whose “i” (van’t Hoff factor) is more and why? (0.1m , 0.01m)

41. Why doctors asked the patient to take low sodium salt for high B.P patient?

42. Why do you gargle luke warm salt water?

CHAP-3 : ELECTROCHEMISTRY

43. NaCl is -------------------- (strong , weak) electrolyte

44. Which one is used in salt bridge more frequently? (NaCl, KCl)

45. Corrosion becomes --------------- (faster. slower) in saline condition.

46. When dilution occurs in Aq. NaCl solution , conductivity ------(decreases , increases)

47. Write the Kohlrausch limiting molar conductivity equation for NaCl?

48. Molar conductivity of aq. NaCl -----(increases , decreases) with dilution linearly with √C

49. What happens when aqueous NaCl is electrolysed at platinum electrode?

50. What happens when molten NaCl is electrolysed at platinum electrode?

51. Say True or False. Limiting molar conductivity cannot be obtained for aq. NaCl graphically.

52. Which one show more limiting conductivity in water at 298 K? ( Na⁺ , K⁺ )

53. How much Chlorine gas in terms of gram would be produced when 96500 C is passed in aq NaCl solution?

CHAP-5 : SURFACE CHEMISTRY

54. NaCl in water is a ------------------------- ( crystalloid , colloid)

55. Say TRUE or FALSE. – Aq solution of NaCl will show Tyndal Effect.

56. What happens when NaCl is added in positively charged sol ferric hydroxide?

57. Which has better coagulation capacity for potitively charged ferric hydrohyde sol?(NaCl, Potassium Ferrocyanide)

58. Name the enzyme that shows high catalytic activity in presence of NaCl which provides Na⁺.

59. What is the charge of sol developed when NaCl is added in excess of AgNO₃ solution?

Chap-7 : p-BLOCK ELEMENTS

60. Name the gas obtained when NaCl is treated with Conc . H₂SO₄.

61. Name the gas produced when NaCl is reacted with MnO₂ and Conc. H₂SO₄?

62. What do you observe when Aq.NaCl is treated with acidified KMnO₄ solution?

63. Which is more covalent in nature? (LiCl, NaCl )

Miscellaneous

64. Why NaCl is added in soap preparation?

65. Why a small amount of NaCl is added during the preparation of egg albumin sol.

UNIT-1: TOPIC: SOLID STATE

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