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12th Chemistry chapter 6 Bihar board with NCERT-Details & Highlights
| name of content | 12th Chemistry chapter 6 full solution |
| content | Chemistry objective type MCQ question with answer |
| name of subjects | class 12 Chemistry |
| important for exam | Bihar board & other state board |
| pattern & Level | NCERT & State level question |
12th Chemistry chapter 6 all objective solutions – download PDF
1. . The most abundant element in the earth’s crust is
-
- ( So
- ( B ) A1
- ( C ) O
- ( D ) Fe
Answer : ( B ) A1
2. XeF . has the shape of
-
- (A) tetrahedral
- (B) square planar
- (C) Pyramidal
- (D) Linear
Ans: (B) Square Planner
3. Which of the following does not form hydrogen bond?
-
- ( A ) NH3
- (B) H2O
- ( C ) HCI
- ( D ) HF
Answer: (C)HCI
4. The main source of helium is
-
- (A) wind
- ( B ) H , 0
- (C) Monozite
- (D) water
Answer 
C) Monozite
C) Monozite5. Which of the following metals is liquid at ordinary temperature?
-
- (A) Zinc
- (B) mercury
- (C) Bromine
- (D) water
Answer: (B) mercury
6. Which of the following is least Bhasmic
-
- (A) NCI;
- ( B ) NBIZ
- (C) NIZ
- (D) NFZ
Answer: (C) NIZ
7. Which of the following is called Green Thoth
-
- ( A ) FeSO4.7H20
- ( B ) CuSO4.5H20
- (C) CaSO4.2H20
- (D) none of these
Answer: (A)FeSO4.7H20
8. Elements of which group are called transition elements?
-
- (A) p-block
- ( B ) -BLOCK
- (C) d-block
- (D) f-block
Answer: (C) d-block
9. Sulphide ores are generally concentrated with …….
-
- (A) foam buoyancy method
- (B) Jaran –
- (C) Gravity
- (D) reduction by carbon
Answer: (A) Foam floatation method
10. Sodium is a member of which group in the periodic table?
-
- (A) Group-1
- (B) Group-II
- (C) Group-IV
- (D) none of these
Answer: (A) Group-1
Bihar Board 12th chemistry chapter 6 most mcq solution
11. The ore of aluminum is
-
- (A) Bauxite
- (B) Hematite
- (C) Domamite
- (D) none of these
Answer: (A) Bauxite
12. Malachite ore is
-
- (A) Iron
- (B) Copper
- (C) Mercury
- (D) Zinc
Answer: (B) Copper
13. slaked lime
-
- ( A ) CaO
- ( B ) CaCO3
- ( C ) Ca ( OH ) 2
- (D) none of these
Answer: (C)Ca (OH) 2
14. The outermost configuration is 3d°45
-
- (A) of Ca.
- (B) of Zn
- (C) of Mg
- (D) none of these
Answer: (D) none of these
15. The chemical name of borax is
-
- (A) sodium tetraborate
- (B), sodium metaborate
- (C) Sodium arthroborate
- (D) none of these
Answer: (A) Sodium Tetraborate
16 is a good conductor of heat and electricity
-
- (A) Anthracite
- (B) Coke
- (C) Graphite
- (D) Charcoal
Answer: (C) Graphite
17. Among the following allotropes the highest percentage of carbon is
-
- (A) wood charcoal
- (B) Coconut charcoal
- (C) Prephyte
- (D) none of these
Answer: (C) Prephyte
18. Cinevar is called
-
- ( A ) Hgs
- ( B ) Pbs
- ( C ) ZnS
- ( D ) HAS
Answer: (A)Hgs
19. Laundry soda is
-
- (A) Na, co, • 10H, O
- (B) Na, COF • 5HO
- (C) Narcos
- ( D ) NaOH
Answer : ( A )Na , co , • 10H , O
20. The formula of copper pyrite is
-
- (A) CuFeS
- ( B ) CuFeS2
- ( C ) Cus
- (D) With FeS2
Answer: (B)CuFeS2
BSEB 12th chemistry chapter 6 important mcq notes
21. Zinc is obtained from blending
-
- ( A ) Zno
- ( B ) ZnCO3
- ( C ) ZnSO4
- ( D ) Zn
Answer: (C)ZnSO4
22. By which method the zinc blend ore is concentrated?
-
- (A) Gravity Separation Method
- (B) Magnetic separation method
- (C) Fen lubrication method
- (D) none of these
Ans: (C) Fen lubrication method
23. Which of the following is not a member of the class of first transition elements?
-
- ( A ) Cr
- ( B ) Fe
- (C) Mg
- (D) Mn
Answer: (C) Mg
24. Which of the following is not an alkaline flux?
-
- ( A ) CaO •
- ( B ) Mgo
- (C) Si02
- (D) SiO , and P , 05
Answer: (D) SiO, and P, 05
25. Pyrolusite ore is
-
- (A) Sulfide
- (B) Oxide
- (C) Carbide
- (D) none of these
Answer: (B) Oxide
26. Bauxite is purified by
-
- (A) Hall method
- (B) Bayer method
- (C) Sarpek method
- (D) all of the above
Answer: (A) Hall method
27. In which method a catalyst is not used?
-
- (A) Contact method
- (B) Ostwald method
- (C) Haber method
- (D) Thermite method
Answer: (D) Thermite method
28. Millerite is the ore of?
-
- (A) Ni
- (B) With
- ( C ) Fe
- (D) AI
Answer: (A)Ni
29. Who degrades iron oxide in air furnace?
-
- ( A ) C
- (B) CO
- (C) Zn
- (D) Limestone (Caco)
Answer: (B)CO
30. Reductant in Cyanide process is
-
- (A) Zn
- (B) And
- (C) Ca.
- ( D ) Fe
Answer: (A)Zn
Important most mcq notes 12th chemistry chapter 6
31. 2M + 4CN + 2H , 0 + 02 + 2 [ M ( CN ) , ] + 4OF then metal M can be
-
- (A) Ag
- (B) To
- (C) With
- (D) Ag and Au
Answer: (D) Ag and Au
32. In the extraction of silver in the cyanide method, Zn forms a soluble complex compound
-
- (A) Na [Zn (CN)]
- ( B ) [ Cu ( CN ) , 12
- ( C ) ( Zn ( CN )
- (D) none of these
Answer A )Na [ Zn ( CN ) ]
A )Na [ Zn ( CN ) ]33. Zinc is used in which of the following?
-
- (A) in the industry of paint
- (B) Jewelery
- (C) in both (A) and (B)
- (D) none of these
Answer: (A) In the industry of paint
34. Radium is obtained from?
-
- (A) Zinc Blend
- (B) Monozite
- (C) Hematite
- (D) none of these
Answer: (A) Zinc Blend
35. What does not happen in the blast furnace in the extraction of iron?
-
- (A) Reduction
- (B) liquefaction
- (C) Jaran
- (D) sublimation
Answer: (D) Sublimation
36. Leaching method is used for the concentration of which ore?
-
- ( A )
- (B) To
- (C) With
- (D) Au और AI
Answer: (D) Au and AI
37. The process of removing sulfur by heating the ore is called
-
- (A) Filtration
- (B) Jaran
- (C) profuse
- (D) none
Answer: (B) Jaran
38. Which pair is wrong?
-
- (A) Zn-Calamine
- (B) Cu- Malachite
- (C) Pb-gypsum
- ( D ) Al – AFRIIST
Answer: (C) Pb-gypsum
39. In electrolyting purification impure metal is made?
-
- (A) Anode
- (B) cathode
- (C) electrolyte
- (D) anode and cathode
Answer: (A) Anode
40. Which of the following is not obtained by electrolysis?
-
- ( A ) Ca
- ( B ) Mg
- (C) AI
- ( D ) Cr
Answer: (D)Cr
41.d – The shape of the orbital is
-
- (A) spherical
- (B) Dumbbell
- (C) Double Dumbbell
- (D) none of these
Answer: (C) Double Dumbbell
42. The important ore of iron is
-
- (A) Siderite
- (B) Hematite
- (C) Pyrite
- (D) Bauxite
Answer: (B) Hematite
43. Which of the following is not included in the element of group 17?
-
- ( A ) Fe
- (B) C.I.
- ( C ) Br
- ( D ) I
Answer: (A) Fe
44. The slag produced in the extraction of iron is
-
- ( WHY
- ( B ) FeSioz
- ( C ) Mgsio ,
- (D) Casios
Answer: (D) Casios
45. The oxidation number of Ni (CO ) Nickel is
-
- ( A ) 1
- ( B ) 3
- ( C ) 0
- ( D ) 2
Answer : ( C ) 0
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| SL.N. | Subject name with solutions |
| 01 | Physics |
| 02 | Chemistry |
| 03 | Biology |
| 04 | Math |
| 05 | Hindi |
| 06 | English |
