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12th Chemistry chapter 8 Bihar board with NCERT-Details & Highlights
| name of content | 12th Chemistry chapter 8 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 8 all objective solutions – download PDF
1. Who made the modern periodic table?
-
- (A) Debonair
- (B) mandliff
- (C) Mandel
- (D) none of these
Answer: (D) none of these
2. transition element is
-
- (A) Metal
- (B) non-metal
- (C) Elements of the d-section
- (D) gas
Answer: (C) Elements of d-section
3. The main characteristic of transition metals is that
-
- (A) They show variable oxidation states
- (B) They show inert pair effect
- (C) They do not form complex ions
- (D) All of them show diamagnetic properties
Answer: (A) They show variable oxidation states
4. Who has the maximum number of unpaired electrons?
-
- (A) Zn *
- ( B ) Fe2 +
- (C) Night
- ( D ) Cut
Answer : ( B ) Fe2 +
5. If KMnO4 is reduced by oxalic acid in acidic medium, then the oxidation of Mn changes to
-
- (A) +4 to +2
- ( B ) +6 to +4
- ( C ) +7 to +2
- ( D ) +7 to +4
Answer : ( C )+7 to +2
6. AgCl is soluble in NH, OH. The reason for solubility are construction
-
- ( A ) AgOH
- ( B ) Ag20
- ( C ) [ Ag ( NH3 ) 21 *
- ( D ) NH4Cl
Answer : ( C ) [ Ag ( NH 3 ) 21 *
7. Which of the following shows maximum oxidation state?
-
- ( A ) Sc
- ( B ) Fe
- (C) Zn
- (D) Mn
Answer: (D) Mn
8. Of the following pairs of ions, the lower oxidation state in an aqueous solution is more stable than the other.
-
- (A) You ”, T: 3+
- (B) With Cu2 +
- ( C ) Cr2 + , Cr3 +
- ( D ) V2 + , VO2 +
Answer : ( A ) Ti ” , T : 3+
9. In which of the following pairs, both the ions are colored in aqueous solution.
-
- ( A ) Ni2 + , Cut
- ( B ) Ni2 + , T13 +
- ( C ) Sc3 + , Ti3 +
- ( D ) Sc3 + , Co2 +
Answer : ( B )Ni2 + , T13 +
Bihar Board most mcq solution 12th chemistry chapter 8
10. The position of the transition elements in the periodic table is
-
- (A) 5 – in the block
- (B) in p-block
- (C) in d-block
- (D) none of these
Answer: (C) in d-block
11. The transition element in the following pairs is
-
- (A) Na and Ca
- (B) Mg and AI
- (C) S and P
- (D) Cu and Fe
Answer: (D)Cu and Fe
12. Chromium salts are colored because it is a
-
- (A) common element
- (B) is a typical element
- (C) is the transition element
- (D) lanthanide element
Answer: (C) transition element is
13. Which of the following is a common property of all transition elements?
-
- (A) These are metals.
- (B) All of them show different oxidation states.
- (C) All of them are paramagnetic.
- (D) All these form complex compounds.
Answer: (A) These are metals.
14. Which of the following transition metals shows maximum oxidation state?
-
- ( A ) Fe
- (B) Mn
- ( C ) V
- ( D ) Cr
Answer: (B) Mn
15. Transition metals are usually paramagnetic
-
- (A) Due to high melting point and boiling point
- (B) due to the presence of vacant orbitals
- (C) due to presence of unpaired electron
- (D) due to malleability and ductility
Answer: (C) Due to presence of unpaired electron
16. Which of the following compounds will be colored?
-
- (A) Ag2SO4
- ( B ) CuF2
- ( C ) MgF2
- (D) Cuci
Answer: (B)CuF2
17. Dichromate ion ( Cr , 0 ) – in
-
- (A) 4Cr – 0 bonds are equivalent
- (B) 6Cr – 0 bonds are equivalent
- (C) All Cr – 0 bonds are equal
- (D) Not all Cr – 0 bonds are equal
Answer: (B) 6Cr – 0 bonds are equivalent
18. The reason for the explosion by adding concentrated H, SO2 to KMnO2 is
-
- ( A ) MnO ,
- ( B ) MnO2
- ( C ) MnSO
- (D) Mn 03
Answer: (A) MnO
19. Brown Catalyst
-
- (A) AgNO solution
- (B) NaOH + NH4OH
- (C) Nickel bromide
- (D) all of the above
Answer: (C) Nickel bromide
BSEB 12th chemistry chapter 8 objective solution
20. An essential component of photographic film and plate is
-
- (A) Silver nitrate
- (B) Silver Bromite
- (C) Sodium chloride
- (D) oleic acid
Ans: (B) Silver bromite
21. The permanent oxidation number of Ce (Z = 58) is
-
- ( A ) +3
- ( B ) + 4
- ( C ) +5
- ( D ) +6
Answer : ( A )+3
22. The maximum oxidation number displayed by manganese is
-
- ( A ) +7
- ( B ) +5
- ( C ) +6
- ( D ) +8
Answer : ( A ) +7
23. The oxidation number of Fe in the brown color [Fe(H,0)-NO]SO2 is
-
- ( A ) 1
- ( B ) O
- ( C ) 2
- ( D ) 3
Answer : ( C )2
24. On heating Feso, it is obtained
-
- (A) SO2
- ( B ) SOZ
- (C) SO2, SO3
- (D) SO2 and 02
Answer: (C) SO2, SO3
25. I is liberated by adding x to a solution of KI, then x is
-
- ( A ) ZnCl2
- ( B ) HgCl2
- (C) HERE
- ( D ) FeCl ,
Answer: (B) HgCl2
26. Which of the following shows maximum oxidation state?
-
- ( A ) SC
- ( B ) Fe
- (C) Zn
- (D) Mn
Answer: (D) Mn
27. Among the following pairs of ions, the lower oxidation state in aqueous solution is more stable than the other
-
- ( A ) Tit , Ti3 +
- ( B ) Cut.cu2 +
- ( C ) Cr2 + , Cr3 +
- ( D ) v2 + .vor +
Answer: (A) Tit, Ti3 +
28. In aqueous solution of the following pair, both the ions are colored
-
- ( A ) Ni2 + , Cut
- ( B ) Ni2 + . T ; 3+
- ( C ) SC3 + , T13 +
- ( D ) CO2 +
Answer: (B)Ni2 + . T ; 3+
29. Cuso, + KI + x (white precipitate) is
-
- (A) Cul2
- ( B ) Cul
- ( C ) KCulh
- (D) Ass2
Answer: (A)Cul2
12th chemistry chapter 8 most important notes and solution
30. Bilister is copper
-
- (A) Pure copper
- (B) Copper ore
- (C) Alloy of Copper
- (D) Copper + impurity
Answer: (D) Copper + impurity
31. In K, Cr, 0, how many oxygen atoms are attached to each chromium?
-
- ( A ) 4
- ( B ) 2
- ( C ) 6
- ( D ) 3
Answer : ( A )4
32. The compound x of mercury, which is used in cosmetic, ayurvedic and unani medicine, is
-
- ( A ) Hgs
- ( B ) Hg , C12
- ( C ) HgI2
- ( D ) HgCl2
Answer: (A) Hgs
33. In which metal is insulin, hemoglobin and vitamin B12?
-
- ( A ) Zn , Hg , Cr
- (B) Co, Fe, Zn
- (C) Mg, Fe, CO
- (D) Zn, Fe, CO
Answer: (D) Zn, Fe, CO
34. The equivalent mass of KMnO2 in a strong alkaline medium is
-
- ( A ) 31.6
- ( B ) 158
- ( C ) 52.67
- ( D ) 79
Answer : ( B )158
35. Which of the following is not oxidised by ozone
-
- (A) KI
- ( B ) FeSO4
- (C) KMnOA
- (D) KMnOS
Answer: (C)KMnOA
36. The byproduct and its color on heating MnO2 with KOH is
-
- (A) K , MnO green
- (B) KMnOS, Purple
- (C) Mnos , Brown
- ( D ) MnO4 , FPTOIT
Answer: (A)K, MnO Green
37. The oxidation number of Cr in the byproduct of KI and acidic potassium dichromate is
-
- ( A ) +4
- ( B ) + 2
- ( C ) +6
- ( D ) +3
Answer: (D)+3
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Bihar board 12th science stream subjects wise solution
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| SL.N. | Subject name with solutions |
| 01 | Physics |
| 02 | Chemistry |
| 03 | Biology |
| 04 | Math |
| 05 | Hindi |
| 06 | English |
