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12th Chemistry chapter 7 Bihar board with NCERT-Details & Highlights
| name of content | 12th Chemistry chapter 7 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 7 all objective solutions – download PDF
1. Which of the following is not an element of p-section?
-
- ( A ) Sn
- ( B ) P
- ( C ) S
- (D) Ba
Answer: (D)S
2. Which of the following is not a p-block element?
-
- ( A ) HF
- (B) AI
- (C) Mg
- ( D ) Pb
Answer: (C)Mg
3. Which of the following is the strongest acid?
-
- ( A ) HF
- ( B ) MCI
- ( C ) HBr
- ( D ) HI
Answer: (D)HI
4. Which of the following is not correct in the white phosphorus (P) molecule
-
- (A) 6P – P is a single bond.
- (B) 4P – P is a single bond.
- (C) 4 lone pair electrons.
- (D) The bond angle is 60°.
Answer: (B) 4P – P is a single bond.
5. The nitrate of which of these metals on thermal dissolution liberates a colorless gas?
-
- ( A ) NaNO ,
- (B) Cu (NO3) 2
- ( C ) Ba ( NO3 ) 2
- ( D ) Hg ( NO3 ) 2
Answer : ( C ) Ba ( NO3 ) 2
6. What is the configuration of the outer shell of the phosphorus atom?
-
- ( A ) ns 2np
- ( B ) ns2np
- ( C ) na2 np3
- ( D ) nsnp
Answer C) na2 np3
7. Which of the following oxides is coloured?
-
- ( A ) NO
- ( B ) NO
- ( C ) NO2
- ( D ) NO
Answer: (C)NO2
8. What is formed when phosphorus is treated with caustic soda solution?
-
- (A) PH , and NaH , POS
- (B) PH , and NaH , PO ,
- (C) Na, PO, and NaH, POS
- (D) Na HPO, और Na, HPos
Answer: (B)PH, and NaH, PO,
9. The gas which cannot be collected on water
-
- (A) N2
- (B) O2
- (C) SO3
- ( D ) PH3
Answer: (C) SO3
10. Which of the following is a metalloid?
-
- ( A ) S
- ( B ) Sb
- ( C ) P
- (D) Bi
Answer: (B) Sb
Bihar Board 12th chemistry most mcq solution
11. Which of the following is the correct order of the first ionization potentials?
-
- ( A ) C < N < O < F
- ( B ) C > N > O > F
- ( C ) C < N > O < F
- ( D ) C > N < O < F
उत्तर : ( C )C < N > O < F
12. nitrous oxide is
-
- (A) acidic
- (B) sadness
- (C) Indifferent
- (D) amphoteric
Answer: (C) Indifferent
13. What is the basicity of H , PO 2 ?
-
- ( A ) 1
- ( B ) 2
- ( C ) 3
- ( D ) 0
Answer : ( B )2
14. The order of decreasing dissociation energy of halogen molecules x2 is
-
- ( A ) F2 , Cl2 , B12,12
- ( B ) 12 , Brz , Cl2 , F2
- ( C ) Cl , Br2 , F2 , 12
- ( D ) Br , C1 , F2,12
Answer : ( C )Cl , Br2 , F2 , 12
15. What is the order of decreasing electronegativity of halogens?
-
- ( A ) F , CI , Br , 1
- ( B ) I , Br , CI , F
- ( C ) CI , F , Br , 1
- ( D ) Br , Cl , F , 1
Answer : ( A )F , CI , Br , 1
16. What is the correct order of electron affinity of the halogens?
-
- ( A ) F > CI > Br > 1
- ( B ) F < Cl < Br < I
- ( C ) F < Cl > Br > I
- (D) F> CI
उत्तर : ( C )F < Cl > Br > I
17. What is the order of decreasing oxidising power of halogens?
-
- ( A ) F2 , Cl , Bry , 12
- ( B ) Cl2 , Brz , 12 , F2
- ( C ) F2 , Brz , Cl2 , 12
- ( D ) CI2 , F2 , I2 , BE
Answer: (A) F2 , Cl , Bry , 12
18. What is the order of increasing acid strength of halogen acids HX?
-
- ( A ) HF , HCI , HBr , HI
- ( B ) HCI , HF , HBr , HI
- ( C ) HI , HBr , HCI , HF
- ( D ) HE , HCI , HI , HBr
Answer: (A)HF, HCI, HBr, HI
19. Which of the following acid attacks glass?
-
- (A) HI
- ( B ) HF
- ( C ) HCI
- ( D ) HBr
Answer: (B)HF
20. Which of the halides of calcium is insoluble in water?
-
- (A) CaF2
- ( B ) CaCl2
- ( C ) CaBrz
- ( D ) Cal2
Answer: (A)CaF2
21. Which of the halides of silver is soluble in water?
-
- (A) AgF
- (B) AgCI
- ( C ) AgBr
- (D) Agi
Answer: (A) AgF
BSEB 12th chemistry chapter 7 most objective solution
22. The major source of helium is
-
- (A) wind
- (B) Monazite
- (C) sand
- (D) all of the above
Answer: (B) Monazite
23. What are the main components of kale?
-
- ( A ) NaCl + NaCIO3
- ( B ) KBr + KBro .
- ( C ) Nal + Nalog
- ( D ) NaNO3 + Nalos
Answer: (D) NaNO3 + Nalos
24. Which of the following is formed when iodine is reacted with sodium hypo solution?
-
- ( A ) Na2SOT
- ( B ) Na2SO4
- (C) Nas, 06
- (D) NanSO4
Answer : ( C ) Nas , 06
25. The gas used in bright electrical advertisements is
-
- (A) genon
- (B) Organ
- (C) neon
- (D) Helium
Answer: (C) Neon
26. What is the percentage by volume of inert gases in air?
-
- ( A ) 20 %
- ( B ) 10 %
- ( C ) 1 %
- ( D ) 0.1 %
Answer: (C)1 %
27. What is formed when nitrogen gas is passed over a blood-heated magnesium metal?
-
- ( A ) Mg ( NO3 ) 2
- ( B ) MgN
- (C) MgN2
- ( D ) Mg3N2
Answer: (D) Mg3N2
28. The discoverer of the organ is
-
- (A) Raleigh
- (B) Mercury
- (C) Frankland and Lockyer
- (D) Both ‘ A ‘ and ‘ B
Answer: (A) Raleigh
29. A – atomic gas is
-
- (A) Hydrogen
- (B) Helium
- (C) Nitrogen
- (D) Fluorine
Answer: (B) Helium
30. Which of the following is used in the manufacture of signal lamps at airports?
-
- (A) Sodium
- (B) Helium
- (C) neon
- (D) Halogen
Answer: (C) Neon
31. Noble gases are chemically inert because they
-
- (A) are monoatomic
- (B) having low boiling point
- (C) have high ionization potential
- (D) receipt is rare
Answer: (C) have high ionization potential
32. Helium is filled in tires in aircraft due to
-
- (A) It is the lightest inert gas
- (B) It is much lighter and inflammable gas than air
- (C) it provides very little heat
- (D) none of these
Answer: (B) It is very light and inflammable gas than air
Important most mcq solution 12th chemistry chapter 7
33. Nitrogen molecule is diatomic. Which of the following is a white phosphorus molecule?
-
- ( A ) P2
- ( B ) P
- ( C ) P
- (D) Pg
Answer: (B)P
34. Which of the following elements has the highest electronegativity?
-
- ( A ) P
- ( B ) C
- ( C ) As
- ( D ) N
Answer: (D)N
35. In which liquid white phosphorus is kept?
-
- (A) Water
- (B) kerosene oil
- (C) ethyl alcohol
- (D) Chloroform
Answer: (A) Water
36. The oxide of which of the following elements reacts with both acids and bases?
-
- ( A ) P
- ( B ) S
- (C) Sb
- (D) Yes
Answer: (C)Sb
37. Copper-ammonia hybrid salt of dark blue color is formed when excess ammonium hydroxide solution is added to copper sulphate solution. What is its formula?
-
- (A) [Cu (NH3)] SO
- ( B ) [ Cu ( NH3 ) 2 ] SO
- (C) [Cu (NH 3) 4] SO
- (D) [Cu (NHSTA] SO
Answer : ( C ) [ Cu ( NH 3 ) 4 ] SO
38. Which one of the following hydroxides does not dissolve in excess of ammonium hydroxide solution in the presence of ammonium chloride?
-
- ( A ) Ca ( OH ) 2
- ( B ) Zn ( OH ) 2
- (C) Cu (OH) 2
- ( D ) Fe ( OH ) 3
Answer : ( D )Fe ( OH ) 3
39. Which compound is present in Nasler’s reagent?
-
- (A) (Ag (NH3) 2] CI
- ( B ) K2 [ Hgle ]
- ( C ) K , [ Fe ( CN ) ]
- (D) [Cu (NH3)] SO
Answer : ( B ) K2 [ Hgle ]
40. What is formed by the thermal decomposition of ammonium nitrate?
-
- ( A ) NH , NO2
- (B) O2
- (C) N2
- ( D ) NO
Answer: (A)NH, NO2
41. What is the catalyst in the Ostwalt method for the manufacture of nitric acid?
-
- (A) Platinum
- (B) Vanadium pentoxide
- (C) Iron
- (D) nickel
Answer: (C) Iron
42. What is formed when tin reacts with hot concentrated nitric acid?
-
- ( A ) Sn ( NO3) 2
- ( B ) NH4NO3
- ( C ) H_SnO3
- ( D ) NO
Answer: (C) H_SnO3
43. What is formed when iodine reacts with hot concentrated nitric acid?
-
- (A) HIO2
- ( B ) INOS
- ( C ) HIO
- ( D ) HIO3
Answer: (D)HIO3
44. Nitrogen is produced on heating?
-
- ( A ) HNOS
- ( B ) NH4Cl + NaNO2
- ( C ) NH , NO3
- ( D ) NHCl
Answer: (B) NH4Cl + NaNO2
45. What type of hybridization is there on the atom in the So2 molecule?
-
- ( A ) sp
- ( B ) spi
- ( C ) sps
- ( D ) spid
Answer: (B)spi
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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 |
