Bihar Board 12th Chemistry Important Questions Short Answer Type Part 1 in English

BSEB Bihar Board 12th Chemistry Important Questions Short Answer Type Part 1 are the best resource for students which helps in revision.

Bihar Board 12th Chemistry Important Questions Short Answer Type Part 1 in English

Question 1.
Write chief ore of Zinc.
Answer:
Following chief ores of Zinc ore-
(a) Calamine – ZnCO₃
(b) Zinc Blende – ZnS.
(c) Zincite – ZnO
(d) Frantelinite – ZnO·Fe₂O₃

Question 2.
What is Gangue.
Answer:
The Impurities present in the Phase of ores of metal known as Gangue.
Example. Silica (SiO₂) CeO, CaO etc.

Question 3.
What is Hybridisation of Carbon in CH₄.
Answer:
Sp³.

Question 4.
What is the formula of oleum.
Answer:
H₂S₂O₇

Question 5.
What is Nitroleum.
Answer:
Mixture of carbon-and Calcium cyanamide known as Nitorleum i.e. CaNCN + C

Question 6.
What is the oxidation Number of Phosphorous in H₃PO₃.
Answer:
+3

Question 7.
What is Geometrical shape of sp³.
Answer:
Tetrahedral.

Question 8.
What is Geometrical shape of d²sp³.
Answer:
Octahedral.

Question 9.
Give examples of Amorphous Solid.
Answer:
Glass, Rubber, Plastics, Protein, Starch.

Question 10.
What is Geometrical shape of NH₃.
Answer:
Pyramidal.

Question 11.
What is structure of Ozone molecule.
Answer:
Triangular

Question 12.
What is formula of Caro’s acid.
Answer:
H₂SO₅

Question 13.
What is formula of Mashall acid.
Answer:
H₂S₂O₈

Question 14.
What is coordination Number of each ions in Rocksalt costal.
Answer:
6

Question 15.
Which Point defect charges density of solid in crystal unit cell.
Answer:
Schottky defees.

Question 16.
The solid in which Both Frenkel and schottky defect founds.
Answer:
AgBr.

Question 17.
What is Packing efficiency in follow in unit cell.
(a) Simple cubic unit cell
(b) Body-centred cubic unit cell
(c) Hexagonal close Packed Lattices
Answer:
The Packing efficiency of different unit cell are Giyen below-
(a) Simple cubic = 52.4%
(b) Body centred cubic = 68%
(c) Hexogonal close Packed = 74%

Question 18.
What types of stoichiometric defect are shown by ZnS.
Answer:
ZnS crystal shows Frenkel defects. In ZnS. Size of Cation is smaller as compared to the size of Anion.

Question 19.
Give examples of Anyjrphours solids.
Answer:
Glass, Rubber, Plastics, Strach, Protein etc.

Question 20.
Give examples of n-type extrinsic semiconductors.
Answer:
(a) Silicon containing P or As as Impurites.
(b) Germanium Containing P or As as the Impurities.

Question 21.
Give examples of P-types extrinsic semiconductors.
Answer:
(a) Silicon (Si) Containing B, or AI as Impurity.
(b) Germanium (Ge) Containing B or Al as Impurity.

Question 22.
How many atoms are present in Body centred cubic unit.
Answer:
2.

Question 23.
How many atoms are present in Face centred cubic unit cell.
Answer:
4.

Question 24.
What is radius ratio.
Answer:
The ratio of the radius of cation and radius of anion is called radius ratio.
Radius ratio = \(\frac{\text { Radius of cotton(r } \left.^{+}\right)}{\text {Radius of Anion }\left(r^{-}\right)}\)

Question 25.
What is Dry ice.
Answer:
Solid CO₂ is called as Dry ice.

Question 26.
What is Coordination Number of Body centered cubic unit cell.
Answer:
8.

Question 27.
What is coordination Number of h.c.p or c.c.p crystal.
Answer:
12.

Question 28.
What is the effect of Temperature on conductivity of semiconductor.
Answer:
Conductivity of Semiconductor is increases with rise in Temperature.

Question 29.
Give example of Antiferromagnetic.
Answer:
Cr₂O₃, Fe₂O₃, MnO, NiO·MnO₂ etc.

Question 30.
How many edges are present in a cube.
Answer:
6.

Question 31.
What is molarity and molality of Pure water at 21°C.
Answer:
Both Molarity and molality of Pure water at 25°C is same which equal to 55.5.

Question 32.
What is vant Hoff factor.
Answer:
Vant Hoff factors is denoted by ‘i’ Ratio of observed colligative Property and Normal colligative property of the solution is known as Vant Hoff factor.
Vant Hoff Factor (i) = \(\frac{\text { Observed colligative Property }}{\text { Normal colligative Property. }}\)

Question 33.
What is azeotropic Mixture.
Answer:
The Mixture which boils at constant temperature with change their composition known as Azeotropic Mixutre or Azeotrops.

Question 34.
What is Ideal solution.
Answer:
The solution which follows Raoult’s Law at all temp and concentration.
i.e. (i) P_A = X_A · P_A⁰, P_B = X_B · P_B⁰
(ii) ΔH_Mixing = 0
(iii) ΔV_Mixing = 0

Question 35.
What is Non-Ideal solution.
Answer:
A Solution Which is not follow to Raoult’s Law, Known as Non-Ideal solution.
(i) P_A ≠ X_A · P_A⁰, P_B ≠ X_B · P_B⁰
(ii) ΔH_Mixing ≠ 0
(iii) ΔV_Mixing ≠ 0

Question 36.
What is Isotonic solutions.
Answer:
Those solution which have same osmotic Pressure, is called isotonic solution.

Question 37.
Write Name of d-BIock elements.
Answer:
Transition Metal.

Question 38.
Write Name of f-Block Elements.
Answer:
Inner Transition Metal.

Question 39.
Write Formula of Green Vitriol.
Answer:
FeSO₄·7H₂O.

Question 40.
Write Name of metals present in Brass.
Answer:
Zn and Cu.

Question 41.
Write Name of Meta! Present in Vitamine B-12.
Answer:
Cobalt.

Question 42.
A 5 % solution of Cane-Sugar (molecular Mass = 342) is Isotonic with 1% solution of Substance X. The Molecule weight of X is-
Answer:
68.4

Question 43.
Write IUPAC Name of following.
Answer:
(a) [CO(NH₃)₄] Cl₂ = Tetra ammine cobalt (H) chloride .
(b) K₄ [Fe(CN)₆] = Potassium hexa Gyano Ferrate (II)
(c) K₂ [Ni(CN)₄] = Potassium tetra cyano Nickelate (II)
(d) [COCl₂ (NH₃)₄]Cl = Teta ammine dichloro cobalt (III) chloride
(e) [PtCl₄]^-2 = Tera chloro Platinate (II)

Question 44.
Write the Structure formula of the following-
(a) 4, 4 – Dimethyl – 2 – Pentanol (b) 2 – Butanol
Answer:

Question 45.
Write the structure of
2-Chloro-3-Methyl Pentane.
Answer:

Question 46.
Write the structure of
1-Bromo, -4-Sec-Butyl- 2- Methyl Benzene.
Answer:

Question 47.
Write IUPAC Name of the Compound
Answer:

Question 48.
How does a catalyst effect the rate of a reaction.
Answer:
A catalyst may Increases or decrease the rate of reaction.

Question 49.
Define the term Tyndall Effect.
Answer:
It is defined as the scattering of light by the colloidal particles present in a colloidal solution.

Question 50.
What is CMC (Critical Micelle Concentration).
Answer:
The formation of micelles take place only above certain concentration is called critical micelle concentration (C.M.C.)

Question 51.
What is Kraft Temperature.
Answer:
The formation of micelles take place only above a certain Temperature, called Kraft Temperature.

Question 52.
What is Slag.
Answer:
A mixture of flux and gangue is called slag.
Gangue + Flux → Slag.

Question 53.
Arrange the following sets of compounds in order of their Increasing Boiling point.
Pentan -1-01, Butan-1-01, Butan-2-01, Ethanol, Propan-1-01, Methanol.
Answer:
Methanol < Ethanol < Propan-1-01 < Butan-1-01 < Pentan-1-01.

Question 54.
(a) Complete the following reaction-

Answer:

Question 54.
(b) Complete the following reaction-

Answer:

Question 55.
What are Lanthanides.
Answer:
First Inner Transition series (4f-series) called Lanthanides.

Question 56.
Give the main reaction in Alumino thermic process.
Answer:
Cr₂O₃ + 2Al → 2Cr + Al₂O₃

Question 57.
What are Actinides.
Answer:
Second Inner Transition series (5f-series) Called Actinides.

Question 58.
(a) Arrange the following in increasing order of their and strength-Propan-1-01, 2, 4, 6 Prinitro-Phenol, 3-nitro phenol, 3,5- dinitrophenol, Pheno, 4-methyl Phenol.
Answer:
Propan-1-01 < 4-Methyl Phenol < Phenol < 2,4,6-trinitro phenol. < 3,5,= dinitro pheno, < 3-nitro phenol.

Question 58.
(b) Arragne in the Increasing order of Aud strength.
CCl₃COOH, CH₃COOH, CHCl₂COOH, CH₂Cl COOH.
Answer:
CH₃COOH < CH₂Cl COOH < CHCl₂ COOH <CCl₃COOH.

Question 59.
(a) Name the product.

Answer:

Question 59.
(b) Complete the reaction-

Answer:
RCH₂NH₂

Question 60.
(a) What is the product in the reaction.

Answer:
RCH₂ NH₂ + H₂O

Question 60.
(b) Complete the reaction-

Answer:
RCOOR’+ H₂O