Sample Paper Class 12 Chemistry Term 1 Set C
Please refer to Sample Paper Class 12 Chemistry Term 1 Set C with solutions provided below. We have provided CBSE Sample Papers for Class 12 Chemistry as per the latest paper pattern and examination guidelines for Standard 12 Chemistry issued by CBSE for the current academic year. The below provided Sample Guess paper will help you to practice and understand what type of questions can be expected in the Class 12 Chemistry exam.
CBSE Sample Paper Class 12 Chemistry for Term 1 Set C
Q. 1. Relative lowering of vapour pressure is a colligative property because _________ .
(A) It depends on number of particles of electrolyte solute in solution and does not depend on the nature of the solute particles.
(B) It depends on the concentration of a non electrolyte solute in solution as well as on the nature of the solute molecules.
(C) Is depends on the concentration of an electrolyte or non-electrolyte solute is solution as well on the nature of solute molecules.
(D) None of the above
Q. 2. What type of stoichiometric defect is shown by ZnS?
(A) Schottky defect
(B) Frenkel defect
(C) Both Frenkel and Schottky defects
(D) Non-stoichiometric defect
Q. 3. A compound of molecular formula C7H16 shows optical isomerism, compound will be :
(A) 2, 3-dimethylpentane
(B) 2, 2-dimethylbutane
(D) None of these
Q. 4. What is the effect of Frenkel defect on the density of ionic solids?
(A) The density of the crystal increases
(B) The density of the crystal decreases
(C) The density of the crystal remains unchanged
(D) There is no relationship between density of a crystal and defect present in it
Q. 5. A solution of acetone in ethanol :
(A) shows a negative deviation from Raoult’s law
(B) shows a positive deviation from Raoult’s law
(C) behaves like a near ideal solution
(D) obeys Raoult’s law
Q. 6. In the reaction
Q. 7. Chlorobenzene reacts with Mg in dry ether to give a compound (A) which further reacts with ethanol to yield :
(C) ethyl benzene
(D) phenyl ether.
Q. 8. Which one of the following elements is unable to form MF63– ion?
Q. 9. Which one is the complementary base of cytosine in one strand to that in other strand of DNA?
Q.10 Which of the following conditions favors the existence of a substance in the solid state?
(A) High temperature
(B) Low temperature
(C) High thermal energy
(D) Weak cohesive forces .
Q. 11. HBr reacts fastest with :
Q. 12. Which of the following is an amorphous solid?
(A) Graphite (C)
(B) Quartz glass (SiO2)
(C) Chrome alum
(D) Silicon carbide (SiC)
(A) a-Amino acid.
(B) Basic amino acid.
(C) Amino acid synthesised in body.
(D) b-Amino acid.
Q. 14. Consider the reaction, CH3CH2CH2Br + NaCN → CH3CH2CH2CN + NaBr This reaction will be the fastest in :
(C) N, N’-dimethylformamide (DMF)
Q. 15. Which one is most reactive towards SN1 reaction?
Q. 16. Which of the following compounds can form a Zwitter ion?
(a) Benzoic acid
Q. 17. What is formed when a primary alcohol undergoes catalytic dehydrogenation?
Q. 18. Which one is the complementary base of cytosine in one strand to that in other strand of DNA ?
Q. 19. The solubility product for a salt of the type AB is 4 × 10–8. What is the molarity of its standard solution?
(A) 2 × 10–4 mol/L
(B) 16 × 10–16 mol/L
(C) 2 × 10–16 mol/L
(D) 4 × 10–4 mol/L
Q. 20. Ethylidene chloride is a/an.
(C) allylic halide
(D) vinylic halide
Q. 21. Which of the following will NOT undergo SN1 reaction with OH ?
Q. 22. Which of the following is a free radical substitution reaction ?
(A) Benzene with Br2/AlCl3
(B) Acetylene with HBr
(C) Methane with Br2/hv
(D) Propene with HBr/(C6H5COO)2
Q. 23. The freezing point depression constant (Kr) of benzene is 5. 12 K kg mol–1. The freezing point depression for the solution of molality 0.078 m containing a non-electrolyte solute in benzene is rounded off upto two decimal places :
(A) 0.80 K
(B) 0.40 K
(C) 0.60 K
(D) 0.20 K
Q. 24. Sucrose on hydrolysis gives :
(A) a-D-Glucose + b-D-Glucose
(B) a-D-Glucose + b-D-Fructose
(C) a-D-Fructose + b-D-Fructose
(D) b-D-Glucose + a-D-Fructose
Q. 25. When there are deviations from ideal arrangement around a point or an atom in a crystalline
substance ,it is known as:
(A) point defect
(B) vacancy defect
(C) line defect
(D) interstitial defect
(A) Simple cubic unit cell
(B) Body centred cubic unit cell
(C) Face centred cubic unit cell
(D) End centred cubic unit cell
Q. 27. Which of the following alcohol will yield the corresponding alkyl chloride on reaction with concentrated HCl at room temperature?
Q. 28. Which one of the following does not exist?
Q. 29. In hcp unit cell, in two layers one above the other, what will be the coordination number of each sphere?
Q. 30. Reaction between benzaldehyde and acetophenone in presence of dilute NaOH is known as :
(A) Cannizzaro’s reaction
(B) Cross Cannizzaro’s reaction
(C) Cross Aldol condensation
(D) Aldol condensation
Q. 31. On a small scale, ammonium salts decompose when treated with _____________________to produce ammonia:
(A) calcium chloride
(B) sodium hydroxide
(C) sodium chloride
(D) caustic soda
Q. 32. The optimum pressure required for the production of ammonia is:
(A) 200 atm
(B) 400 atm
(C) 100 atm
(D) 300 atm
Q. 33. Which of the following is most acidic?
(A) Benzyl alcohol
Q. 34. Toluene reacts with a halogen in the presence of iron (III) chloride giving ortho and para halo compounds. The reaction is
(A) electrophilic elimination reaction
(B) electrophilic substitution reaction
(C) free radical addition reaction
(D) nucleophilic substitution reaction
Q. 35. In qualitative analysis when H2S is passed through an aqueous solution of salt acidified with dil.
HCl, a black precipitate is obtained. On boiling the precipitate with dil. HNO3 , it forms a solution of blue colour. Addition of excess of aqueous solution of ammonia to this solution gives _________.
(A) deep blue precipitate of Cu(OH)2
(B) deep blue solution of [Cu (NH3 )4]2+
(C) deep blue solution of Cu(NO3)2
(D) deep blue solution of Cu(OH)2 .Cu(NO3)2
Q. 36. The mixture which shows positive deviation from Raoult’s law is :
(A) Benzene + Toluene
(B) Acetone + Chloroform
(C) Chloroethane + Bromoethane
(D) Ethanol + Acetone
Q. 37. An element has a body centered cubic (bcc) structure with a cell edge of 288 pm. The atomic radius is :
Q. 38. Identify the incorrect statement.
(A) The transition metals and their compounds are known for their catalytic activity due to their ability to adopt multiple oxidation states and to form complexes.
(B) Interstitial compounds are those that are formed when small atoms like H, C or N are trapped inside the crystal lattices of metals.
(C) The oxidation states of chromium in CrO42– and Cr2O72– are not the same.
(D) Cr2+ (d4) is a stronger reducing agent than Fe2+ (d6) in water.
Q. 39. Affinity for hydrogen decreases in the group from fluorine to iodine. Which of the halogen acids should have highest bond dissociation enthalpy?
Q. 40. Which of the following compounds will react with sodium hydroxide solution in water?
Q. 41. What is the correct order of reactivity of alcohols in the following reaction?
(A) 1° > 2° > 3°
(B) 1° < 2° > 3°
(C) 3° > 2° > 1°
(D) 3° > 1° > 2°
Q. 42. Elimination reaction of 2-Bromo-pentane to form pent-2-ene is :
(A) b-Elimination reaction (B) Follows Zaitsev rule
(C) Dehydrohalogenation reaction (D) Dehydration reaction
(A) (a), (c), (d)
(B) (b), (c), (d)
(C) (a), (b), (d)
(D) (a), (b), (c)
Q. 43. How many alcohols with molecular formula C4H10O are chiral in nature?
Q. 44. Which reagent will you use for the following reaction?
CH3CH2CH2CH3 → CH3CH2CH2CH2Cl + CH3CH2CHClCH3
(A) Cl2/UV light
(B) NaCl + H2SO4
(C) Cl2 gas in dark
(D) Cl2 gas in the presence of iron in dark
From Q.45 to Q.49, Given below are two statements labelled as Assertion (A) and Reason (R) and at the end of each question give the following line select the most appropriate answers from the options given below :
(A) Both A and R are true and R is the correct explanation of A.
(B) Both A and R are true but R is NOT the correct explanation of A.
(C) A is true but R is false.
(D) A is false and R is true.
Q. 45. Assertion : Although PF5, PCl5 and PBr5 are known the pentahalides of nitrogen have not been observed.
Reason : Phosphorus has lower electronegativity than nitrogen.
Q. 46. Assertion : Bromobenzene upon reaction with Br2/Fe gives 1, 4-dibromobenzene as the major product.
Reason : In bromobenzne, the inductive effect of the bromo group is more dominant than the mesomeric effect in directing the incoming electrophile.
Q. 47. Assertion : The elements of group 18 are called inert gas.
Reason : The elements of group 18 are monoatomic in nature.
Q. 48. Assertion : Noble gases are chemically inert.
Reason : All noble gases have ns2np6 valence shell electronic configuration.
Q. 49. Assertion : Molecular mass of polymers cannot be calculated using boiling point or freezing point methods.
Reason : Polymer’s solution does not possess a constant boiling point or freezing point.
Q. 50. Sucrose (cane sugar) is a disaccharide. One molecule of sucrose on hydrolysis gives
(A) 2 molecules of glucose
(B) 2 molecules of glucose + 1 molecule of fructose
(C) 1 molecule of glucose + 1 molecule of fructose
(D) 2 molecules of fructose
Q. 51. Strong reducing behaviour of H3PO2 is due to
(A) Low oxidation state of phosphorus
(B) Presence of two –OH groups and one P–H
(C) Presence of one –OH group and two P–H bonds
(D) High electron gain enthalpy of phosphorus
Q. 52. Chlorobenzene is formed by reaction of chlorine with benzene in the presence of AlCl3. Which of the following species attacks the benzene ring in this reaction?
Case 1. Read the passage given below and answer the following questions 53-55.
Electrical properties of solids are measured in terms of conductivity. Conductivity may be defined as the ease with which electric current can pass through a given substance. Based on conduction of electricity, solids can be broadly divided into three categories: Conductors, semiconductors and insulators.
Conductors are the solids that allow easy passage of electric current through them. Metals are generally good conductors of electricity. Electrical conductivity in metals is due to the presence of mobile electrons. The conductivity of metals is of the order of 107(Ωm)–1. There is no gap between the conduction band and the valence band. Metals are generally good conductors of electricity.
In semiconductors, the gap between the conduction band and the valence band is very less. The conductivity of the semiconductors increases with an increase in temperature, for semiconductors, it lies in between 10–6 to 10–4 (Wm)–1. There are two types of semiconductors:
Intrinsic semiconductor : Example : Silicon, Germanium
Extrinsic semiconductor : Example : Silicon, Germanium doped with group 13 and group15elements.
In insulators, the materials do not conduct electricity. The band gap between the valence band and conduction band is very large. Even if a large amount of energy is provided to these solids, they do not conduct electricity. Example: Wood, plastics etc.
The following questions are multiple choice questions. Choose the most appropriate answer. Pick any four questions.
Q. 53. What is the attribute of a material which is the measure of flow of electricity known?
(C) Dielectric strength
Q. 54. Which one in responsible for electrical conductivity in Aluminium.
(A) Valence electron
(B) Free radical
(C) Free electron
(D) None of these
Q. 55. Which of the following represents the energy band diagram of a semiconducting material?