RBSE Class 12 Chemistry Model Paper 5 English Medium

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RBSE Class 12 Chemistry Model Paper 5 English Medium are part of RBSE Class 12 Chemistry Board Model Papers. Here we have given RBSE Class 12 Chemistry Sample Paper 5 English Medium.

Board RBSE
Textbook SIERT, Rajasthan
Class Class 12
Subject Chemistry
Paper Set Model Paper 5
Category RBSE Model Papers

RBSE Class 12 Chemistry Sample Paper 5 English Medium

Time: 3¼ Hours
Maxim Marks: 80

General Instructions to the Examinees:

  1. Candidate must write first his/her Roll No. on the question paper compulsorily.
  2. All the questions are compulsory.
  3. Write the answer to each question in the given answer-book only,
  4. For questions having more than one part, the answer to those parts are to be written together in continuity.
  5. If there is any error/difference/contradiction in Hindi & English version of the question paper, the question of Hindi version should be treated valid.
  6. Question Nos. Marks Per Questions
    1 – 13 1
    14 – 24 2
    25 – 27 3
    28 – 30 4
  7. Question Nos. 21, 27, 28, 29 and 30 have internal choices.

SECTION-A

Question 1.
What is a semiconductor? Give an example. [1]

Question 2.
Write the van’t Hoff’s equation for dilute solutions. [1]

Question 3.
What form will Freundlich adsorption isotherm equation take at higher pressure? [1]

RBSE Class 12 Chemistry Model Paper 5 English Medium

Question 4.
Why are transition metal compound coloured. [1]

Question 5.
In the d-block element name the elements which donot generally show the characteristics of transition elements. [1]

Question 6.
The paramagnetic character in 3d series elements increases up to manganese and then decreases, What is the reason? [1]

Question 7.
Write the geometrical isomers of [Pt(NH3)4Cl2]2+ [1]

Question 8.
Predict the product of the following reaction [1]

  1. CH3CH2Br + KCN   \(\underrightarrow { aq.alcohol } \)
  2. CH3CH2Br + KNO2 \(\underrightarrow { aq.alcohol } \)

Question 9.
Diethyl ether is obtained from ethyl bromide by treating with sodium ethoxide. What is the name of this reaction? [1]

Question 10.
Which compound is formed by chlorination of toluene in presence of light followed by treatment with aq. NaOH solution? [1]

RBSE Class 12 Chemistry Model Paper 5 English Medium

Question 11.
What is Ziegler-Natta catalyst? [1]

Question 12.
Which of the following are optically active? [1]

  1. Butan-2-ol
  2. 3-chloropentane
  3. 2-chlorobutane

Question 13.
Give an example of a cationic detergent. [1]

SECTION – B

Question 14.
(a) What happens to anti-ferromagnetic or ferromagnetic solid on heating?
(b) What type of point defect is produced when AgCl is doped with CdCl2? [1 + 1 = 2]

Question 15.
(a) When the liquids A and B are mixed the solution becomes warm. Which type of deviation from Raoult’s law is exhibited?
(b) Draw the vapour pressure graph showing positive deviation. [1 + 1 = 2]

Question 16.
(a) Write the name of electrolyte used in

  1. Fuel cell
  2. mercury cell.

(b) Write the Nemst equation to calculate the cell potential of
Mg(s)|Mg2+(aq)||Ag+(aq)|Ag. [1 + 1 = 2]

RBSE Class 12 Chemistry Model Paper 5 English Medium

Question 17.
A cell is prepared by dipping a copper rod is 1 M CuSO4 solution and a nickel rod in 1 M NiSO4 solution. The standard electrode potentials of copper electrode and nickel electrode are 0.34 V and -0.25V respectively. Write the cell reaction & calculate the emf of cell. [2]

Question 18.
(a) Out of zinc and iron scraps, which ore is suitable to reduce leached low-grade copper ore & why?
(b) How is bauxite leached to get pure alumina? [1 + 1 = 2]

Question 19.
Account for the fact that [Ni(CO)4] has tetrahedral geometry where as [Ni(CN)4]2- has square planar geometry. [2]

Question 20.
Although chlorine is an electron with drawing group, yet it is ortho-and para-directing in electrophilic aromatic substitution reactions. Give reason. [2]

Question 21.
(a) Boiling point of carboxylic acids are higher then aldehydes and ketones of comparable molecular masses. Why.
(b) Draw the dimer structure of ethanoic acid in vapour state. [1 + 1 = 2]

OR

(a) For which group identification Tollen’s test is used. Give chemical equation.
(b) Give one difference between Clemmensen and Wolf-Kishner reduction. [1 + 1 = 2]

Question 22.
What are natural and synthetic polymers? Give one example of each. [2]

Question 23.
(a) Distinguish between conformation and configuration.
(b) Draw various conformation of ethane and which of them is more stable. [1 + 1 = 2]

RBSE Class 12 Chemistry Model Paper 5 English Medium

Question 24.
(a) Write any one difference between broad spectrum and narrow spectrum antibiotics
(b) Explain antiseptics. [1 + 1 = 2]

SECTION – C

Question 25.
(a) Explain Tyndal effect with labeled diagram.
(b) What happens when H2S gas is passed through dilute solution of arsenious oxide in water? [2 + 1 = 3]

Question 26.
(a) What do you understand by glucoside linkage? Explain. [2 + 1 = 3]
(b) What are hydrolysis product of

  1. sucrose and
  2. lactose?

Question 27.
(a) Arrange the following compounds in gaseous phase in the increasing order of basicity
C2H5NH2, (C2H5)2NH, (C2H5)3N, CH3NH2.
(b) Write the IUPAC name of the following compounds [2 + 1 = 3]

  1. C6H5NHCH3
  2. CH3NH CH(CH3)2

OR

(a) Convert benzene to aniline using the following reagent in correct order. Alkaline KMnO4 followed by HCl, NH3, heat, Br2/ KOH, CH3Cl + Anh. AlCl3. [2 + 1 = 3]
(b) Ethylamine is soluble in water whereas aniline in not.

RBSE Class 12 Chemistry Model Paper 5 English Medium

SECTION – D

Question 28.
(a)

  1. Express the rates of following reaction in terms of different reactants and products.
    5Br– (aq) + BrO3– (aq) + 6H+(aq) → 3Br2(aq) + 3H2O(l)
  2. Write examples of two instantaneous reactions [2 + 2 = 4]

(b) The reaction 2N2O5(g) ⇌ 4NO2(g) + O2(g) was carried out in a closed vessel. It was found that the concentration of N02 increased by 2.0 x 10-2 mol L-1 in five seconds. Calculate

  1. the rate of reaction and
  2. the rate of change of concentration of N2O5.

OR

(a) What is the relation between thresh hold energy, activation energy and energy of reactants.
(b) Draw the reaction profile of an exothermic reaction.
(c) Rate constant of a first order reaction,
A → product is 0.016 min-1. Calculate the time required for 80% of the reaction to be completed.

Question 29.
(a) Write the balanced equation when NH3 is dissolved in water
(b) What is fuming nitric acid? What is its colour.
(c) Write the reaction of white phosphorus with cone. HNO3 in an inert atmosphere of CO2 gas
(d) Write the reaction of PCl5. with CH3COOH. [1 + 1 + 1 + 1 = 4]

OR

(a) Draw the structure of XeOF4. What is this shape.
(b) Boiling point of PH3 is less than NH3. Give reason.
(c) Write an equation of chlorine with water.
(d) Give a method of preparation of oxygen. [1 + 1 + 1 + 1 = 4]

Question 30.
(a) Draw the structure of [1 + 1 + 2 = 4]

  1. Phenyl methanol and
  2. Ethane-1.2-diol.

(b) What happens when methanol is heated with HI in presence of red phosphorus?
(c) State and explain Gattermann reaction.

OR

(a) What type of hybridisation is involved in the C-OH bond of alcohols and phenols?
(b) What happens when phenol is oxidised by acidified K2Cr2O7 solution?
(c) How will you distinguish 1°, 2° and 3° alcohols by Luca’s test? [1 + 1 + 2 = 4]

RBSE Class 12 Chemistry Model Paper 5 English Medium

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