RBSE Class 12 Chemistry Model Paper 5 English Medium

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]

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]

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]

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]

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.

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]

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