Organisation : Central Board of Secondary Education (CBSE)
Class Name : 12th/HSC (Class XII)
Subject : Chemistry
Download : Sample Question Paper 2024-25
Website : https://cbseacademic.nic.in//SQP_CLASSXII_2024-25.html
CBSE Class XII Chemistry Sample Question Paper
Central Board of Secondary Education (CBSE) Class XII Chemistry Sample Question Paper 2024-25
Section-A:
The following questions are multiple-choice questions with one correct answer. Each question carries 1 mark. There is no internal choice in this section.
1. Ammonolysis of ethyl chloride followed by reaction of the amine so formed with 1 mole of methyl chloride gives an amine that
a. reacts with Hinsberg reagent to form a product soluble in an alkali.
b. on reaction with Nitrous acid, produced nitrogen gas.
c. reacts with Benzenesulphonyl chloride to form a product that is insoluble in alkali.
d. does not react with Hinsberg reagent.
2 Which one of the following has the highest dipole moment?
a. CH3F
b. CH3Cl
c. CH3I
d. CH3B
3. The initial concentration of R in the reaction RP is 4.62 x 10-2 mol/L. What is the half life for the reaction if k = 2.31x 10-2 molL-1s-1
a. 30 s
b. 3 s
c. 1 s
d. 10 s
4. When C6H5COOCOCH3 is treated with H2O , the product obtained is :
a. Benzoic acid and ethanol
b. Benzoic acid and ethanoic acid
c. Acetic Acid and phenol
d. Benzoic anhydride and methanol
5. Which of the following contains only β-D- glucose as its monosaccharide unit:
a. Sucrose
b. Cellulose
c. Starch
d. Maltose
6. Which one of the following sets correctly represents the increase in the paramagnetic property of the ions?
a. Ti3+< Fe2+ < Cr3+ < Mn2+
b. Ti3+< Mn2+< Fe2+ < Cr3+
c. Mn2+< Fe2+< Cr3+<Ti3+
d. Ti3+< Cr3+< Fe2+ < Mn2+
7. A first-order reaction is found to have a rate constant, k = 5.5 × 10-14 s-1. The time taken for completion of the reaction is:
a. 1.26 x 1013 s
b. 2.52 x 1013 s
c. 0.63 x 1013 s
d. It never goes to completion
8.A student was preparing aniline in the lab. She took a compound “X” and reduced it in the presence of Ni as a catalyst. What could be the compound “X”
a. Nitrobenzene
b. 1-Nitrohexane
c. Benzonitrile
d. 1-Hexanenitrile
9. Which of the following compound gives an oxime with hydroxylamine:
a. CH3COCH3
b. CH3COOH
c. (CH3CO)2O
d. CH3COCl
10. Assertion (A): [Mn(CN)6]3– has a magnetic moment of two unpaired electrons while [MnCl6]3– has a paramagnetic moment of four unpaired electrons.
Reason (R): [Mn(CN)6]3– is inner orbital complexes involving d2sp3 hybridisation,on the other hand, [MnCl6]3– is outer orbital complexes involving sp3d2 hybridisation.
Select the most appropriate answer 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 but R is true.
11. Assertion (A): For strong electrolytes, there is a slow increase in molar conductivity with dilution and can be represented by the equation
Reason (R): The value of the constant ‘A’ for NaCl, CaCl2, and MgSO4 in a given solvent and at a given temperature is different. Select the most appropriate answer 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 but R is true.
12. Assertion (A) Glucose does not form the hydrogensulphite addition product with NaHSO3 .
Reason (R): Glucose exists in a six-membered cyclic structure called pyranose structure.
Select the most appropriate answer 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 but R is true.
13. Assertion (A): The half- life for a zero order reaction is independent of the initial concentration of the reactant.
Reason (R): For a zero order reaction, Rate = k
Select the most appropriate answer 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 but R is true
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