Term-2 JNV Pre Board Question Paper MS 23.3.2022

Class 12 Pre Board Question Papers 2022
with Marking Scheme / Answer Key, Biology And Accountancy
Jawahar Navodaya Vidyalaya

Practical Examination Question Paper Term-II 2022 CBSE, India

Practical Examination Sample Question Paper 1st Term-II 2022 CBSE, India
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AISSCE ( CHEMISTRY PRACTICAL EXAMINATION ) 2022
Subject:- Chemistry Subject Code: – 043 Name of School :- School Code:-
Time :- 3 hours                                       M.M. : 15
Instructions :
1.Question number 1,2 and 3 to be performed in the lab.
2.All question are compulsory.
3.Perform the given experiment and report that in examination note book systematically.
4.Use all precaution measures while working in the lab and protect your note book from chemicals, burn etc.
Questions are as follows-
Q1. Find out the molarity and strength in g/L of given unknown KMnO₄ solution by using M/20 Mohr salt solution. ( Solutions of different Concentrations should be given to students, therefore prepare at least two to four of solution of KMnO4 should prepare )
AND / OR
Find out the molarity and strength in g / l of given unknown KMnO₄ solution by using M/20 Oxalic Acid solution.                 (4)
Q2.   To detect the presence of one cation and anion in given salt.           (4)
Q3.   Identify the functional group present in the given organic compound.      (2)
Q4.    Investigatory Project and viva –voice                            (5)
Sign of Internal Examiner  ….……………… Sign of External Examiner………………………..
Name of Internal Examiner………………… Name of External Examiner………………………
Internal Examiner number    ……………….. External Examine number………………………
( Note:-1.Colourless salts should be preferred . 2.Distribute salts randomly. 3.Try to give cations and anions from each group 4. Distribute organic functional groups randomly.)
Alok Sharma , PGT Chemistry

Detection of functional group in a given organic compound Class 12 (CBSE) Practical

(Detection of Functional Group In given Unknown Organic Sample)
It carries 2 marks in CBSE Class 12 Science Practical Term II Examination 2021-22 session
Aim :- To detect the Functional Group In given Unknown Organic Sample.
PHYSICAL PROPERTIES
Colour:- Colourless
State:- Liquid.
Odour:- Specific (Like Nail paint remover )
Observation Table:-

S N	EXPERIMENT	OBSERVATION	INFERENCE
1	The sample + alkaline KMnO4 solution is added drop wise to it.	Pink colour does not disappear.	Unsaturation ( Carbon-carbon double / triple bond) is not present in the sample.
2.	Sample is dissolved in water and dip blue litmus paper in it or add few drops of solution on blue litmus paper with clean dropper.	No change in colour.	– OH (Phenolic) or — COOH ( Carboxylic ) functional group is absent.
3.	The sample is dissolved in water and dip blue litmus paper in it or add few drops of solution on blue litmus paper with clean dropper.	No change in colour.	– NH2 ( Amine ) functional group is absent.
4	Small amount of the sample + 2,4 DNP solution + shake + (heat if required)	Yellow precipitate appears	Presence of carbonyl ( C=O ) group is confirmed. Means either aldehyde or Ketone may present.
5	Small amount of the sample +Tollen,s reagent + heat	Silver mirror ( surface of test tube becomes shiny due to deposition of silver on glass surface or black precipitate appear in test tube if silver is unable to form deposited itself on surface of test tube.	Presence of aldehyde ( -CHO ) functional group is confirmed.
6	Small amount of the sample +Mixture of Fehling solution A and B + heat	Red precipitate appears	Presence of aldehyde ( -CHO ) functional group is confirmed.
7	Small amount of the sample + Sodium nitropruside solution + add NaOH dropwise	Red colour appears	C=O (Ketone ) functional group is absent.

Alok Sharma, PGT Chemistry

Result:- The aldehyde functional group is present in the given unknown organic compound.

Answer Key 12 Chemistry Term 1 CBSE 2021-22

14.12.2021 Download pdf of question paper and view possible answer key of Class 12 Chemistry Term 1 2021-22 (Bilingual -हिन्दी and English )
कक्षा 12 का टर्म प्रथम का गणित का प्रश्न पत्र यहां से डाउनलोड करे या नीचे गैलरी मे देखे तथा सम्भावित उत्तर कुंजी नीचे देखे । द्विभाषी- हिन्दी व अंग्रेजी में।
Subject code 041, Question Paper code 056 /2/4, Series SSJ/2.

Q. No.	Answer	Q. No.	Answer	Q. No.	Answer	Q. No.	Answer
1	B	18	C	35	B	52	A
2	C	19	B	36	C	53	B
3	A	20	D	37	D	54	A
4	D	21	A	38	B	55	C
5	C	22	C	39	A	…….	,,,,,,,,
6	B	23	D	40	C
7	D	24	B	41	D
8	A	25	A	42	B
9	D	26	C	43	D
10	C	27	B	44	C
11	B	28	D	45	C
12	A	29	B	46	A
13	B	30	A	47	B
14	A	31	C	48	B
15	C	32	A	49	A
16	D	33	B	50	C
17	A	34	D	51	D