CBSE
Additional Practice Questions
Subject: Chemistry Theory (043)
Class: XII 2023-24
Max. marks: 70 Time: 3 hours
General Instructions:
(a) There are 33 questions in this question paper with internal choice.
(b) SECTION A comprises 16 multiple -choice questions carrying 1 mark each.
(c) SECTION B comprises 5 short answer questions carrying 2 marks each.
(d) SECTION C comprises 7 short answer questions carrying 3 marks each.
(e) SECTION D comprises 2 case - based questions carrying 4 marks each.
(f) SECTION E comprises 3 long answer questions carrying 5 marks each.
(g) All questions are compulsory.
(h) Use of log tables and calculators is not allowed.
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 Sunita set up three cells as shown below:
She applied external potential in all the three cells. The potential is increased slowly,
till the opposing voltage reaches the value of 1.1 V.
, Which of the following statements is INCORRECT?
(a) Electrons flow from Zn rod to Cu rod hence current flows from Cu to Zn in case (P).
(b) The chemical reaction takes place in case (Q) till the opposing voltage reaches 1.1
V.
(c) Zinc is deposited at the zinc electrode and copper dissolves at copper electrode in
case (P).
(d) Electrons flow from Cu to Zn and current flows from Zn to Cu in case (R).
2 Two compounds M and N have the general formula C nH2nO but different structural
formulae.
i) Compound N belongs to that homologous series where the first member contains 3
carbon atoms.
ii) Compound M reacts with one equivalent of monohydric alcohol in the presence of
dry hydrogen chloride to yield a hemiacetal.
Identify the homologous series to which compounds M and N belong to?
(a) Both the compounds are aldehydes.
(b) Compound M is an aldehyde and compound N is a ketone.
(c) Both the compounds are ketones.
(d) Compound N is an aldehyde and compound M is a ketone.
3 During a quiz competition, team A and team B have to answer a tie question on the
characteristics of RNA.
Their responses are as follows:
Name Team Response
Adrika A Different RNA molecules of a cell are involved in the synthesis of
proteins.
Shaakho A The single-stranded helix of RNA folds upon itself to form the
secondary structure.
Rounak B The C-2 atom of the pentose sugar for a ribose nucleotide
contains an -OH group.
Ritama B The message for the synthesis of a particular protein is present
only in the RNA.
What is the expected result of the quiz and why?
(a) Team A wins the quiz as both the responses are correct.
(b) Team B wins the quiz as both the responses are correct.
(c) Team A loses the quiz as Adrika's response is incorrect.
(d) Team B loses the quiz as Rounak's response is incorrect.
Additional Practice Questions
Subject: Chemistry Theory (043)
Class: XII 2023-24
Max. marks: 70 Time: 3 hours
General Instructions:
(a) There are 33 questions in this question paper with internal choice.
(b) SECTION A comprises 16 multiple -choice questions carrying 1 mark each.
(c) SECTION B comprises 5 short answer questions carrying 2 marks each.
(d) SECTION C comprises 7 short answer questions carrying 3 marks each.
(e) SECTION D comprises 2 case - based questions carrying 4 marks each.
(f) SECTION E comprises 3 long answer questions carrying 5 marks each.
(g) All questions are compulsory.
(h) Use of log tables and calculators is not allowed.
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 Sunita set up three cells as shown below:
She applied external potential in all the three cells. The potential is increased slowly,
till the opposing voltage reaches the value of 1.1 V.
, Which of the following statements is INCORRECT?
(a) Electrons flow from Zn rod to Cu rod hence current flows from Cu to Zn in case (P).
(b) The chemical reaction takes place in case (Q) till the opposing voltage reaches 1.1
V.
(c) Zinc is deposited at the zinc electrode and copper dissolves at copper electrode in
case (P).
(d) Electrons flow from Cu to Zn and current flows from Zn to Cu in case (R).
2 Two compounds M and N have the general formula C nH2nO but different structural
formulae.
i) Compound N belongs to that homologous series where the first member contains 3
carbon atoms.
ii) Compound M reacts with one equivalent of monohydric alcohol in the presence of
dry hydrogen chloride to yield a hemiacetal.
Identify the homologous series to which compounds M and N belong to?
(a) Both the compounds are aldehydes.
(b) Compound M is an aldehyde and compound N is a ketone.
(c) Both the compounds are ketones.
(d) Compound N is an aldehyde and compound M is a ketone.
3 During a quiz competition, team A and team B have to answer a tie question on the
characteristics of RNA.
Their responses are as follows:
Name Team Response
Adrika A Different RNA molecules of a cell are involved in the synthesis of
proteins.
Shaakho A The single-stranded helix of RNA folds upon itself to form the
secondary structure.
Rounak B The C-2 atom of the pentose sugar for a ribose nucleotide
contains an -OH group.
Ritama B The message for the synthesis of a particular protein is present
only in the RNA.
What is the expected result of the quiz and why?
(a) Team A wins the quiz as both the responses are correct.
(b) Team B wins the quiz as both the responses are correct.
(c) Team A loses the quiz as Adrika's response is incorrect.
(d) Team B loses the quiz as Rounak's response is incorrect.
