Test Yourself For CBSE Class XII Board 2024: Solve Class XII Chemistry MCQs From SQPs

CBSE class XII examination is around the corner. This is surely the time to focus rather than panicking. Concentrate on studies, and you will definitely achieve your goal.

At this time, constant revision of what you have studied is crucial. The questions below will test your preparedness level, and also give an idea of the kind of questions that may be asked.

The CBSE Class 12 Chemistry paper will have 33 questions divided into 5 sections.

SECTION A consists of 16 multiple -choice questions carrying 1 mark each.
SECTION B consists of 5 short answer questions carrying 2 marks each.
SECTION C consists of 7 short answer questions carrying 3 marks each.
SECTION D consists of 2 case - based questions carrying 4 marks each.
SECTION E consists of 3 long answer questions carrying 5 marks each.

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The following 1 mark questions of Class 12 Chemistry have been taken from past sample questions papers of CBSE so, rest assured about the authenticity. The answers have been provided at the end.

Q1. Which of the following statement is true?

(a) molecularity of reaction can be zero or a fraction.

(b) molecularity has no meaning for complex reactions.

(c) molecularity of a reaction is an experimental quantity

(d) reactions with the molecularity three are very rare but are fast

Q2. Which one of the following compounds is more reactive towards SN1 reaction?

a. CH2=CHCH2Br

b. C6H5CH2Br

c. C6H5CH (C6H5)Br

d. C6H5CH(CH3) Br

Q3. ZnO crystal on heating acquires the formula Zn 1+x O. Give reason.

Q4. Which of the following observation is shown by 2 -phenyl ethanol with Lucas Reagent?

(a) Turbidity will be observed within five minutes

(b) No turbidity will be observed

(c) Turbidity will be observed immediately

(d) Turbidity will be observed at room temperature but will disappear after five minutes.

Q5. Which of the following tests/ reactions is given by aldehydes as well as ketones?

a. Fehling¡¯s test

b. Tollen¡¯s test

c. 2,4 DNP test

d. Cannizzaro reaction

Q6. Low spin configuration are rarely observed in tetrahedral coordination entity formation. Explain.

Q7. Given below are two statements labelled as Assertion (A) and Reason (R)

Assertion (A): During electrolysis of aqueous copper sulphate solution using copper electrodes hydrogen gas is released at the cathode.
Reason (R): The electrode potential of Cu2+ /Cu is greater than that of H +/H 2

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

Q8. Arrhenius equation can be represented graphically as follows:

CBSE Class XII SQP 2022-23

The (i) intercept and (ii) slope of the graph are:

a. (i) ln A (ii) Ea/R

b. (i) A (ii) Ea

c. (i)ln A (ii) - Ea/R

d. (i) A (ii) -Ea

Q9. Anisole undergoes bromination with bromine in ethanoic acid even in the absence of iron (III) bromide catalyst

(a) Due to the activation of benzene ring by the methoxy group.

(b) Due to the de-activation of benzene ring by the methoxy group.

(c) Due to the increase in electron density at ortho and para positions

(d) Due to the formation of stable carbocation

Q10. The oxidation of toluene to benzaldehyde by chromyl chloride is called

a. Etard reaction

b. Riemer-Tiemann reaction

c. Stephen¡¯s reaction

d. Cannizzaro¡¯s reaction

ANSWERS

Ans1. (b) molecularity has no meaning for complex reactions.

Ans2. (c) C6H5CH (C6H5)Br

C6H5CH (C6H5)+ carbocation formed is more stable

Ans3. On heating ZnO , it loses oxygen and there is excess of Zn2+ions in the crystal.

Ans4. (b) no turbidity will be observed, given compound is a primary alcohol

Ans5. (c) 2,4 DNP test Fehling¡¯s, Tollen¡¯s and Cannizzao reaction is shown by alcohols only.

Ans6. The orbital splitting energies, ¦¤t are not sufficiently large for forcing pairing of electrons in the tetrahedral coordination entity formation.

Ans7. (d) A is false but R is true. Cu will deposit at cathode.

Ans8. c. (i)ln A (ii) - Ea/R

Ans9. (a) Due to the activation of benzene ring by the methoxy group.

Ans10. A Etard reaction

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