SSK/3/Set 4

CBSE Class XII Chemistry Board Paper (Term 1 – 2021)

Time: 90 minutes

Total Marks: 35

General Instructions:

This question paper contains, 55 questions out of which 45 questions are to be attempted

All question carry equal marks.

This question paper consists of three Sections - Section A, B, and C.

• Section A contains 25 questions Attempt any 20 question from Q. No. 1 to 25.

Section B contains 24 questions Attempt any 20 questions from Q. No. 26 to 49.

Section C contains 6 questions Attempt any 5 questions from Q. No. 50 to 55.

• The first 20 questions attempted in Section A and Section B and first 5 questions attempted in Section C by a candidate will be evaluated.

There is only one correct option for emery multiple choice question (MCQ). Marks will not be awarded for answering more than one option.

There is no negative marking.

SECTION A

This section consists of 25 multiple choice questions with overall choice to attempt any 20 questions. In caw more than desirable number of questions are attempted. ONLY first 20 will be considered for evaluation.

1. Which one of the following pairs will form an ideal solutions?
2. Chloroform and acetone
3. Ethanol and acetone
4. n-hexane and n-heptane
5. Phenol and aniline

1. Which of the following is known as amorphous solid?
2. Glass
3. Plastic
4. Rubber
5. All of the above

1. The structure of pyrosulphuric acid is
2. HO——S—O——OH

1. HO −OH

1. HO

C

1. HO -OH

1. The C-O-H bond angle in alcohol is
2. Slightly greater than 109°28'.
3. Slightly less than 109°28'.
4. Slightly greater than 120°
5. Slightly less than 120°

1. Consider the following reaction:

<math>CH_3</math>—CH = <math>CH_2</math> <math>\frac{1.HBr}{2. aq. KOH}</math>

The major end product is

1. CH₃—CH—CH₃<br>|<br>OH

<math>CH_3</math>—CH—<math>CH_3</math> (B) |<br>Br

1. CH₃-CH₂-CH₂-OH
2. CH₃-CH₂-CH₂-Br

1. Nucleosides are composed of
2. a pentose sugar and phosphoric acid
3. a nitrogenous base and phosphoric acid
4. a nitrogenous base and a pentose sugar
5. a nitrogenous base, a pentose sugar and phosphoric acid

1. The oxidation state of -2 is most stable in:
2. O
3. S
4. Se
5. Te