Board Paper of Class 12-Science 2021 Chemistry Term-I Delhi(Set 4) (Series : SSK/3) - Solutions
General Instructions :
1. This question paper contains 55 questions out of which 45 questions are to be attempted.
2. All questions carry equal marks.
3. This question paper consists of three Sections - Section A, B and C.
4. Section A contains 25 questions. Attempt any 20 questions from Q. No. 01 to 25.
5. Section B contains 24 questions. Attempt any 20 questions from Q. No. 26 to 49.
6. Section C contains 6 questions. Attempt any 5 questions from Q. No. 50 to 55.
7. 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.
8. There is only one correct option for every multiple choice question (MCQ). Marks will not be awarded for answering more than one option.
9. There is no negative marking.
1. This question paper contains 55 questions out of which 45 questions are to be attempted.
2. All questions carry equal marks.
3. This question paper consists of three Sections - Section A, B and C.
4. Section A contains 25 questions. Attempt any 20 questions from Q. No. 01 to 25.
5. Section B contains 24 questions. Attempt any 20 questions from Q. No. 26 to 49.
6. Section C contains 6 questions. Attempt any 5 questions from Q. No. 50 to 55.
7. 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.
8. There is only one correct option for every multiple choice question (MCQ). Marks will not be awarded for answering more than one option.
9. There is no negative marking.
- Question 1
Which one of the following pairs will form an ideal solution?
(A) Chloroform and acetone
(B) Ethanol and acetone
(C) n-hexane and n-heptane
(D) Phenol and aniline VIEW SOLUTION
- Question 2
Which of the following is known as amorphous solid?
(A) Glass
(B) Plastic
(C) Rubber
(D) All of the above VIEW SOLUTION
- Question 3
- Question 4
The C–O–H bond angle in alcohol is
(A) slightly greater than 109°28'.
(B) slightly less than 109° 28'.
(C) slightly greater than 120°.
(D) slightly less than 120°. VIEW SOLUTION
- Question 5
- Question 6
Nucleosides are composed of
(A) a pentose sugar and phosphoric acid
(B) a nitrogenous base and phosphoric acid
(C) a nitrogenous base and a pentose sugar
(D) a nitrogenous base, a pentose sugar and phosphoric acid VIEW SOLUTION
- Question 7
- Question 8
Which of the following is not a characteristic of a crystalline solid?
(A) A true solid
(B) A regular arrangement of constituent particles
(C) Sharp melting point
(D) Isotropic in nature VIEW SOLUTION
- Question 9
Which of the following formula represents Raoult's law for a solution containing non-volatile solute?
(A) Psolute = Posolute · Xsolute
(B) P = KH.X
(C) PTotal = Psolvent
(D) Psolute = Posolvent · Xsolvent VIEW SOLUTION
- Question 10
An azeotropic solution of two liquids has a boiling point lower than either of the two when it
(A) shows a positive deviation from Raoult's law
(B) shows a negative deviation from Raoult's law.
(C) shows no deviation from Raoult's law.
(D) is saturated. VIEW SOLUTION
- Question 11
Which of the following crystal will show metal excess defect due to extra cation?
(A) AgCl
(B) NaCl
(C) FeO
(D) ZnO VIEW SOLUTION
- Question 12
Which of the following acids reacts with acetic anhydride to form a compound Aspirin?
(A) Benzoic acid
(B) Salicylic acid
(C) Phthalic acid
(D) Acetic acid VIEW SOLUTION
- Question 13
Which of the following statements is wrong?
(A) Oxygen shows pπ-pπ bonding.
(B) Sulphur shows little tendency of catenation.
(C) Oxygen is diatomic whereas sulphur is polyatomic.
(D) O–O bond is strong than S-S bond. VIEW SOLUTION
- Question 14
Amino acids which cannot be synthesized in the body and must be obtained through diet are known as
(A) Acidic amino acids
(B) Essential amino acids
(C) Basic amino acids
(D) Non-essential amino acids VIEW SOLUTION
- Question 15
Which one of the following halides contains Csp2–X bond?
(A) Allyl halide
(B) Alkyl halide
(C) Benzyl halide
(D) Vinyl halide VIEW SOLUTION
- Question 16
On mixing 20 mL of acetone with 30 mL of chloroform, the total volume of the solution is
(A) < 50 mL
(B) = 50 mL
(C) > 50 mL
(D) = 10 mL VIEW SOLUTION
- Question 17
Consider the following compounds :
the correct order of reactivity towards reaction
(A) I > III > II
(B) II > III > I
(C) II > I > III
(D) III > I > II VIEW SOLUTION
- Question 18
- Question 19
acts as a strong oxidising agent due to
(A) low and low
(B) low and high
(C) high and high
(D) low and low VIEW SOLUTION
- Question 20
Which of the following sugar is known as dextrose?
(A) Glucose
(B) Fructose
(C) Ribose
(D) Sucrose VIEW SOLUTION
- Question 21
- Question 22
- Question 23
- Question 24
Chlorine reacts with cold and dilute NaOH to give
(A) NaCl and NaClO3
(B) NaCl and NaClO
(C) NaCl and NaClO4
(D) NaClO and NaClO3 VIEW SOLUTION
- Question 25
Elevation of boiling point is inversely proportional to
(A) molal elevation constant (Kb)
(B) molality (m)
(C) molar mass of solute (M)
(D) weight of solute (W) VIEW SOLUTION
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