Polymers & Everyday Chemistry · JEE Main previous year questions

2020 6 questions

1. Q702020 · 6 Sept 2020 · Shift 1

   Consider the Assertion and Reason given below. Assertion (A) : Ethene polymerized in the presence of Ziegler Natta Catalyst at high temperature and pressure is used to make buckets and dustbins. Reason (R) : High density polymers are closely packed and are chemically inert. Choose the correct answer from the following:

   1. A.Both (A) and (R) are correct and (R) is the correct explanation of (A).
   2. B.Both (A) and (R) are correct but (R) is not the correct explanation of (A).
   3. C.(A) is correct but (R) is wrong.
   4. D.(A) and (R) both are wrong.
   Show answer

   Answer: A

2. Q652020 · 6 Sept 2020 · Shift 2

   The correct match between Item - I and Item - II is : | Item - I | Item - II | | :--- | :--- | | (a) Natural rubber | (I) 1, 3-butadiene + styrene | | (b) Neoprene | (II) 1, 3-butadiene + acrylonitrile | | (c) Buna-N | (III) Chloroprene | | (d) Buna-S | (IV) Isoprene |

   1. A.(a) - (IV), (b) - (III), (c) - (II), (d) - (I)
   2. B.(a) - (III), (b) - (IV), (c) - (I), (d) - (II)
   3. C.(a) - (III), (b) - (IV), (c) - (II), (d) - (I)
   4. D.(a) - (IV), (b) - (III), (c) - (I), (d) - (II)
   Show answer

   Answer: A

3. Q672020 · 3 Sept 2020 · Shift 1

   The antifertility drug "Novestrol" can react with :

   1. A.$\mathrm{B}{\mathrm{r}}_2/water;\mathrm{ZnC}{\mathrm{l}}_2/HCl;\mathrm{FeC}{\mathrm{l}}_3$
   2. B.$\mathrm{B}{\mathrm{r}}_2/water;\mathrm{ZnC}{\mathrm{l}}_2/HCl;\mathrm{NaOCl}$
   3. C.$\mathrm{Alcoholic}\mathrm{HCN};\mathrm{NaOCl};\mathrm{ZnC}{\mathrm{l}}_2/HCl$
   4. D.$\mathrm{ZnC}{\mathrm{l}}_2/HCl;\mathrm{FeC}{\mathrm{l}}_3;\mathrm{Alcoholic}\mathrm{HCN}$
   Show answer

   Answer: A

4. Q702020 · 3 Sept 2020 · Shift 2

   Match the following drugs with their therapeutic actions : $$\begin{array}{ll}\text{(i) Ranitidine}& \text{(a) Antidepressant}\\ \text{(ii) Nardil}& \text{(b) Antibiotic}\\ \text{(Phenelzine)}& \\ \text{(iii)Chloramphenicol}& \text{(c) Antihistamine}\\ \text{(iv)Dimetane}& \text{(d) Antacid}\\ \text{(Brompheniramine)}& \\ & \text{(e) Analgesic}\end{array}$$

   1. A.(i)-(a); (ii)-(c); (iii)-(b); (iv)-(e)
   2. B.(i)-(e); (ii)-(a); (iii)-(c); (iv)-(d)
   3. C.(i)-(d); (ii)-(a); (iii)-(b); (iv)-(c)
   4. D.(i)-(d); (ii)-(c); (iii)-(a); (iv)-(e)
   Show answer

   Answer: C

5. Q672020 · 9 Jan 2020 · Shift 2

   Which polymer has 'chiral' monomer(s) ?

   1. A.Nylon 6,6
   2. B.Buna-N
   3. C.PHBV
   4. D.Neoprene
   Show answer

   Answer: C

6. Q692020 · 8 Jan 2020 · Shift 2

   Preparation of Bakelite proceeds via reactions.

   1. A.Electrophilic substitution and dehydration
   2. B.Condensation and elimination
   3. C.Nucleophilic addition and dehydration
   4. D.Electrophilic addition and dehydration
   Show answer

   Answer: A