Category «Entrance Exams»

POLYMERS – 3

1) A synthetic polymer prepared by using caprolactam is known as a) Terylene b) Teflon c) Nylon-6 d) Neoprene 2) Plexiglass (PMMA) is a polymer of a) Acrylic acid b) Methyl acrylate c) Methyl methacrylate d) None of these 3) The compound used in the manufacture of terylene is a) Ethylene b) Vinyl chloride c) …

POLYMERS – 2

1) Which of the following is a natural polymer ? a) Nylon b) Bakelite c) Perspex d) Gutta percha 2) Nylon may be dyed with a) Acid dyes b) Basic dyes c) Both d) none 3) Pick out the incorrect statement; a) Silk and wools are polymers of proteins b) Starch and cellulose are the …

POLYMERS – 1

1) Which among the following is a polyester a) nylon b) bakelite c) terylene d) styrene 2) Which is not true of natural rubber? a) it is a polymer of isoprene b) it is a gummy material with poor elasticity c) it has no cross links d) cross linking exists in the natural form of …

P – BLOCK ELEMENTS – 22

1) The van der Waals forces in halogens increase in the order a) b) c) d) 2) Bleaching powder is a) b) CaCIO c) d) 3) Chlorine acts as a bleaching agent in the presence of a) Dry air b) Moisture c) Sunlight d) Pure oxygen 4) Euchlorine is a mixture of a) b) c) …

P – BLOCK ELEMENTS – 23

1) Cl2O6 is an anhydride of a) b) c) d) 2) The acidic nature of the oxides of chlorine increases a) As the oxidation number of chlorine decreases b) As the oxidation number of chlorine increases c) As the number of oxygen atoms in the oxide decreases d) None 3) Which of the following is …

P – BLOCK ELEMENTS – 24

1) Which of the following polymerization processes can be used to prepare polystyrene? a) Anionic b) Cationic c) Free radical d) All the above 2) Terylene is made by polymerization of terephthalic acid with a) Ethylene glycol b) Phenol c) Ethanol d) Catechol 3) Teflon, styron and neoprene are all a) Copolymers b) Condensation polymers …

P – BLOCK ELEMENTS – 21

1) @ The oxidation states of the most electronegative element in the products of the reaction of BaO2 with dil. H2SO4 are a) 0 and1 b) —1 and—2 c) —2 and 0 d) —2 and +1 2) Which of the following has the highest dipole moment? a) b) c) d) 3) Which of the following …

P – BLOCK ELEMENTS – 25

1) Chlorous acid and its salts (chlorites) are a) Good oxidising agents b) Good reducing agents c) Good bleaching agents d) Good oxidising and bleaching agents 2) Which of the following oxyanions of chlorine is most stable? a) b) c) d) 3) By the action of conc. HCl on potassium chlorate we get a) b) …