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Q5) The monomers of terylene are [ AFMC 2002]




SOLUTION


Answer: (d)


Q6) Nylon is a ... [ AFMC 2003]




SOLUTION

Nylon has -CONH- group linkage
Answer: (c)


Q7) Which of the following is a basic dye? [ AFMC 2004]



SOLUTION

Basic dyes have slats of amino or substituted aminio group ( -NH2 or -NR2) which in acidic solution forms water soluble cations. These dyes attack athe anionic sites present on the fabrics and then get attached to tem. These are used to dye modified nylon and polyesters, e.g. aniline yellow, malachite green etc
Answer:(b)



Q8) Three dimensional molecules with cros links are formed in the case of a ... [ AFMC 2007]



SOLUTION

Thermosetting plastic consist of chain molecules which are chemically bonded, or cross-linked, with each other when heated. When thermosetting plastics cross-link, the molecules create a permanant, 3-D network that can be considered one giant molecule. Once cured, thermosetting plastic cn not be remelted, in the same way that cured concrete cannot be reset.
Answer: (b)


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