Read the given passage and fill in the blanks by selecting an appropriate option. Cellulose is a naturally occurring fibre. The walls of `ul(" (i) ")` are made of cellulose. It is used in making a synthetic fibre `ul(" (ii) ")` which resembles the most expensive natural fibre `ul(" (iii) ")` in appearance hence, it is also called `ul(" (iv) ")`.
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Read the given passage and fill in the blanks by choosing an appropriate option. When a mixture of two ul(" (i) ") liquids having a difference of 25^(@)C in their boiling points is to be separated, a ul(" (ii) ") is used which increases the ul(" (iii) ") surface area. As a result, when the vapours of both the liquids rise, the ul(" (iv) ") volatile liquid will condense while the vapours of ul(" (v) ") volatile liquid will rise.
Read the given passage and fill in the blanks by selecting an appropriate option. Bleaching powder is a ul(" (i) ") powder. When exposed to air, it reacts with ul(" (ii) ") of the air to liberate Cl_(2) gas. It is ul(" (iii) ") in cold water and milkiness of the solution is due to presence of unreacted ul(" (iv) ") . It reacts with HCl and H_(2)SO_(4) liberating ul(" (v) ") gas.
Read the given passage carefully and fill in the blanks by selecting an appropriate option. Oxides of ul(" (i) ") are reduced to their respective metals by heating with coke and the process is called ul(" (ii) ") . Before carrying out reduction with carbon, if the calcined or roasted ore still contains infusible impurities of earthy matter, called ul(" (iii) ") , an additional substance, called ul(" (iv) ") is added which combines with (iii) to form a fusible material, called ul(" (v) ") .
Read the given passage and fill in the blanks by choosing an appropriate option. Metals have high densities except (i)__ which can even float on water. Metals are malleable and ductile (ii)___ are the most malleable and ductile metals. All metals conduct heat and electricity. (iii)___ is the best conductor while (iv)___ is a poor conductor.
Read the given passage and fill in the blanks by selecting an appropriate option . The head of the matchstick contains __i_ and (ii)___while the rubbing surface contains (iii)_____ and (iv)____. When matchstick is rubbed on the surface, some of the (v)_______gets converted into (vi)______ due to the heat generated by friction.
SCIENCE OLYMPIAD FOUNDATION -SYNTHETIC FIBRES AND PLASTICS-ACHIEVERS SECTION (HOTS)
