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Question

Identify the correct statements from the following:
(a) CO2 (g) is used as refrigerant for ice-cream and frozen food.
(b) The structure of C60 contains twelve six carbon rings and twenty five carbon rings.
(c) ZSM-5, a type of zeolite, is used to convert alcohols into gasoline.
(d) CO is colourless and odourless gas.

A
(c) and (d) only
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B
(a) and (c) only
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C
(a) , (b) and (c) only
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D
(b) and (c) only
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Solution

The correct option is A (c) and (d) only
(a) CO2 in solid state used as refrigerant for ice-cream and frozen food because of its sublimation properties. Sublimation is a process in which a solid directly goes into gaseous state without going into liquid state.
(b) The structure ofC60 contains twelve five-carbon rings and twenty six-carbon rings. Hence the given statement is wrong.
(c) ZSM-5, a type of zeolite , is used to convert alcohols into gasoline
(d) CO is colourless & odourless gas

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