Basic General Knowledge
The exhaled air contains

carbon dioxide only
a mixture of carbon dioxide and nitrogen
a mixture which has more carbon dioxide than oxygen
a mixture of carbon dioxide, nitrogen and oxygen in which nitrogen has the highest percentage

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Basic General Knowledge
Free market is

None of these
market where the price of a commodity is determined by free play of the forces of supply and demand
ports that are exempted from payment of customs duty on articles of commerce, primarily to encourage tourism
a condition in the international market where nations do not impose customs duty or other taxes on import of goods

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