Which of these is a mixture of elements?
a. silver and gold
b. carbon dioxide
c. salt and pepper
d. all of these are mixtures of elements.

-- Carbon dioxide is a compound of two elements.

-- Salt is a compound.
Pepper is a mixture of compounds.
Salt and pepper together in a shaker is a mixture of more compounds.

-- Silver is an element.
Gold is an element.
Silver and gold together in a shaker is a mixture of elements.

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